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/*
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* Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.swing.text;
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import java.io.Writer;
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import java.io.IOException;
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import java.util.Enumeration;
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/**
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* AbstractWriter is an abstract class that actually
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* does the work of writing out the element tree
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* including the attributes. In terms of how much is
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* written out per line, the writer defaults to 100.
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* But this value can be set by subclasses.
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*
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* @author Sunita Mani
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*/
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public abstract class AbstractWriter {
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private ElementIterator it;
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private Writer out;
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private int indentLevel = 0;
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private int indentSpace = 2;
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private Document doc = null;
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private int maxLineLength = 100;
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private int currLength = 0;
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private int startOffset = 0;
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private int endOffset = 0;
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// If (indentLevel * indentSpace) becomes >= maxLineLength, this will
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// get incremened instead of indentLevel to avoid indenting going greater
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// than line length.
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private int offsetIndent = 0;
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/**
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* String used for end of line. If the Document has the property
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* EndOfLineStringProperty, it will be used for newlines. Otherwise
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* the System property line.separator will be used. The line separator
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* can also be set.
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*/
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private String lineSeparator;
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/**
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* True indicates that when writing, the line can be split, false
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* indicates that even if the line is > than max line length it should
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* not be split.
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*/
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private boolean canWrapLines;
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/**
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* True while the current line is empty. This will remain true after
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* indenting.
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*/
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private boolean isLineEmpty;
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/**
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* Used when indenting. Will contain the spaces.
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*/
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private char[] indentChars;
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/**
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* Used when writing out a string.
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*/
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private char[] tempChars;
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/**
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* This is used in <code>writeLineSeparator</code> instead of
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* tempChars. If tempChars were used it would mean write couldn't invoke
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* <code>writeLineSeparator</code> as it might have been passed
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* tempChars.
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*/
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private char[] newlineChars;
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/**
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* Used for writing text.
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*/
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private Segment segment;
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/**
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* How the text packages models newlines.
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* @see #getLineSeparator
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*/
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protected static final char NEWLINE = '\n';
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/**
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* Creates a new AbstractWriter.
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* Initializes the ElementIterator with the default
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* root of the document.
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*
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* @param w a Writer.
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* @param doc a Document
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*/
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protected AbstractWriter(Writer w, Document doc) {
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this(w, doc, 0, doc.getLength());
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}
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/**
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* Creates a new AbstractWriter.
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* Initializes the ElementIterator with the
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* element passed in.
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*
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* @param w a Writer
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* @param doc an Element
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* @param pos The location in the document to fetch the
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* content.
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* @param len The amount to write out.
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*/
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protected AbstractWriter(Writer w, Document doc, int pos, int len) {
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this.doc = doc;
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it = new ElementIterator(doc.getDefaultRootElement());
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out = w;
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startOffset = pos;
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endOffset = pos + len;
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Object docNewline = doc.getProperty(DefaultEditorKit.
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EndOfLineStringProperty);
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if (docNewline instanceof String) {
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setLineSeparator((String)docNewline);
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}
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else {
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String newline = null;
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try {
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newline = System.getProperty("line.separator");
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} catch (SecurityException se) {}
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if (newline == null) {
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// Should not get here, but if we do it means we could not
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// find a newline string, use \n in this case.
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newline = "\n";
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}
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setLineSeparator(newline);
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}
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canWrapLines = true;
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}
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/**
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* Creates a new AbstractWriter.
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* Initializes the ElementIterator with the
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* element passed in.
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*
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* @param w a Writer
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* @param root an Element
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*/
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protected AbstractWriter(Writer w, Element root) {
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this(w, root, 0, root.getEndOffset());
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}
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/**
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* Creates a new AbstractWriter.
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* Initializes the ElementIterator with the
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* element passed in.
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*
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* @param w a Writer
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* @param root an Element
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* @param pos The location in the document to fetch the
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* content.
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* @param len The amount to write out.
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*/
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protected AbstractWriter(Writer w, Element root, int pos, int len) {
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this.doc = root.getDocument();
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it = new ElementIterator(root);
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out = w;
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startOffset = pos;
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endOffset = pos + len;
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canWrapLines = true;
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}
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/**
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* Returns the first offset to be output.
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*
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* @since 1.3
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*/
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public int getStartOffset() {
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return startOffset;
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}
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/**
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* Returns the last offset to be output.
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*
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* @since 1.3
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*/
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public int getEndOffset() {
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return endOffset;
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}
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/**
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* Fetches the ElementIterator.
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*
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* @return the ElementIterator.
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*/
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protected ElementIterator getElementIterator() {
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return it;
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}
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/**
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* Returns the Writer that is used to output the content.
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*
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* @since 1.3
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*/
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protected Writer getWriter() {
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return out;
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}
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/**
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* Fetches the document.
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*
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* @return the Document.
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*/
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protected Document getDocument() {
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return doc;
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}
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/**
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* This method determines whether the current element
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* is in the range specified. When no range is specified,
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* the range is initialized to be the entire document.
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* inRange() returns true if the range specified intersects
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* with the element's range.
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*
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* @param next an Element.
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* @return boolean that indicates whether the element
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* is in the range.
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*/
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protected boolean inRange(Element next) {
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int startOffset = getStartOffset();
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int endOffset = getEndOffset();
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if ((next.getStartOffset() >= startOffset &&
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next.getStartOffset() < endOffset) ||
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(startOffset >= next.getStartOffset() &&
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startOffset < next.getEndOffset())) {
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return true;
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}
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return false;
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}
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/**
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* This abstract method needs to be implemented
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* by subclasses. Its responsibility is to
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* iterate over the elements and use the write()
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* methods to generate output in the desired format.
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*/
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abstract protected void write() throws IOException, BadLocationException;
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/**
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* Returns the text associated with the element.
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* The assumption here is that the element is a
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* leaf element. Throws a BadLocationException
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* when encountered.
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*
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* @param elem an <code>Element</code>
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* @exception BadLocationException if pos represents an invalid
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* location within the document
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* @return the text as a <code>String</code>
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*/
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protected String getText(Element elem) throws BadLocationException {
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return doc.getText(elem.getStartOffset(),
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elem.getEndOffset() - elem.getStartOffset());
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}
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/**
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* Writes out text. If a range is specified when the constructor
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* is invoked, then only the appropriate range of text is written
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* out.
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*
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* @param elem an Element.
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* @exception IOException on any I/O error
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* @exception BadLocationException if pos represents an invalid
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* location within the document.
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*/
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protected void text(Element elem) throws BadLocationException,
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IOException {
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int start = Math.max(getStartOffset(), elem.getStartOffset());
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int end = Math.min(getEndOffset(), elem.getEndOffset());
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if (start < end) {
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if (segment == null) {
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segment = new Segment();
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}
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getDocument().getText(start, end - start, segment);
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if (segment.count > 0) {
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write(segment.array, segment.offset, segment.count);
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}
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}
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}
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/**
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* Enables subclasses to set the number of characters they
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* want written per line. The default is 100.
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*
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* @param l the maximum line length.
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*/
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protected void setLineLength(int l) {
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maxLineLength = l;
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}
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/**
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* Returns the maximum line length.
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*
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* @since 1.3
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*/
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protected int getLineLength() {
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return maxLineLength;
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}
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/**
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* Sets the current line length.
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*
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* @since 1.3
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*/
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protected void setCurrentLineLength(int length) {
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currLength = length;
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isLineEmpty = (currLength == 0);
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}
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/**
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* Returns the current line length.
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*
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* @since 1.3
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*/
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protected int getCurrentLineLength() {
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return currLength;
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}
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/**
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* Returns true if the current line should be considered empty. This
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* is true when <code>getCurrentLineLength</code> == 0 ||
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* <code>indent</code> has been invoked on an empty line.
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*
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* @since 1.3
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*/
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protected boolean isLineEmpty() {
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return isLineEmpty;
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}
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/**
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* Sets whether or not lines can be wrapped. This can be toggled
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* during the writing of lines. For example, outputting HTML might
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* set this to false when outputting a quoted string.
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*
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* @since 1.3
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*/
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protected void setCanWrapLines(boolean newValue) {
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canWrapLines = newValue;
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}
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/**
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* Returns whether or not the lines can be wrapped. If this is false
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* no lineSeparator's will be output.
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*
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* @since 1.3
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*/
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protected boolean getCanWrapLines() {
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return canWrapLines;
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}
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/**
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* Enables subclasses to specify how many spaces an indent
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* maps to. When indentation takes place, the indent level
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* is multiplied by this mapping. The default is 2.
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*
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* @param space an int representing the space to indent mapping.
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*/
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protected void setIndentSpace(int space) {
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indentSpace = space;
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}
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/**
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* Returns the amount of space to indent.
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*
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* @since 1.3
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*/
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protected int getIndentSpace() {
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return indentSpace;
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}
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/**
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* Sets the String used to reprsent newlines. This is initialized
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* in the constructor from either the Document, or the System property
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* line.separator.
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*
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* @since 1.3
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*/
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public void setLineSeparator(String value) {
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lineSeparator = value;
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}
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/**
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* Returns the string used to represent newlines.
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*
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* @since 1.3
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*/
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public String getLineSeparator() {
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return lineSeparator;
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}
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/**
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* Increments the indent level. If indenting would cause
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* <code>getIndentSpace()</code> *<code>getIndentLevel()</code> to be >
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* than <code>getLineLength()</code> this will not cause an indent.
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*/
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protected void incrIndent() {
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// Only increment to a certain point.
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if (offsetIndent > 0) {
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offsetIndent++;
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}
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else {
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if (++indentLevel * getIndentSpace() >= getLineLength()) {
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offsetIndent++;
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--indentLevel;
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}
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}
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}
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/**
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* Decrements the indent level.
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*/
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protected void decrIndent() {
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if (offsetIndent > 0) {
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--offsetIndent;
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}
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else {
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indentLevel--;
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}
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}
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|
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/**
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* Returns the current indentation level. That is, the number of times
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* <code>incrIndent</code> has been invoked minus the number of times
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* <code>decrIndent</code> has been invoked.
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*
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* @since 1.3
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*/
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protected int getIndentLevel() {
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return indentLevel;
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}
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|
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459 |
/**
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460 |
* Does indentation. The number of spaces written
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* out is indent level times the space to map mapping. If the current
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462 |
* line is empty, this will not make it so that the current line is
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* still considered empty.
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*
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* @exception IOException on any I/O error
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*/
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|
467 |
protected void indent() throws IOException {
|
|
468 |
int max = getIndentLevel() * getIndentSpace();
|
|
469 |
if (indentChars == null || max > indentChars.length) {
|
|
470 |
indentChars = new char[max];
|
|
471 |
for (int counter = 0; counter < max; counter++) {
|
|
472 |
indentChars[counter] = ' ';
|
|
473 |
}
|
|
474 |
}
|
|
475 |
int length = getCurrentLineLength();
|
|
476 |
boolean wasEmpty = isLineEmpty();
|
|
477 |
output(indentChars, 0, max);
|
|
478 |
if (wasEmpty && length == 0) {
|
|
479 |
isLineEmpty = true;
|
|
480 |
}
|
|
481 |
}
|
|
482 |
|
|
483 |
/**
|
|
484 |
* Writes out a character. This is implemented to invoke
|
|
485 |
* the <code>write</code> method that takes a char[].
|
|
486 |
*
|
|
487 |
* @param ch a char.
|
|
488 |
* @exception IOException on any I/O error
|
|
489 |
*/
|
|
490 |
protected void write(char ch) throws IOException {
|
|
491 |
if (tempChars == null) {
|
|
492 |
tempChars = new char[128];
|
|
493 |
}
|
|
494 |
tempChars[0] = ch;
|
|
495 |
write(tempChars, 0, 1);
|
|
496 |
}
|
|
497 |
|
|
498 |
/**
|
|
499 |
* Writes out a string. This is implemented to invoke the
|
|
500 |
* <code>write</code> method that takes a char[].
|
|
501 |
*
|
|
502 |
* @param content a String.
|
|
503 |
* @exception IOException on any I/O error
|
|
504 |
*/
|
|
505 |
protected void write(String content) throws IOException {
|
|
506 |
if (content == null) {
|
|
507 |
return;
|
|
508 |
}
|
|
509 |
int size = content.length();
|
|
510 |
if (tempChars == null || tempChars.length < size) {
|
|
511 |
tempChars = new char[size];
|
|
512 |
}
|
|
513 |
content.getChars(0, size, tempChars, 0);
|
|
514 |
write(tempChars, 0, size);
|
|
515 |
}
|
|
516 |
|
|
517 |
/**
|
|
518 |
* Writes the line separator. This invokes <code>output</code> directly
|
|
519 |
* as well as setting the <code>lineLength</code> to 0.
|
|
520 |
*
|
|
521 |
* @since 1.3
|
|
522 |
*/
|
|
523 |
protected void writeLineSeparator() throws IOException {
|
|
524 |
String newline = getLineSeparator();
|
|
525 |
int length = newline.length();
|
|
526 |
if (newlineChars == null || newlineChars.length < length) {
|
|
527 |
newlineChars = new char[length];
|
|
528 |
}
|
|
529 |
newline.getChars(0, length, newlineChars, 0);
|
|
530 |
output(newlineChars, 0, length);
|
|
531 |
setCurrentLineLength(0);
|
|
532 |
}
|
|
533 |
|
|
534 |
/**
|
|
535 |
* All write methods call into this one. If <code>getCanWrapLines()</code>
|
|
536 |
* returns false, this will call <code>output</code> with each sequence
|
|
537 |
* of <code>chars</code> that doesn't contain a NEWLINE, followed
|
|
538 |
* by a call to <code>writeLineSeparator</code>. On the other hand,
|
|
539 |
* if <code>getCanWrapLines()</code> returns true, this will split the
|
|
540 |
* string, as necessary, so <code>getLineLength</code> is honored.
|
|
541 |
* The only exception is if the current string contains no whitespace,
|
|
542 |
* and won't fit in which case the line length will exceed
|
|
543 |
* <code>getLineLength</code>.
|
|
544 |
*
|
|
545 |
* @since 1.3
|
|
546 |
*/
|
|
547 |
protected void write(char[] chars, int startIndex, int length)
|
|
548 |
throws IOException {
|
|
549 |
if (!getCanWrapLines()) {
|
|
550 |
// We can not break string, just track if a newline
|
|
551 |
// is in it.
|
|
552 |
int lastIndex = startIndex;
|
|
553 |
int endIndex = startIndex + length;
|
|
554 |
int newlineIndex = indexOf(chars, NEWLINE, startIndex, endIndex);
|
|
555 |
while (newlineIndex != -1) {
|
|
556 |
if (newlineIndex > lastIndex) {
|
|
557 |
output(chars, lastIndex, newlineIndex - lastIndex);
|
|
558 |
}
|
|
559 |
writeLineSeparator();
|
|
560 |
lastIndex = newlineIndex + 1;
|
|
561 |
newlineIndex = indexOf(chars, '\n', lastIndex, endIndex);
|
|
562 |
}
|
|
563 |
if (lastIndex < endIndex) {
|
|
564 |
output(chars, lastIndex, endIndex - lastIndex);
|
|
565 |
}
|
|
566 |
}
|
|
567 |
else {
|
|
568 |
// We can break chars if the length exceeds maxLength.
|
|
569 |
int lastIndex = startIndex;
|
|
570 |
int endIndex = startIndex + length;
|
|
571 |
int lineLength = getCurrentLineLength();
|
|
572 |
int maxLength = getLineLength();
|
|
573 |
|
|
574 |
while (lastIndex < endIndex) {
|
|
575 |
int newlineIndex = indexOf(chars, NEWLINE, lastIndex,
|
|
576 |
endIndex);
|
|
577 |
boolean needsNewline = false;
|
|
578 |
boolean forceNewLine = false;
|
|
579 |
|
|
580 |
lineLength = getCurrentLineLength();
|
|
581 |
if (newlineIndex != -1 && (lineLength +
|
|
582 |
(newlineIndex - lastIndex)) < maxLength) {
|
|
583 |
if (newlineIndex > lastIndex) {
|
|
584 |
output(chars, lastIndex, newlineIndex - lastIndex);
|
|
585 |
}
|
|
586 |
lastIndex = newlineIndex + 1;
|
|
587 |
forceNewLine = true;
|
|
588 |
}
|
|
589 |
else if (newlineIndex == -1 && (lineLength +
|
|
590 |
(endIndex - lastIndex)) < maxLength) {
|
|
591 |
if (endIndex > lastIndex) {
|
|
592 |
output(chars, lastIndex, endIndex - lastIndex);
|
|
593 |
}
|
|
594 |
lastIndex = endIndex;
|
|
595 |
}
|
|
596 |
else {
|
|
597 |
// Need to break chars, find a place to split chars at,
|
|
598 |
// from lastIndex to endIndex,
|
|
599 |
// or maxLength - lineLength whichever is smaller
|
|
600 |
int breakPoint = -1;
|
|
601 |
int maxBreak = Math.min(endIndex - lastIndex,
|
|
602 |
maxLength - lineLength - 1);
|
|
603 |
int counter = 0;
|
|
604 |
while (counter < maxBreak) {
|
|
605 |
if (Character.isWhitespace(chars[counter +
|
|
606 |
lastIndex])) {
|
|
607 |
breakPoint = counter;
|
|
608 |
}
|
|
609 |
counter++;
|
|
610 |
}
|
|
611 |
if (breakPoint != -1) {
|
|
612 |
// Found a place to break at.
|
|
613 |
breakPoint += lastIndex + 1;
|
|
614 |
output(chars, lastIndex, breakPoint - lastIndex);
|
|
615 |
lastIndex = breakPoint;
|
|
616 |
needsNewline = true;
|
|
617 |
}
|
|
618 |
else {
|
|
619 |
// No where good to break.
|
|
620 |
|
|
621 |
// find the next whitespace, or write out the
|
|
622 |
// whole string.
|
|
623 |
// maxBreak will be negative if current line too
|
|
624 |
// long.
|
|
625 |
counter = Math.max(0, maxBreak);
|
|
626 |
maxBreak = endIndex - lastIndex;
|
|
627 |
while (counter < maxBreak) {
|
|
628 |
if (Character.isWhitespace(chars[counter +
|
|
629 |
lastIndex])) {
|
|
630 |
breakPoint = counter;
|
|
631 |
break;
|
|
632 |
}
|
|
633 |
counter++;
|
|
634 |
}
|
|
635 |
if (breakPoint == -1) {
|
|
636 |
output(chars, lastIndex, endIndex - lastIndex);
|
|
637 |
breakPoint = endIndex;
|
|
638 |
}
|
|
639 |
else {
|
|
640 |
breakPoint += lastIndex;
|
|
641 |
if (chars[breakPoint] == NEWLINE) {
|
|
642 |
output(chars, lastIndex, breakPoint++ -
|
|
643 |
lastIndex);
|
|
644 |
forceNewLine = true;
|
|
645 |
}
|
|
646 |
else {
|
|
647 |
output(chars, lastIndex, ++breakPoint -
|
|
648 |
lastIndex);
|
|
649 |
needsNewline = true;
|
|
650 |
}
|
|
651 |
}
|
|
652 |
lastIndex = breakPoint;
|
|
653 |
}
|
|
654 |
}
|
|
655 |
if (forceNewLine || needsNewline || lastIndex < endIndex) {
|
|
656 |
writeLineSeparator();
|
|
657 |
if (lastIndex < endIndex || !forceNewLine) {
|
|
658 |
indent();
|
|
659 |
}
|
|
660 |
}
|
|
661 |
}
|
|
662 |
}
|
|
663 |
}
|
|
664 |
|
|
665 |
/**
|
|
666 |
* Writes out the set of attributes as " <name>=<value>"
|
|
667 |
* pairs. It throws an IOException when encountered.
|
|
668 |
*
|
|
669 |
* @param attr an AttributeSet.
|
|
670 |
* @exception IOException on any I/O error
|
|
671 |
*/
|
|
672 |
protected void writeAttributes(AttributeSet attr) throws IOException {
|
|
673 |
|
|
674 |
Enumeration names = attr.getAttributeNames();
|
|
675 |
while (names.hasMoreElements()) {
|
|
676 |
Object name = names.nextElement();
|
|
677 |
write(" " + name + "=" + attr.getAttribute(name));
|
|
678 |
}
|
|
679 |
}
|
|
680 |
|
|
681 |
/**
|
|
682 |
* The last stop in writing out content. All the write methods eventually
|
|
683 |
* make it to this method, which invokes <code>write</code> on the
|
|
684 |
* Writer.
|
|
685 |
* <p>This method also updates the line length based on
|
|
686 |
* <code>length</code>. If this is invoked to output a newline, the
|
|
687 |
* current line length will need to be reset as will no longer be
|
|
688 |
* valid. If it is up to the caller to do this. Use
|
|
689 |
* <code>writeLineSeparator</code> to write out a newline, which will
|
|
690 |
* property update the current line length.
|
|
691 |
*
|
|
692 |
* @since 1.3
|
|
693 |
*/
|
|
694 |
protected void output(char[] content, int start, int length)
|
|
695 |
throws IOException {
|
|
696 |
getWriter().write(content, start, length);
|
|
697 |
setCurrentLineLength(getCurrentLineLength() + length);
|
|
698 |
}
|
|
699 |
|
|
700 |
/**
|
|
701 |
* Support method to locate an occurence of a particular character.
|
|
702 |
*/
|
|
703 |
private int indexOf(char[] chars, char sChar, int startIndex,
|
|
704 |
int endIndex) {
|
|
705 |
while(startIndex < endIndex) {
|
|
706 |
if (chars[startIndex] == sChar) {
|
|
707 |
return startIndex;
|
|
708 |
}
|
|
709 |
startIndex++;
|
|
710 |
}
|
|
711 |
return -1;
|
|
712 |
}
|
|
713 |
}
|