| /* |
| * Copyright (c) 2005, 2010, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.xml.internal.txw2.output; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.ext.LexicalHandler; |
| import org.xml.sax.helpers.XMLFilterImpl; |
| |
| import java.util.Stack; |
| |
| /** |
| * {@link XMLFilterImpl} that does indentation to SAX events. |
| * |
| * @author Kohsuke Kawaguchi |
| */ |
| public class IndentingXMLFilter extends XMLFilterImpl implements LexicalHandler { |
| private LexicalHandler lexical; |
| |
| public IndentingXMLFilter() { |
| } |
| |
| public IndentingXMLFilter(ContentHandler handler) { |
| setContentHandler(handler); |
| } |
| |
| public IndentingXMLFilter(ContentHandler handler, LexicalHandler lexical) { |
| setContentHandler(handler); |
| setLexicalHandler(lexical); |
| } |
| |
| public LexicalHandler getLexicalHandler() { |
| return lexical; |
| } |
| |
| public void setLexicalHandler(LexicalHandler lexical) { |
| this.lexical = lexical; |
| } |
| |
| |
| /** |
| * Return the current indent step. |
| * |
| * <p>Return the current indent step: each start tag will be |
| * indented by this number of spaces times the number of |
| * ancestors that the element has.</p> |
| * |
| * @return The number of spaces in each indentation step, |
| * or 0 or less for no indentation. |
| * @see #setIndentStep(int) |
| * |
| * @deprecated |
| * Only return the length of the indent string. |
| */ |
| public int getIndentStep () |
| { |
| return indentStep.length(); |
| } |
| |
| |
| /** |
| * Set the current indent step. |
| * |
| * @param indentStep The new indent step (0 or less for no |
| * indentation). |
| * @see #getIndentStep() |
| * |
| * @deprecated |
| * Should use the version that takes string. |
| */ |
| public void setIndentStep (int indentStep) |
| { |
| StringBuilder s = new StringBuilder(); |
| for( ; indentStep>0; indentStep-- ) s.append(' '); |
| setIndentStep(s.toString()); |
| } |
| |
| public void setIndentStep(String s) { |
| this.indentStep = s; |
| } |
| |
| |
| |
| //////////////////////////////////////////////////////////////////// |
| // Override methods from XMLWriter. |
| //////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Write a start tag. |
| * |
| * <p>Each tag will begin on a new line, and will be |
| * indented by the current indent step times the number |
| * of ancestors that the element has.</p> |
| * |
| * <p>The newline and indentation will be passed on down |
| * the filter chain through regular characters events.</p> |
| * |
| * @param uri The element's Namespace URI. |
| * @param localName The element's local name. |
| * @param qName The element's qualified (prefixed) name. |
| * @param atts The element's attribute list. |
| * @exception org.xml.sax.SAXException If there is an error |
| * writing the start tag, or if a filter further |
| * down the chain raises an exception. |
| * @see XMLWriter#startElement(String, String, String,Attributes) |
| */ |
| public void startElement (String uri, String localName, |
| String qName, Attributes atts) |
| throws SAXException { |
| stateStack.push(SEEN_ELEMENT); |
| state = SEEN_NOTHING; |
| if (depth > 0) { |
| writeNewLine(); |
| } |
| doIndent(); |
| super.startElement(uri, localName, qName, atts); |
| depth++; |
| } |
| |
| private void writeNewLine() throws SAXException { |
| super.characters(NEWLINE,0,NEWLINE.length); |
| } |
| |
| private static final char[] NEWLINE = {'\n'}; |
| |
| |
| /** |
| * Write an end tag. |
| * |
| * <p>If the element has contained other elements, the tag |
| * will appear indented on a new line; otherwise, it will |
| * appear immediately following whatever came before.</p> |
| * |
| * <p>The newline and indentation will be passed on down |
| * the filter chain through regular characters events.</p> |
| * |
| * @param uri The element's Namespace URI. |
| * @param localName The element's local name. |
| * @param qName The element's qualified (prefixed) name. |
| * @exception org.xml.sax.SAXException If there is an error |
| * writing the end tag, or if a filter further |
| * down the chain raises an exception. |
| * @see XMLWriter#endElement(String, String, String) |
| */ |
| public void endElement (String uri, String localName, String qName) |
| throws SAXException |
| { |
| depth--; |
| if (state == SEEN_ELEMENT) { |
| writeNewLine(); |
| doIndent(); |
| } |
| super.endElement(uri, localName, qName); |
| state = stateStack.pop(); |
| } |
| |
| |
| // /** |
| // * Write a empty element tag. |
| // * |
| // * <p>Each tag will appear on a new line, and will be |
| // * indented by the current indent step times the number |
| // * of ancestors that the element has.</p> |
| // * |
| // * <p>The newline and indentation will be passed on down |
| // * the filter chain through regular characters events.</p> |
| // * |
| // * @param uri The element's Namespace URI. |
| // * @param localName The element's local name. |
| // * @param qName The element's qualified (prefixed) name. |
| // * @param atts The element's attribute list. |
| // * @exception org.xml.sax.SAXException If there is an error |
| // * writing the empty tag, or if a filter further |
| // * down the chain raises an exception. |
| // * @see XMLWriter#emptyElement(String, String, String, Attributes) |
| // */ |
| // public void emptyElement (String uri, String localName, |
| // String qName, Attributes atts) |
| // throws SAXException |
| // { |
| // state = SEEN_ELEMENT; |
| // if (depth > 0) { |
| // super.characters("\n"); |
| // } |
| // doIndent(); |
| // super.emptyElement(uri, localName, qName, atts); |
| // } |
| |
| |
| /** |
| * Write a sequence of characters. |
| * |
| * @param ch The characters to write. |
| * @param start The starting position in the array. |
| * @param length The number of characters to use. |
| * @exception org.xml.sax.SAXException If there is an error |
| * writing the characters, or if a filter further |
| * down the chain raises an exception. |
| * @see XMLWriter#characters(char[], int, int) |
| */ |
| public void characters (char ch[], int start, int length) |
| throws SAXException |
| { |
| state = SEEN_DATA; |
| super.characters(ch, start, length); |
| } |
| |
| public void comment(char ch[], int start, int length) throws SAXException { |
| if (depth > 0) { |
| writeNewLine(); |
| } |
| doIndent(); |
| if(lexical!=null) |
| lexical.comment(ch,start,length); |
| } |
| |
| public void startDTD(String name, String publicId, String systemId) throws SAXException { |
| if(lexical!=null) |
| lexical.startDTD(name, publicId, systemId); |
| } |
| |
| public void endDTD() throws SAXException { |
| if(lexical!=null) |
| lexical.endDTD(); |
| } |
| |
| public void startEntity(String name) throws SAXException { |
| if(lexical!=null) |
| lexical.startEntity(name); |
| } |
| |
| public void endEntity(String name) throws SAXException { |
| if(lexical!=null) |
| lexical.endEntity(name); |
| } |
| |
| public void startCDATA() throws SAXException { |
| if(lexical!=null) |
| lexical.startCDATA(); |
| } |
| |
| public void endCDATA() throws SAXException { |
| if(lexical!=null) |
| lexical.endCDATA(); |
| } |
| |
| //////////////////////////////////////////////////////////////////// |
| // Internal methods. |
| //////////////////////////////////////////////////////////////////// |
| |
| |
| /** |
| * Print indentation for the current level. |
| * |
| * @exception org.xml.sax.SAXException If there is an error |
| * writing the indentation characters, or if a filter |
| * further down the chain raises an exception. |
| */ |
| private void doIndent () |
| throws SAXException |
| { |
| if (depth > 0) { |
| char[] ch = indentStep.toCharArray(); |
| for( int i=0; i<depth; i++ ) |
| characters(ch, 0, ch.length); |
| } |
| } |
| |
| |
| //////////////////////////////////////////////////////////////////// |
| // Constants. |
| //////////////////////////////////////////////////////////////////// |
| |
| private final static Object SEEN_NOTHING = new Object(); |
| private final static Object SEEN_ELEMENT = new Object(); |
| private final static Object SEEN_DATA = new Object(); |
| |
| |
| //////////////////////////////////////////////////////////////////// |
| // Internal state. |
| //////////////////////////////////////////////////////////////////// |
| |
| private Object state = SEEN_NOTHING; |
| private Stack<Object> stateStack = new Stack<Object>(); |
| |
| private String indentStep = ""; |
| private int depth = 0; |
| } |