Mercurial > jdk8-mips64-public > jaxws / file revision

 /*

  * Copyright (c) 1997, 2011, 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

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  */

 package com.sun.tools.internal.xjc.reader.internalizer;

 import com.sun.xml.internal.bind.unmarshaller.DOMScanner;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 import org.w3c.dom.Node;

 import org.xml.sax.Attributes;

 import org.xml.sax.ContentHandler;

 import org.xml.sax.Locator;

 import org.xml.sax.SAXException;

 import org.xml.sax.helpers.XMLFilterImpl;

 /**

  * Produces a complete series of SAX events from any DOM node

  * in the DOMForest.

  *

  * <p>

  * This class hides a logic of re-associating {@link Locator}

  * to the generated SAX event stream.

  *

  * @author

  *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

  */

 public class DOMForestScanner {

     private final DOMForest forest;

     /**

      * Scans DOM nodes of the given forest.

      *

      * DOM node parameters to the scan method must be a part of

      * this forest.

      */

     public DOMForestScanner( DOMForest _forest ) {

         this.forest = _forest;

     }

     /**

      * Generates the whole set of SAX events by treating

      * element e as if it's a root element.

      */

     public void scan( Element e, ContentHandler contentHandler ) throws SAXException {

         DOMScanner scanner = new DOMScanner();

         // insert the location resolver into the pipe line

         LocationResolver resolver = new LocationResolver(scanner);

         resolver.setContentHandler(contentHandler);

         // parse this DOM.

         scanner.setContentHandler(resolver);

         scanner.scan(e);

     }

     /**

      * Generates the whole set of SAX events from the given Document

      * in the DOMForest.

      */

     public void scan( Document d, ContentHandler contentHandler ) throws SAXException {

         scan( d.getDocumentElement(), contentHandler );

     }

     /**

      * Intercepts the invocation of the setDocumentLocator method

      * and passes itself as the locator.

      *

      * If the client calls one of the methods on the Locator interface,

      * use the LocatorTable to resolve the source location.

      */

     private class LocationResolver extends XMLFilterImpl implements Locator {

         LocationResolver( DOMScanner _parent ) {

             this.parent = _parent;

         }

         private final DOMScanner parent;

         /**

          * Flag that tells us whether we are processing a start element event

          * or an end element event.

          *

          * DOMScanner's getCurrentLocation method doesn't tell us which, but

          * this information is necessary to return the correct source line information.

          *

          * Thus we set this flag appropriately before we pass an event to

          * the next ContentHandler, thereby making it possible to figure

          * out which location to return.

          */

         private boolean inStart = false;

         @Override

         public void setDocumentLocator(Locator locator) {

             // ignore one set by the parent.

             super.setDocumentLocator(this);

         }

         @Override

         public void endElement(String namespaceURI, String localName, String qName) throws SAXException {

             inStart = false;

             super.endElement(namespaceURI, localName, qName);

         }

         @Override

         public void startElement(String namespaceURI, String localName, String qName, Attributes atts)

             throws SAXException {

             inStart = true;

             super.startElement(namespaceURI, localName, qName, atts);

         }

         private Locator findLocator() {

             Node n = parent.getCurrentLocation();

             if( n instanceof Element ) {

                 Element e = (Element)n;

                 if( inStart )

                     return forest.locatorTable.getStartLocation( e );

                 else

                     return forest.locatorTable.getEndLocation( e );

             }

             return null;

         }

         //

         //

         // Locator methods

         //

         //

         public int getColumnNumber() {

             Locator l = findLocator();

             if(l!=null)     return l.getColumnNumber();

             return          -1;

         }

         public int getLineNumber() {

             Locator l = findLocator();

             if(l!=null)     return l.getLineNumber();

             return          -1;

         }

         public String getPublicId() {

             Locator l = findLocator();

             if(l!=null)     return l.getPublicId();

             return          null;

         }

         public String getSystemId() {

             Locator l = findLocator();

             if(l!=null)     return l.getSystemId();

             return          null;

         }

     }

 }