--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/lang/AbstractStringBuilder.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,1417 @@
+/*
+ * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.lang;
+
+import sun.misc.FloatingDecimal;
+import java.util.Arrays;
+
+/**
+ * A mutable sequence of characters.
+ * <p>
+ * Implements a modifiable string. At any point in time it contains some
+ * particular sequence of characters, but the length and content of the
+ * sequence can be changed through certain method calls.
+ *
+ * @author Michael McCloskey
+ * @since 1.5
+ */
+abstract class AbstractStringBuilder implements Appendable, CharSequence {
+ /**
+ * The value is used for character storage.
+ */
+ char value[];
+
+ /**
+ * The count is the number of characters used.
+ */
+ int count;
+
+ /**
+ * This no-arg constructor is necessary for serialization of subclasses.
+ */
+ AbstractStringBuilder() {
+ }
+
+ /**
+ * Creates an AbstractStringBuilder of the specified capacity.
+ */
+ AbstractStringBuilder(int capacity) {
+ value = new char[capacity];
+ }
+
+ /**
+ * Returns the length (character count).
+ *
+ * @return the length of the sequence of characters currently
+ * represented by this object
+ */
+ public int length() {
+ return count;
+ }
+
+ /**
+ * Returns the current capacity. The capacity is the amount of storage
+ * available for newly inserted characters, beyond which an allocation
+ * will occur.
+ *
+ * @return the current capacity
+ */
+ public int capacity() {
+ return value.length;
+ }
+
+ /**
+ * Ensures that the capacity is at least equal to the specified minimum.
+ * If the current capacity is less than the argument, then a new internal
+ * array is allocated with greater capacity. The new capacity is the
+ * larger of:
+ * <ul>
+ * <li>The <code>minimumCapacity</code> argument.
+ * <li>Twice the old capacity, plus <code>2</code>.
+ * </ul>
+ * If the <code>minimumCapacity</code> argument is nonpositive, this
+ * method takes no action and simply returns.
+ *
+ * @param minimumCapacity the minimum desired capacity.
+ */
+ public void ensureCapacity(int minimumCapacity) {
+ if (minimumCapacity > value.length) {
+ expandCapacity(minimumCapacity);
+ }
+ }
+
+ /**
+ * This implements the expansion semantics of ensureCapacity with no
+ * size check or synchronization.
+ */
+ void expandCapacity(int minimumCapacity) {
+ int newCapacity = (value.length + 1) * 2;
+ if (newCapacity < 0) {
+ newCapacity = Integer.MAX_VALUE;
+ } else if (minimumCapacity > newCapacity) {
+ newCapacity = minimumCapacity;
+ }
+ value = Arrays.copyOf(value, newCapacity);
+ }
+
+ /**
+ * Attempts to reduce storage used for the character sequence.
+ * If the buffer is larger than necessary to hold its current sequence of
+ * characters, then it may be resized to become more space efficient.
+ * Calling this method may, but is not required to, affect the value
+ * returned by a subsequent call to the {@link #capacity()} method.
+ */
+ public void trimToSize() {
+ if (count < value.length) {
+ value = Arrays.copyOf(value, count);
+ }
+ }
+
+ /**
+ * Sets the length of the character sequence.
+ * The sequence is changed to a new character sequence
+ * whose length is specified by the argument. For every nonnegative
+ * index <i>k</i> less than <code>newLength</code>, the character at
+ * index <i>k</i> in the new character sequence is the same as the
+ * character at index <i>k</i> in the old sequence if <i>k</i> is less
+ * than the length of the old character sequence; otherwise, it is the
+ * null character <code>'\u0000'</code>.
+ *
+ * In other words, if the <code>newLength</code> argument is less than
+ * the current length, the length is changed to the specified length.
+ * <p>
+ * If the <code>newLength</code> argument is greater than or equal
+ * to the current length, sufficient null characters
+ * (<code>'\u0000'</code>) are appended so that
+ * length becomes the <code>newLength</code> argument.
+ * <p>
+ * The <code>newLength</code> argument must be greater than or equal
+ * to <code>0</code>.
+ *
+ * @param newLength the new length
+ * @throws IndexOutOfBoundsException if the
+ * <code>newLength</code> argument is negative.
+ */
+ public void setLength(int newLength) {
+ if (newLength < 0)
+ throw new StringIndexOutOfBoundsException(newLength);
+ if (newLength > value.length)
+ expandCapacity(newLength);
+
+ if (count < newLength) {
+ for (; count < newLength; count++)
+ value[count] = '\0';
+ } else {
+ count = newLength;
+ }
+ }
+
+ /**
+ * Returns the <code>char</code> value in this sequence at the specified index.
+ * The first <code>char</code> value is at index <code>0</code>, the next at index
+ * <code>1</code>, and so on, as in array indexing.
+ * <p>
+ * The index argument must be greater than or equal to
+ * <code>0</code>, and less than the length of this sequence.
+ *
+ * <p>If the <code>char</code> value specified by the index is a
+ * <a href="Character.html#unicode">surrogate</a>, the surrogate
+ * value is returned.
+ *
+ * @param index the index of the desired <code>char</code> value.
+ * @return the <code>char</code> value at the specified index.
+ * @throws IndexOutOfBoundsException if <code>index</code> is
+ * negative or greater than or equal to <code>length()</code>.
+ */
+ public char charAt(int index) {
+ if ((index < 0) || (index >= count))
+ throw new StringIndexOutOfBoundsException(index);
+ return value[index];
+ }
+
+ /**
+ * Returns the character (Unicode code point) at the specified
+ * index. The index refers to <code>char</code> values
+ * (Unicode code units) and ranges from <code>0</code> to
+ * {@link #length()}<code> - 1</code>.
+ *
+ * <p> If the <code>char</code> value specified at the given index
+ * is in the high-surrogate range, the following index is less
+ * than the length of this sequence, and the
+ * <code>char</code> value at the following index is in the
+ * low-surrogate range, then the supplementary code point
+ * corresponding to this surrogate pair is returned. Otherwise,
+ * the <code>char</code> value at the given index is returned.
+ *
+ * @param index the index to the <code>char</code> values
+ * @return the code point value of the character at the
+ * <code>index</code>
+ * @exception IndexOutOfBoundsException if the <code>index</code>
+ * argument is negative or not less than the length of this
+ * sequence.
+ */
+ public int codePointAt(int index) {
+ if ((index < 0) || (index >= count)) {
+ throw new StringIndexOutOfBoundsException(index);
+ }
+ return Character.codePointAt(value, index);
+ }
+
+ /**
+ * Returns the character (Unicode code point) before the specified
+ * index. The index refers to <code>char</code> values
+ * (Unicode code units) and ranges from <code>1</code> to {@link
+ * #length()}.
+ *
+ * <p> If the <code>char</code> value at <code>(index - 1)</code>
+ * is in the low-surrogate range, <code>(index - 2)</code> is not
+ * negative, and the <code>char</code> value at <code>(index -
+ * 2)</code> is in the high-surrogate range, then the
+ * supplementary code point value of the surrogate pair is
+ * returned. If the <code>char</code> value at <code>index -
+ * 1</code> is an unpaired low-surrogate or a high-surrogate, the
+ * surrogate value is returned.
+ *
+ * @param index the index following the code point that should be returned
+ * @return the Unicode code point value before the given index.
+ * @exception IndexOutOfBoundsException if the <code>index</code>
+ * argument is less than 1 or greater than the length
+ * of this sequence.
+ */
+ public int codePointBefore(int index) {
+ int i = index - 1;
+ if ((i < 0) || (i >= count)) {
+ throw new StringIndexOutOfBoundsException(index);
+ }
+ return Character.codePointBefore(value, index);
+ }
+
+ /**
+ * Returns the number of Unicode code points in the specified text
+ * range of this sequence. The text range begins at the specified
+ * <code>beginIndex</code> and extends to the <code>char</code> at
+ * index <code>endIndex - 1</code>. Thus the length (in
+ * <code>char</code>s) of the text range is
+ * <code>endIndex-beginIndex</code>. Unpaired surrogates within
+ * this sequence count as one code point each.
+ *
+ * @param beginIndex the index to the first <code>char</code> of
+ * the text range.
+ * @param endIndex the index after the last <code>char</code> of
+ * the text range.
+ * @return the number of Unicode code points in the specified text
+ * range
+ * @exception IndexOutOfBoundsException if the
+ * <code>beginIndex</code> is negative, or <code>endIndex</code>
+ * is larger than the length of this sequence, or
+ * <code>beginIndex</code> is larger than <code>endIndex</code>.
+ */
+ public int codePointCount(int beginIndex, int endIndex) {
+ if (beginIndex < 0 || endIndex > count || beginIndex > endIndex) {
+ throw new IndexOutOfBoundsException();
+ }
+ return Character.codePointCountImpl(value, beginIndex, endIndex-beginIndex);
+ }
+
+ /**
+ * Returns the index within this sequence that is offset from the
+ * given <code>index</code> by <code>codePointOffset</code> code
+ * points. Unpaired surrogates within the text range given by
+ * <code>index</code> and <code>codePointOffset</code> count as
+ * one code point each.
+ *
+ * @param index the index to be offset
+ * @param codePointOffset the offset in code points
+ * @return the index within this sequence
+ * @exception IndexOutOfBoundsException if <code>index</code>
+ * is negative or larger then the length of this sequence,
+ * or if <code>codePointOffset</code> is positive and the subsequence
+ * starting with <code>index</code> has fewer than
+ * <code>codePointOffset</code> code points,
+ * or if <code>codePointOffset</code> is negative and the subsequence
+ * before <code>index</code> has fewer than the absolute value of
+ * <code>codePointOffset</code> code points.
+ */
+ public int offsetByCodePoints(int index, int codePointOffset) {
+ if (index < 0 || index > count) {
+ throw new IndexOutOfBoundsException();
+ }
+ return Character.offsetByCodePointsImpl(value, 0, count,
+ index, codePointOffset);
+ }
+
+ /**
+ * Characters are copied from this sequence into the
+ * destination character array <code>dst</code>. The first character to
+ * be copied is at index <code>srcBegin</code>; the last character to
+ * be copied is at index <code>srcEnd-1</code>. The total number of
+ * characters to be copied is <code>srcEnd-srcBegin</code>. The
+ * characters are copied into the subarray of <code>dst</code> starting
+ * at index <code>dstBegin</code> and ending at index:
+ * <p><blockquote><pre>
+ * dstbegin + (srcEnd-srcBegin) - 1
+ * </pre></blockquote>
+ *
+ * @param srcBegin start copying at this offset.
+ * @param srcEnd stop copying at this offset.
+ * @param dst the array to copy the data into.
+ * @param dstBegin offset into <code>dst</code>.
+ * @throws NullPointerException if <code>dst</code> is
+ * <code>null</code>.
+ * @throws IndexOutOfBoundsException if any of the following is true:
+ * <ul>
+ * <li><code>srcBegin</code> is negative
+ * <li><code>dstBegin</code> is negative
+ * <li>the <code>srcBegin</code> argument is greater than
+ * the <code>srcEnd</code> argument.
+ * <li><code>srcEnd</code> is greater than
+ * <code>this.length()</code>.
+ * <li><code>dstBegin+srcEnd-srcBegin</code> is greater than
+ * <code>dst.length</code>
+ * </ul>
+ */
+ public void getChars(int srcBegin, int srcEnd, char dst[],
+ int dstBegin)
+ {
+ if (srcBegin < 0)
+ throw new StringIndexOutOfBoundsException(srcBegin);
+ if ((srcEnd < 0) || (srcEnd > count))
+ throw new StringIndexOutOfBoundsException(srcEnd);
+ if (srcBegin > srcEnd)
+ throw new StringIndexOutOfBoundsException("srcBegin > srcEnd");
+ System.arraycopy(value, srcBegin, dst, dstBegin, srcEnd - srcBegin);
+ }
+
+ /**
+ * The character at the specified index is set to <code>ch</code>. This
+ * sequence is altered to represent a new character sequence that is
+ * identical to the old character sequence, except that it contains the
+ * character <code>ch</code> at position <code>index</code>.
+ * <p>
+ * The index argument must be greater than or equal to
+ * <code>0</code>, and less than the length of this sequence.
+ *
+ * @param index the index of the character to modify.
+ * @param ch the new character.
+ * @throws IndexOutOfBoundsException if <code>index</code> is
+ * negative or greater than or equal to <code>length()</code>.
+ */
+ public void setCharAt(int index, char ch) {
+ if ((index < 0) || (index >= count))
+ throw new StringIndexOutOfBoundsException(index);
+ value[index] = ch;
+ }
+
+ /**
+ * Appends the string representation of the <code>Object</code>
+ * argument.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this sequence.
+ *
+ * @param obj an <code>Object</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(Object obj) {
+ return append(String.valueOf(obj));
+ }
+
+ /**
+ * Appends the specified string to this character sequence.
+ * <p>
+ * The characters of the <code>String</code> argument are appended, in
+ * order, increasing the length of this sequence by the length of the
+ * argument. If <code>str</code> is <code>null</code>, then the four
+ * characters <code>"null"</code> are appended.
+ * <p>
+ * Let <i>n</i> be the length of this character sequence just prior to
+ * execution of the <code>append</code> method. Then the character at
+ * index <i>k</i> in the new character sequence is equal to the character
+ * at index <i>k</i> in the old character sequence, if <i>k</i> is less
+ * than <i>n</i>; otherwise, it is equal to the character at index
+ * <i>k-n</i> in the argument <code>str</code>.
+ *
+ * @param str a string.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(String str) {
+ if (str == null) str = "null";
+ int len = str.length();
+ if (len == 0) return this;
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ str.getChars(0, len, value, count);
+ count = newCount;
+ return this;
+ }
+
+ // Documentation in subclasses because of synchro difference
+ public AbstractStringBuilder append(StringBuffer sb) {
+ if (sb == null)
+ return append("null");
+ int len = sb.length();
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ sb.getChars(0, len, value, count);
+ count = newCount;
+ return this;
+ }
+
+ // Documentation in subclasses because of synchro difference
+ public AbstractStringBuilder append(CharSequence s) {
+ if (s == null)
+ s = "null";
+ if (s instanceof String)
+ return this.append((String)s);
+ if (s instanceof StringBuffer)
+ return this.append((StringBuffer)s);
+ return this.append(s, 0, s.length());
+ }
+
+ /**
+ * Appends a subsequence of the specified <code>CharSequence</code> to this
+ * sequence.
+ * <p>
+ * Characters of the argument <code>s</code>, starting at
+ * index <code>start</code>, are appended, in order, to the contents of
+ * this sequence up to the (exclusive) index <code>end</code>. The length
+ * of this sequence is increased by the value of <code>end - start</code>.
+ * <p>
+ * Let <i>n</i> be the length of this character sequence just prior to
+ * execution of the <code>append</code> method. Then the character at
+ * index <i>k</i> in this character sequence becomes equal to the
+ * character at index <i>k</i> in this sequence, if <i>k</i> is less than
+ * <i>n</i>; otherwise, it is equal to the character at index
+ * <i>k+start-n</i> in the argument <code>s</code>.
+ * <p>
+ * If <code>s</code> is <code>null</code>, then this method appends
+ * characters as if the s parameter was a sequence containing the four
+ * characters <code>"null"</code>.
+ *
+ * @param s the sequence to append.
+ * @param start the starting index of the subsequence to be appended.
+ * @param end the end index of the subsequence to be appended.
+ * @return a reference to this object.
+ * @throws IndexOutOfBoundsException if
+ * <code>start</code> or <code>end</code> are negative, or
+ * <code>start</code> is greater than <code>end</code> or
+ * <code>end</code> is greater than <code>s.length()</code>
+ */
+ public AbstractStringBuilder append(CharSequence s, int start, int end) {
+ if (s == null)
+ s = "null";
+ if ((start < 0) || (end < 0) || (start > end) || (end > s.length()))
+ throw new IndexOutOfBoundsException(
+ "start " + start + ", end " + end + ", s.length() "
+ + s.length());
+ int len = end - start;
+ if (len == 0)
+ return this;
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ for (int i=start; i<end; i++)
+ value[count++] = s.charAt(i);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>char</code> array
+ * argument to this sequence.
+ * <p>
+ * The characters of the array argument are appended, in order, to
+ * the contents of this sequence. The length of this sequence
+ * increases by the length of the argument.
+ * <p>
+ * The overall effect is exactly as if the argument were converted to
+ * a string by the method {@link String#valueOf(char[])} and the
+ * characters of that string were then {@link #append(String) appended}
+ * to this character sequence.
+ *
+ * @param str the characters to be appended.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(char str[]) {
+ int newCount = count + str.length;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(str, 0, value, count, str.length);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of a subarray of the
+ * <code>char</code> array argument to this sequence.
+ * <p>
+ * Characters of the <code>char</code> array <code>str</code>, starting at
+ * index <code>offset</code>, are appended, in order, to the contents
+ * of this sequence. The length of this sequence increases
+ * by the value of <code>len</code>.
+ * <p>
+ * The overall effect is exactly as if the arguments were converted to
+ * a string by the method {@link String#valueOf(char[],int,int)} and the
+ * characters of that string were then {@link #append(String) appended}
+ * to this character sequence.
+ *
+ * @param str the characters to be appended.
+ * @param offset the index of the first <code>char</code> to append.
+ * @param len the number of <code>char</code>s to append.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(char str[], int offset, int len) {
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(str, offset, value, count, len);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>boolean</code>
+ * argument to the sequence.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this sequence.
+ *
+ * @param b a <code>boolean</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(boolean b) {
+ if (b) {
+ int newCount = count + 4;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ value[count++] = 't';
+ value[count++] = 'r';
+ value[count++] = 'u';
+ value[count++] = 'e';
+ } else {
+ int newCount = count + 5;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ value[count++] = 'f';
+ value[count++] = 'a';
+ value[count++] = 'l';
+ value[count++] = 's';
+ value[count++] = 'e';
+ }
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>char</code>
+ * argument to this sequence.
+ * <p>
+ * The argument is appended to the contents of this sequence.
+ * The length of this sequence increases by <code>1</code>.
+ * <p>
+ * The overall effect is exactly as if the argument were converted to
+ * a string by the method {@link String#valueOf(char)} and the character
+ * in that string were then {@link #append(String) appended} to this
+ * character sequence.
+ *
+ * @param c a <code>char</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(char c) {
+ int newCount = count + 1;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ value[count++] = c;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>int</code>
+ * argument to this sequence.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this sequence.
+ *
+ * @param i an <code>int</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(int i) {
+ if (i == Integer.MIN_VALUE) {
+ append("-2147483648");
+ return this;
+ }
+ int appendedLength = (i < 0) ? Integer.stringSize(-i) + 1
+ : Integer.stringSize(i);
+ int spaceNeeded = count + appendedLength;
+ if (spaceNeeded > value.length)
+ expandCapacity(spaceNeeded);
+ Integer.getChars(i, spaceNeeded, value);
+ count = spaceNeeded;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>long</code>
+ * argument to this sequence.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this sequence.
+ *
+ * @param l a <code>long</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(long l) {
+ if (l == Long.MIN_VALUE) {
+ append("-9223372036854775808");
+ return this;
+ }
+ int appendedLength = (l < 0) ? Long.stringSize(-l) + 1
+ : Long.stringSize(l);
+ int spaceNeeded = count + appendedLength;
+ if (spaceNeeded > value.length)
+ expandCapacity(spaceNeeded);
+ Long.getChars(l, spaceNeeded, value);
+ count = spaceNeeded;
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>float</code>
+ * argument to this sequence.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this string sequence.
+ *
+ * @param f a <code>float</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(float f) {
+ new FloatingDecimal(f).appendTo(this);
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>double</code>
+ * argument to this sequence.
+ * <p>
+ * The argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then appended to this sequence.
+ *
+ * @param d a <code>double</code>.
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder append(double d) {
+ new FloatingDecimal(d).appendTo(this);
+ return this;
+ }
+
+ /**
+ * Removes the characters in a substring of this sequence.
+ * The substring begins at the specified <code>start</code> and extends to
+ * the character at index <code>end - 1</code> or to the end of the
+ * sequence if no such character exists. If
+ * <code>start</code> is equal to <code>end</code>, no changes are made.
+ *
+ * @param start The beginning index, inclusive.
+ * @param end The ending index, exclusive.
+ * @return This object.
+ * @throws StringIndexOutOfBoundsException if <code>start</code>
+ * is negative, greater than <code>length()</code>, or
+ * greater than <code>end</code>.
+ */
+ public AbstractStringBuilder delete(int start, int end) {
+ if (start < 0)
+ throw new StringIndexOutOfBoundsException(start);
+ if (end > count)
+ end = count;
+ if (start > end)
+ throw new StringIndexOutOfBoundsException();
+ int len = end - start;
+ if (len > 0) {
+ System.arraycopy(value, start+len, value, start, count-end);
+ count -= len;
+ }
+ return this;
+ }
+
+ /**
+ * Appends the string representation of the <code>codePoint</code>
+ * argument to this sequence.
+ *
+ * <p> The argument is appended to the contents of this sequence.
+ * The length of this sequence increases by
+ * {@link Character#charCount(int) Character.charCount(codePoint)}.
+ *
+ * <p> The overall effect is exactly as if the argument were
+ * converted to a <code>char</code> array by the method {@link
+ * Character#toChars(int)} and the character in that array were
+ * then {@link #append(char[]) appended} to this character
+ * sequence.
+ *
+ * @param codePoint a Unicode code point
+ * @return a reference to this object.
+ * @exception IllegalArgumentException if the specified
+ * <code>codePoint</code> isn't a valid Unicode code point
+ */
+ public AbstractStringBuilder appendCodePoint(int codePoint) {
+ if (!Character.isValidCodePoint(codePoint)) {
+ throw new IllegalArgumentException();
+ }
+ int n = 1;
+ if (codePoint >= Character.MIN_SUPPLEMENTARY_CODE_POINT) {
+ n++;
+ }
+ int newCount = count + n;
+ if (newCount > value.length) {
+ expandCapacity(newCount);
+ }
+ if (n == 1) {
+ value[count++] = (char) codePoint;
+ } else {
+ Character.toSurrogates(codePoint, value, count);
+ count += n;
+ }
+ return this;
+ }
+
+ /**
+ * Removes the <code>char</code> at the specified position in this
+ * sequence. This sequence is shortened by one <code>char</code>.
+ *
+ * <p>Note: If the character at the given index is a supplementary
+ * character, this method does not remove the entire character. If
+ * correct handling of supplementary characters is required,
+ * determine the number of <code>char</code>s to remove by calling
+ * <code>Character.charCount(thisSequence.codePointAt(index))</code>,
+ * where <code>thisSequence</code> is this sequence.
+ *
+ * @param index Index of <code>char</code> to remove
+ * @return This object.
+ * @throws StringIndexOutOfBoundsException if the <code>index</code>
+ * is negative or greater than or equal to
+ * <code>length()</code>.
+ */
+ public AbstractStringBuilder deleteCharAt(int index) {
+ if ((index < 0) || (index >= count))
+ throw new StringIndexOutOfBoundsException(index);
+ System.arraycopy(value, index+1, value, index, count-index-1);
+ count--;
+ return this;
+ }
+
+ /**
+ * Replaces the characters in a substring of this sequence
+ * with characters in the specified <code>String</code>. The substring
+ * begins at the specified <code>start</code> and extends to the character
+ * at index <code>end - 1</code> or to the end of the
+ * sequence if no such character exists. First the
+ * characters in the substring are removed and then the specified
+ * <code>String</code> is inserted at <code>start</code>. (This
+ * sequence will be lengthened to accommodate the
+ * specified String if necessary.)
+ *
+ * @param start The beginning index, inclusive.
+ * @param end The ending index, exclusive.
+ * @param str String that will replace previous contents.
+ * @return This object.
+ * @throws StringIndexOutOfBoundsException if <code>start</code>
+ * is negative, greater than <code>length()</code>, or
+ * greater than <code>end</code>.
+ */
+ public AbstractStringBuilder replace(int start, int end, String str) {
+ if (start < 0)
+ throw new StringIndexOutOfBoundsException(start);
+ if (start > count)
+ throw new StringIndexOutOfBoundsException("start > length()");
+ if (start > end)
+ throw new StringIndexOutOfBoundsException("start > end");
+
+ if (end > count)
+ end = count;
+ int len = str.length();
+ int newCount = count + len - (end - start);
+ if (newCount > value.length)
+ expandCapacity(newCount);
+
+ System.arraycopy(value, end, value, start + len, count - end);
+ str.getChars(value, start);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Returns a new <code>String</code> that contains a subsequence of
+ * characters currently contained in this character sequence. The
+ * substring begins at the specified index and extends to the end of
+ * this sequence.
+ *
+ * @param start The beginning index, inclusive.
+ * @return The new string.
+ * @throws StringIndexOutOfBoundsException if <code>start</code> is
+ * less than zero, or greater than the length of this object.
+ */
+ public String substring(int start) {
+ return substring(start, count);
+ }
+
+ /**
+ * Returns a new character sequence that is a subsequence of this sequence.
+ *
+ * <p> An invocation of this method of the form
+ *
+ * <blockquote><pre>
+ * sb.subSequence(begin, end)</pre></blockquote>
+ *
+ * behaves in exactly the same way as the invocation
+ *
+ * <blockquote><pre>
+ * sb.substring(begin, end)</pre></blockquote>
+ *
+ * This method is provided so that this class can
+ * implement the {@link CharSequence} interface. </p>
+ *
+ * @param start the start index, inclusive.
+ * @param end the end index, exclusive.
+ * @return the specified subsequence.
+ *
+ * @throws IndexOutOfBoundsException
+ * if <tt>start</tt> or <tt>end</tt> are negative,
+ * if <tt>end</tt> is greater than <tt>length()</tt>,
+ * or if <tt>start</tt> is greater than <tt>end</tt>
+ * @spec JSR-51
+ */
+ public CharSequence subSequence(int start, int end) {
+ return substring(start, end);
+ }
+
+ /**
+ * Returns a new <code>String</code> that contains a subsequence of
+ * characters currently contained in this sequence. The
+ * substring begins at the specified <code>start</code> and
+ * extends to the character at index <code>end - 1</code>.
+ *
+ * @param start The beginning index, inclusive.
+ * @param end The ending index, exclusive.
+ * @return The new string.
+ * @throws StringIndexOutOfBoundsException if <code>start</code>
+ * or <code>end</code> are negative or greater than
+ * <code>length()</code>, or <code>start</code> is
+ * greater than <code>end</code>.
+ */
+ public String substring(int start, int end) {
+ if (start < 0)
+ throw new StringIndexOutOfBoundsException(start);
+ if (end > count)
+ throw new StringIndexOutOfBoundsException(end);
+ if (start > end)
+ throw new StringIndexOutOfBoundsException(end - start);
+ return new String(value, start, end - start);
+ }
+
+ /**
+ * Inserts the string representation of a subarray of the <code>str</code>
+ * array argument into this sequence. The subarray begins at the
+ * specified <code>offset</code> and extends <code>len</code> <code>char</code>s.
+ * The characters of the subarray are inserted into this sequence at
+ * the position indicated by <code>index</code>. The length of this
+ * sequence increases by <code>len</code> <code>char</code>s.
+ *
+ * @param index position at which to insert subarray.
+ * @param str A <code>char</code> array.
+ * @param offset the index of the first <code>char</code> in subarray to
+ * be inserted.
+ * @param len the number of <code>char</code>s in the subarray to
+ * be inserted.
+ * @return This object
+ * @throws StringIndexOutOfBoundsException if <code>index</code>
+ * is negative or greater than <code>length()</code>, or
+ * <code>offset</code> or <code>len</code> are negative, or
+ * <code>(offset+len)</code> is greater than
+ * <code>str.length</code>.
+ */
+ public AbstractStringBuilder insert(int index, char str[], int offset,
+ int len)
+ {
+ if ((index < 0) || (index > length()))
+ throw new StringIndexOutOfBoundsException(index);
+ if ((offset < 0) || (len < 0) || (offset > str.length - len))
+ throw new StringIndexOutOfBoundsException(
+ "offset " + offset + ", len " + len + ", str.length "
+ + str.length);
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(value, index, value, index + len, count - index);
+ System.arraycopy(str, offset, value, index, len);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Inserts the string representation of the <code>Object</code>
+ * argument into this character sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the indicated
+ * offset.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param obj an <code>Object</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, Object obj) {
+ return insert(offset, String.valueOf(obj));
+ }
+
+ /**
+ * Inserts the string into this character sequence.
+ * <p>
+ * The characters of the <code>String</code> argument are inserted, in
+ * order, into this sequence at the indicated offset, moving up any
+ * characters originally above that position and increasing the length
+ * of this sequence by the length of the argument. If
+ * <code>str</code> is <code>null</code>, then the four characters
+ * <code>"null"</code> are inserted into this sequence.
+ * <p>
+ * The character at index <i>k</i> in the new character sequence is
+ * equal to:
+ * <ul>
+ * <li>the character at index <i>k</i> in the old character sequence, if
+ * <i>k</i> is less than <code>offset</code>
+ * <li>the character at index <i>k</i><code>-offset</code> in the
+ * argument <code>str</code>, if <i>k</i> is not less than
+ * <code>offset</code> but is less than <code>offset+str.length()</code>
+ * <li>the character at index <i>k</i><code>-str.length()</code> in the
+ * old character sequence, if <i>k</i> is not less than
+ * <code>offset+str.length()</code>
+ * </ul><p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param str a string.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, String str) {
+ if ((offset < 0) || (offset > length()))
+ throw new StringIndexOutOfBoundsException(offset);
+ if (str == null)
+ str = "null";
+ int len = str.length();
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(value, offset, value, offset + len, count - offset);
+ str.getChars(value, offset);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Inserts the string representation of the <code>char</code> array
+ * argument into this sequence.
+ * <p>
+ * The characters of the array argument are inserted into the
+ * contents of this sequence at the position indicated by
+ * <code>offset</code>. The length of this sequence increases by
+ * the length of the argument.
+ * <p>
+ * The overall effect is exactly as if the argument were converted to
+ * a string by the method {@link String#valueOf(char[])} and the
+ * characters of that string were then
+ * {@link #insert(int,String) inserted} into this
+ * character sequence at the position indicated by
+ * <code>offset</code>.
+ *
+ * @param offset the offset.
+ * @param str a character array.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, char str[]) {
+ if ((offset < 0) || (offset > length()))
+ throw new StringIndexOutOfBoundsException(offset);
+ int len = str.length;
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(value, offset, value, offset + len, count - offset);
+ System.arraycopy(str, 0, value, offset, len);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Inserts the specified <code>CharSequence</code> into this sequence.
+ * <p>
+ * The characters of the <code>CharSequence</code> argument are inserted,
+ * in order, into this sequence at the indicated offset, moving up
+ * any characters originally above that position and increasing the length
+ * of this sequence by the length of the argument s.
+ * <p>
+ * The result of this method is exactly the same as if it were an
+ * invocation of this object's insert(dstOffset, s, 0, s.length()) method.
+ *
+ * <p>If <code>s</code> is <code>null</code>, then the four characters
+ * <code>"null"</code> are inserted into this sequence.
+ *
+ * @param dstOffset the offset.
+ * @param s the sequence to be inserted
+ * @return a reference to this object.
+ * @throws IndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int dstOffset, CharSequence s) {
+ if (s == null)
+ s = "null";
+ if (s instanceof String)
+ return this.insert(dstOffset, (String)s);
+ return this.insert(dstOffset, s, 0, s.length());
+ }
+
+ /**
+ * Inserts a subsequence of the specified <code>CharSequence</code> into
+ * this sequence.
+ * <p>
+ * The subsequence of the argument <code>s</code> specified by
+ * <code>start</code> and <code>end</code> are inserted,
+ * in order, into this sequence at the specified destination offset, moving
+ * up any characters originally above that position. The length of this
+ * sequence is increased by <code>end - start</code>.
+ * <p>
+ * The character at index <i>k</i> in this sequence becomes equal to:
+ * <ul>
+ * <li>the character at index <i>k</i> in this sequence, if
+ * <i>k</i> is less than <code>dstOffset</code>
+ * <li>the character at index <i>k</i><code>+start-dstOffset</code> in
+ * the argument <code>s</code>, if <i>k</i> is greater than or equal to
+ * <code>dstOffset</code> but is less than <code>dstOffset+end-start</code>
+ * <li>the character at index <i>k</i><code>-(end-start)</code> in this
+ * sequence, if <i>k</i> is greater than or equal to
+ * <code>dstOffset+end-start</code>
+ * </ul><p>
+ * The dstOffset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ * <p>The start argument must be nonnegative, and not greater than
+ * <code>end</code>.
+ * <p>The end argument must be greater than or equal to
+ * <code>start</code>, and less than or equal to the length of s.
+ *
+ * <p>If <code>s</code> is <code>null</code>, then this method inserts
+ * characters as if the s parameter was a sequence containing the four
+ * characters <code>"null"</code>.
+ *
+ * @param dstOffset the offset in this sequence.
+ * @param s the sequence to be inserted.
+ * @param start the starting index of the subsequence to be inserted.
+ * @param end the end index of the subsequence to be inserted.
+ * @return a reference to this object.
+ * @throws IndexOutOfBoundsException if <code>dstOffset</code>
+ * is negative or greater than <code>this.length()</code>, or
+ * <code>start</code> or <code>end</code> are negative, or
+ * <code>start</code> is greater than <code>end</code> or
+ * <code>end</code> is greater than <code>s.length()</code>
+ */
+ public AbstractStringBuilder insert(int dstOffset, CharSequence s,
+ int start, int end) {
+ if (s == null)
+ s = "null";
+ if ((dstOffset < 0) || (dstOffset > this.length()))
+ throw new IndexOutOfBoundsException("dstOffset "+dstOffset);
+ if ((start < 0) || (end < 0) || (start > end) || (end > s.length()))
+ throw new IndexOutOfBoundsException(
+ "start " + start + ", end " + end + ", s.length() "
+ + s.length());
+ int len = end - start;
+ if (len == 0)
+ return this;
+ int newCount = count + len;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(value, dstOffset, value, dstOffset + len,
+ count - dstOffset);
+ for (int i=start; i<end; i++)
+ value[dstOffset++] = s.charAt(i);
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Inserts the string representation of the <code>boolean</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the indicated
+ * offset.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param b a <code>boolean</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, boolean b) {
+ return insert(offset, String.valueOf(b));
+ }
+
+ /**
+ * Inserts the string representation of the <code>char</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is inserted into the contents of this sequence
+ * at the position indicated by <code>offset</code>. The length
+ * of this sequence increases by one.
+ * <p>
+ * The overall effect is exactly as if the argument were converted to
+ * a string by the method {@link String#valueOf(char)} and the character
+ * in that string were then {@link #insert(int, String) inserted} into
+ * this character sequence at the position indicated by
+ * <code>offset</code>.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param c a <code>char</code>.
+ * @return a reference to this object.
+ * @throws IndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, char c) {
+ int newCount = count + 1;
+ if (newCount > value.length)
+ expandCapacity(newCount);
+ System.arraycopy(value, offset, value, offset + 1, count - offset);
+ value[offset] = c;
+ count = newCount;
+ return this;
+ }
+
+ /**
+ * Inserts the string representation of the second <code>int</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the indicated
+ * offset.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param i an <code>int</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, int i) {
+ return insert(offset, String.valueOf(i));
+ }
+
+ /**
+ * Inserts the string representation of the <code>long</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the position
+ * indicated by <code>offset</code>.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param l a <code>long</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, long l) {
+ return insert(offset, String.valueOf(l));
+ }
+
+ /**
+ * Inserts the string representation of the <code>float</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the indicated
+ * offset.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param f a <code>float</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, float f) {
+ return insert(offset, String.valueOf(f));
+ }
+
+ /**
+ * Inserts the string representation of the <code>double</code>
+ * argument into this sequence.
+ * <p>
+ * The second argument is converted to a string as if by the method
+ * <code>String.valueOf</code>, and the characters of that
+ * string are then inserted into this sequence at the indicated
+ * offset.
+ * <p>
+ * The offset argument must be greater than or equal to
+ * <code>0</code>, and less than or equal to the length of this
+ * sequence.
+ *
+ * @param offset the offset.
+ * @param d a <code>double</code>.
+ * @return a reference to this object.
+ * @throws StringIndexOutOfBoundsException if the offset is invalid.
+ */
+ public AbstractStringBuilder insert(int offset, double d) {
+ return insert(offset, String.valueOf(d));
+ }
+
+ /**
+ * Returns the index within this string of the first occurrence of the
+ * specified substring. The integer returned is the smallest value
+ * <i>k</i> such that:
+ * <blockquote><pre>
+ * this.toString().startsWith(str, <i>k</i>)
+ * </pre></blockquote>
+ * is <code>true</code>.
+ *
+ * @param str any string.
+ * @return if the string argument occurs as a substring within this
+ * object, then the index of the first character of the first
+ * such substring is returned; if it does not occur as a
+ * substring, <code>-1</code> is returned.
+ * @throws java.lang.NullPointerException if <code>str</code> is
+ * <code>null</code>.
+ */
+ public int indexOf(String str) {
+ return indexOf(str, 0);
+ }
+
+ /**
+ * Returns the index within this string of the first occurrence of the
+ * specified substring, starting at the specified index. The integer
+ * returned is the smallest value <tt>k</tt> for which:
+ * <blockquote><pre>
+ * k >= Math.min(fromIndex, str.length()) &&
+ * this.toString().startsWith(str, k)
+ * </pre></blockquote>
+ * If no such value of <i>k</i> exists, then -1 is returned.
+ *
+ * @param str the substring for which to search.
+ * @param fromIndex the index from which to start the search.
+ * @return the index within this string of the first occurrence of the
+ * specified substring, starting at the specified index.
+ * @throws java.lang.NullPointerException if <code>str</code> is
+ * <code>null</code>.
+ */
+ public int indexOf(String str, int fromIndex) {
+ return String.indexOf(value, 0, count,
+ str.toCharArray(), 0, str.length(), fromIndex);
+ }
+
+ /**
+ * Returns the index within this string of the rightmost occurrence
+ * of the specified substring. The rightmost empty string "" is
+ * considered to occur at the index value <code>this.length()</code>.
+ * The returned index is the largest value <i>k</i> such that
+ * <blockquote><pre>
+ * this.toString().startsWith(str, k)
+ * </pre></blockquote>
+ * is true.
+ *
+ * @param str the substring to search for.
+ * @return if the string argument occurs one or more times as a substring
+ * within this object, then the index of the first character of
+ * the last such substring is returned. If it does not occur as
+ * a substring, <code>-1</code> is returned.
+ * @throws java.lang.NullPointerException if <code>str</code> is
+ * <code>null</code>.
+ */
+ public int lastIndexOf(String str) {
+ return lastIndexOf(str, count);
+ }
+
+ /**
+ * Returns the index within this string of the last occurrence of the
+ * specified substring. The integer returned is the largest value <i>k</i>
+ * such that:
+ * <blockquote><pre>
+ * k <= Math.min(fromIndex, str.length()) &&
+ * this.toString().startsWith(str, k)
+ * </pre></blockquote>
+ * If no such value of <i>k</i> exists, then -1 is returned.
+ *
+ * @param str the substring to search for.
+ * @param fromIndex the index to start the search from.
+ * @return the index within this sequence of the last occurrence of the
+ * specified substring.
+ * @throws java.lang.NullPointerException if <code>str</code> is
+ * <code>null</code>.
+ */
+ public int lastIndexOf(String str, int fromIndex) {
+ return String.lastIndexOf(value, 0, count,
+ str.toCharArray(), 0, str.length(), fromIndex);
+ }
+
+ /**
+ * Causes this character sequence to be replaced by the reverse of
+ * the sequence. If there are any surrogate pairs included in the
+ * sequence, these are treated as single characters for the
+ * reverse operation. Thus, the order of the high-low surrogates
+ * is never reversed.
+ *
+ * Let <i>n</i> be the character length of this character sequence
+ * (not the length in <code>char</code> values) just prior to
+ * execution of the <code>reverse</code> method. Then the
+ * character at index <i>k</i> in the new character sequence is
+ * equal to the character at index <i>n-k-1</i> in the old
+ * character sequence.
+ *
+ * <p>Note that the reverse operation may result in producing
+ * surrogate pairs that were unpaired low-surrogates and
+ * high-surrogates before the operation. For example, reversing
+ * "\uDC00\uD800" produces "\uD800\uDC00" which is
+ * a valid surrogate pair.
+ *
+ * @return a reference to this object.
+ */
+ public AbstractStringBuilder reverse() {
+ boolean hasSurrogate = false;
+ int n = count - 1;
+ for (int j = (n-1) >> 1; j >= 0; --j) {
+ char temp = value[j];
+ char temp2 = value[n - j];
+ if (!hasSurrogate) {
+ hasSurrogate = (temp >= Character.MIN_SURROGATE && temp <= Character.MAX_SURROGATE)
+ || (temp2 >= Character.MIN_SURROGATE && temp2 <= Character.MAX_SURROGATE);
+ }
+ value[j] = temp2;
+ value[n - j] = temp;
+ }
+ if (hasSurrogate) {
+ // Reverse back all valid surrogate pairs
+ for (int i = 0; i < count - 1; i++) {
+ char c2 = value[i];
+ if (Character.isLowSurrogate(c2)) {
+ char c1 = value[i + 1];
+ if (Character.isHighSurrogate(c1)) {
+ value[i++] = c1;
+ value[i] = c2;
+ }
+ }
+ }
+ }
+ return this;
+ }
+
+ /**
+ * Returns a string representing the data in this sequence.
+ * A new <code>String</code> object is allocated and initialized to
+ * contain the character sequence currently represented by this
+ * object. This <code>String</code> is then returned. Subsequent
+ * changes to this sequence do not affect the contents of the
+ * <code>String</code>.
+ *
+ * @return a string representation of this sequence of characters.
+ */
+ public abstract String toString();
+
+ /**
+ * Needed by <tt>String</tt> for the contentEquals method.
+ */
+ final char[] getValue() {
+ return value;
+ }
+
+}