--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/lang/StringBuilder.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,479 @@
+/*
+ * Copyright 2003-2004 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;
+
+
+/**
+ * A mutable sequence of characters. This class provides an API compatible
+ * with <code>StringBuffer</code>, but with no guarantee of synchronization.
+ * This class is designed for use as a drop-in replacement for
+ * <code>StringBuffer</code> in places where the string buffer was being
+ * used by a single thread (as is generally the case). Where possible,
+ * it is recommended that this class be used in preference to
+ * <code>StringBuffer</code> as it will be faster under most implementations.
+ *
+ * <p>The principal operations on a <code>StringBuilder</code> are the
+ * <code>append</code> and <code>insert</code> methods, which are
+ * overloaded so as to accept data of any type. Each effectively
+ * converts a given datum to a string and then appends or inserts the
+ * characters of that string to the string builder. The
+ * <code>append</code> method always adds these characters at the end
+ * of the builder; the <code>insert</code> method adds the characters at
+ * a specified point.
+ * <p>
+ * For example, if <code>z</code> refers to a string builder object
+ * whose current contents are "<code>start</code>", then
+ * the method call <code>z.append("le")</code> would cause the string
+ * builder to contain "<code>startle</code>", whereas
+ * <code>z.insert(4, "le")</code> would alter the string builder to
+ * contain "<code>starlet</code>".
+ * <p>
+ * In general, if sb refers to an instance of a <code>StringBuilder</code>,
+ * then <code>sb.append(x)</code> has the same effect as
+ * <code>sb.insert(sb.length(), x)</code>.
+ *
+ * Every string builder has a capacity. As long as the length of the
+ * character sequence contained in the string builder does not exceed
+ * the capacity, it is not necessary to allocate a new internal
+ * buffer. If the internal buffer overflows, it is automatically made larger.
+ *
+ * <p>Instances of <code>StringBuilder</code> are not safe for
+ * use by multiple threads. If such synchronization is required then it is
+ * recommended that {@link java.lang.StringBuffer} be used.
+ *
+ * @author Michael McCloskey
+ * @see java.lang.StringBuffer
+ * @see java.lang.String
+ * @since 1.5
+ */
+public final class StringBuilder
+ extends AbstractStringBuilder
+ implements java.io.Serializable, CharSequence
+{
+
+ /** use serialVersionUID for interoperability */
+ static final long serialVersionUID = 4383685877147921099L;
+
+ /**
+ * Constructs a string builder with no characters in it and an
+ * initial capacity of 16 characters.
+ */
+ public StringBuilder() {
+ super(16);
+ }
+
+ /**
+ * Constructs a string builder with no characters in it and an
+ * initial capacity specified by the <code>capacity</code> argument.
+ *
+ * @param capacity the initial capacity.
+ * @throws NegativeArraySizeException if the <code>capacity</code>
+ * argument is less than <code>0</code>.
+ */
+ public StringBuilder(int capacity) {
+ super(capacity);
+ }
+
+ /**
+ * Constructs a string builder initialized to the contents of the
+ * specified string. The initial capacity of the string builder is
+ * <code>16</code> plus the length of the string argument.
+ *
+ * @param str the initial contents of the buffer.
+ * @throws NullPointerException if <code>str</code> is <code>null</code>
+ */
+ public StringBuilder(String str) {
+ super(str.length() + 16);
+ append(str);
+ }
+
+ /**
+ * Constructs a string builder that contains the same characters
+ * as the specified <code>CharSequence</code>. The initial capacity of
+ * the string builder is <code>16</code> plus the length of the
+ * <code>CharSequence</code> argument.
+ *
+ * @param seq the sequence to copy.
+ * @throws NullPointerException if <code>seq</code> is <code>null</code>
+ */
+ public StringBuilder(CharSequence seq) {
+ this(seq.length() + 16);
+ append(seq);
+ }
+
+ /**
+ * @see java.lang.String#valueOf(java.lang.Object)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(Object obj) {
+ return append(String.valueOf(obj));
+ }
+
+ public StringBuilder append(String str) {
+ super.append(str);
+ return this;
+ }
+
+ // Appends the specified string builder to this sequence.
+ private StringBuilder append(StringBuilder 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;
+ }
+
+ /**
+ * Appends the specified <tt>StringBuffer</tt> to this sequence.
+ * <p>
+ * The characters of the <tt>StringBuffer</tt> argument are appended,
+ * in order, to this sequence, increasing the
+ * length of this sequence by the length of the argument.
+ * If <tt>sb</tt> is <tt>null</tt>, then the four characters
+ * <tt>"null"</tt> are appended to this sequence.
+ * <p>
+ * Let <i>n</i> be the length of this character sequence just prior to
+ * execution of the <tt>append</tt> 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>sb</code>.
+ *
+ * @param sb the <tt>StringBuffer</tt> to append.
+ * @return a reference to this object.
+ */
+ public StringBuilder append(StringBuffer sb) {
+ super.append(sb);
+ return this;
+ }
+
+ /**
+ * @throws IndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder 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);
+ if (s instanceof StringBuilder)
+ return this.append((StringBuilder)s);
+ return this.append(s, 0, s.length());
+ }
+
+ /**
+ * @throws IndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder append(CharSequence s, int start, int end) {
+ super.append(s, start, end);
+ return this;
+ }
+
+ public StringBuilder append(char str[]) {
+ super.append(str);
+ return this;
+ }
+
+ public StringBuilder append(char str[], int offset, int len) {
+ super.append(str, offset, len);
+ return this;
+ }
+
+ /**
+ * @see java.lang.String#valueOf(boolean)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(boolean b) {
+ super.append(b);
+ return this;
+ }
+
+ public StringBuilder append(char c) {
+ super.append(c);
+ return this;
+ }
+
+ /**
+ * @see java.lang.String#valueOf(int)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(int i) {
+ super.append(i);
+ return this;
+ }
+
+ /**
+ * @see java.lang.String#valueOf(long)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(long lng) {
+ super.append(lng);
+ return this;
+ }
+
+ /**
+ * @see java.lang.String#valueOf(float)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(float f) {
+ super.append(f);
+ return this;
+ }
+
+ /**
+ * @see java.lang.String#valueOf(double)
+ * @see #append(java.lang.String)
+ */
+ public StringBuilder append(double d) {
+ super.append(d);
+ return this;
+ }
+
+ /**
+ * @since 1.5
+ */
+ public StringBuilder appendCodePoint(int codePoint) {
+ super.appendCodePoint(codePoint);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder delete(int start, int end) {
+ super.delete(start, end);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder deleteCharAt(int index) {
+ super.deleteCharAt(index);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder replace(int start, int end, String str) {
+ super.replace(start, end, str);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder insert(int index, char str[], int offset,
+ int len)
+ {
+ super.insert(index, str, offset, len);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(java.lang.Object)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, Object obj) {
+ return insert(offset, String.valueOf(obj));
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, String str) {
+ super.insert(offset, str);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder insert(int offset, char str[]) {
+ super.insert(offset, str);
+ return this;
+ }
+
+ /**
+ * @throws IndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder 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());
+ }
+
+ /**
+ * @throws IndexOutOfBoundsException {@inheritDoc}
+ */
+ public StringBuilder insert(int dstOffset, CharSequence s,
+ int start, int end)
+ {
+ super.insert(dstOffset, s, start, end);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(boolean)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, boolean b) {
+ super.insert(offset, b);
+ return this;
+ }
+
+ /**
+ * @throws IndexOutOfBoundsException {@inheritDoc}
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, char c) {
+ super.insert(offset, c);
+ return this;
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(int)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, int i) {
+ return insert(offset, String.valueOf(i));
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(long)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, long l) {
+ return insert(offset, String.valueOf(l));
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(float)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, float f) {
+ return insert(offset, String.valueOf(f));
+ }
+
+ /**
+ * @throws StringIndexOutOfBoundsException {@inheritDoc}
+ * @see java.lang.String#valueOf(double)
+ * @see #insert(int, java.lang.String)
+ * @see #length()
+ */
+ public StringBuilder insert(int offset, double d) {
+ return insert(offset, String.valueOf(d));
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ */
+ public int indexOf(String str) {
+ return indexOf(str, 0);
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ */
+ public int indexOf(String str, int fromIndex) {
+ return String.indexOf(value, 0, count,
+ str.toCharArray(), 0, str.length(), fromIndex);
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ */
+ public int lastIndexOf(String str) {
+ return lastIndexOf(str, count);
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ */
+ public int lastIndexOf(String str, int fromIndex) {
+ return String.lastIndexOf(value, 0, count,
+ str.toCharArray(), 0, str.length(), fromIndex);
+ }
+
+ public StringBuilder reverse() {
+ super.reverse();
+ return this;
+ }
+
+ public String toString() {
+ // Create a copy, don't share the array
+ return new String(value, 0, count);
+ }
+
+ /**
+ * Save the state of the <tt>StringBuilder</tt> instance to a stream
+ * (that is, serialize it).
+ *
+ * @serialData the number of characters currently stored in the string
+ * builder (<tt>int</tt>), followed by the characters in the
+ * string builder (<tt>char[]</tt>). The length of the
+ * <tt>char</tt> array may be greater than the number of
+ * characters currently stored in the string builder, in which
+ * case extra characters are ignored.
+ */
+ private void writeObject(java.io.ObjectOutputStream s)
+ throws java.io.IOException {
+ s.defaultWriteObject();
+ s.writeInt(count);
+ s.writeObject(value);
+ }
+
+ /**
+ * readObject is called to restore the state of the StringBuffer from
+ * a stream.
+ */
+ private void readObject(java.io.ObjectInputStream s)
+ throws java.io.IOException, ClassNotFoundException {
+ s.defaultReadObject();
+ count = s.readInt();
+ value = (char[]) s.readObject();
+ }
+
+}