ohair@286: /*
alanb@368:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.tools.internal.ws.wsdl.parser;
ohair@286: 
ohair@286: import com.sun.xml.internal.bind.WhiteSpaceProcessor;
ohair@286: import org.xml.sax.*;
ohair@286: import org.xml.sax.helpers.XMLFilterImpl;
ohair@286: 
ohair@286: /**
ohair@286:  * Strips ignorable whitespace from SAX event stream.
ohair@286:  *
ohair@286:  * <p>
ohair@286:  * This filter works only when the event stream doesn't
ohair@286:  * contain any mixed content.
ohair@286:  *
ohair@286:  * @author
ohair@286:  *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
ohair@286:  *     Vivek Pandey
ohair@286:  */
ohair@286: class WhitespaceStripper extends XMLFilterImpl {
ohair@286: 
ohair@286:     private int state = 0;
ohair@286: 
ohair@286:     private char[] buf = new char[1024];
ohair@286:     private int bufLen = 0;
ohair@286: 
ohair@286:     private static final int AFTER_START_ELEMENT = 1;
ohair@286:     private static final int AFTER_END_ELEMENT = 2;
ohair@286: 
ohair@286:     public WhitespaceStripper(XMLReader reader) {
ohair@286:         setParent(reader);
ohair@286:     }
ohair@286: 
ohair@286:     public WhitespaceStripper(ContentHandler handler, ErrorHandler eh, EntityResolver er) {
ohair@286:         setContentHandler(handler);
ohair@286:         if(eh!=null)    setErrorHandler(eh);
ohair@286:         if(er!=null)    setEntityResolver(er);
ohair@286:     }
ohair@286: 
ohair@286:     public void characters(char[] ch, int start, int length) throws SAXException {
ohair@286:         switch(state) {
ohair@286:         case AFTER_START_ELEMENT:
ohair@286:             // we have to store the characters here, even if it consists entirely
ohair@286:             // of whitespaces. This is because successive characters event might
ohair@286:             // include non-whitespace char, in which case all the whitespaces in
ohair@286:             // this event may suddenly become significant.
ohair@286:             if( bufLen+length>buf.length ) {
ohair@286:                 // reallocate buffer
ohair@286:                 char[] newBuf = new char[Math.max(bufLen+length,buf.length*2)];
ohair@286:                 System.arraycopy(buf,0,newBuf,0,bufLen);
ohair@286:                 buf = newBuf;
ohair@286:             }
ohair@286:             System.arraycopy(ch,start,buf,bufLen,length);
ohair@286:             bufLen += length;
ohair@286:             break;
ohair@286:         case AFTER_END_ELEMENT:
ohair@286:             // check if this is ignorable.
ohair@286:             int len = start+length;
ohair@286:             for( int i=start; i<len; i++ )
ohair@286:                 if( !WhiteSpaceProcessor.isWhiteSpace(ch[i]) ) {
ohair@286:                     super.characters(ch, start, length);
ohair@286:                     return;
ohair@286:                 }
ohair@286:             // if it's entirely whitespace, ignore it.
ohair@286:             break;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
ohair@286:         processPendingText();
ohair@286:         super.startElement(uri, localName, qName, atts);
ohair@286:         state = AFTER_START_ELEMENT;
ohair@286:         bufLen = 0;
ohair@286:     }
ohair@286: 
ohair@286:     public void endElement(String uri, String localName, String qName) throws SAXException {
ohair@286:         processPendingText();
ohair@286:         super.endElement(uri, localName, qName);
ohair@286:         state = AFTER_END_ELEMENT;
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Forwars the buffered characters if it contains any non-whitespace
ohair@286:      * character.
ohair@286:      */
ohair@286:     private void processPendingText() throws SAXException {
ohair@286:         if(state==AFTER_START_ELEMENT) {
ohair@286:             for( int i=bufLen-1; i>=0; i-- )
ohair@286:                 if( !WhiteSpaceProcessor.isWhiteSpace(buf[i]) ) {
ohair@286:                     super.characters(buf, 0, bufLen);
ohair@286:                     return;
ohair@286:                }
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
ohair@286:         // ignore completely.
ohair@286:     }
ohair@286: }