| /* |
| * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0, which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package com.sun.tools.xjc.reader.internalizer; |
| |
| import org.glassfish.jaxb.core.WhiteSpaceProcessor; |
| |
| import org.xml.sax.Attributes; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.ErrorHandler; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.XMLReader; |
| import org.xml.sax.helpers.XMLFilterImpl; |
| |
| /** |
| * Strips ignorable whitespace from SAX event stream. |
| * |
| * <p> |
| * This filter works only when the event stream doesn't |
| * contain any mixed content. |
| * |
| * @author |
| * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com) |
| */ |
| class WhitespaceStripper extends XMLFilterImpl { |
| |
| private int state = 0; |
| |
| private char[] buf = new char[1024]; |
| private int bufLen = 0; |
| |
| private static final int AFTER_START_ELEMENT = 1; |
| private static final int AFTER_END_ELEMENT = 2; |
| |
| public WhitespaceStripper(XMLReader reader) { |
| setParent(reader); |
| } |
| |
| public WhitespaceStripper(ContentHandler handler,ErrorHandler eh,EntityResolver er) { |
| setContentHandler(handler); |
| if(eh!=null) setErrorHandler(eh); |
| if(er!=null) setEntityResolver(er); |
| } |
| |
| @Override |
| public void characters(char[] ch, int start, int length) throws SAXException { |
| switch(state) { |
| case AFTER_START_ELEMENT: |
| // we have to store the characters here, even if it consists entirely |
| // of whitespaces. This is because successive characters event might |
| // include non-whitespace char, in which case all the whitespaces in |
| // this event may suddenly become significant. |
| if( bufLen+length>buf.length ) { |
| // reallocate buffer |
| char[] newBuf = new char[Math.max(bufLen+length,buf.length*2)]; |
| System.arraycopy(buf,0,newBuf,0,bufLen); |
| buf = newBuf; |
| } |
| System.arraycopy(ch,start,buf,bufLen,length); |
| bufLen += length; |
| break; |
| case AFTER_END_ELEMENT: |
| // check if this is ignorable. |
| int len = start+length; |
| for( int i=start; i<len; i++ ) |
| if( !WhiteSpaceProcessor.isWhiteSpace(ch[i]) ) { |
| super.characters(ch, start, length); |
| return; |
| } |
| // if it's entirely whitespace, ignore it. |
| break; |
| } |
| } |
| |
| @Override |
| public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException { |
| processPendingText(); |
| super.startElement(uri, localName, qName, atts); |
| state = AFTER_START_ELEMENT; |
| bufLen = 0; |
| } |
| |
| @Override |
| public void endElement(String uri, String localName, String qName) throws SAXException { |
| processPendingText(); |
| super.endElement(uri, localName, qName); |
| state = AFTER_END_ELEMENT; |
| } |
| |
| /** |
| * Forwars the buffered characters if it contains any non-whitespace |
| * character. |
| */ |
| private void processPendingText() throws SAXException { |
| if(state==AFTER_START_ELEMENT) { |
| for( int i=bufLen-1; i>=0; i-- ) |
| if( !WhiteSpaceProcessor.isWhiteSpace(buf[i]) ) { |
| super.characters(buf, 0, bufLen); |
| return; |
| } |
| } |
| } |
| |
| @Override |
| public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException { |
| // ignore completely. |
| } |
| } |