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/*
 * Copyright (c) 1997, 2020 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.ws.wsdl.parser;

import org.glassfish.jaxb.core.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.
 *
 * 

* This class hides a logic of re-associating {@link org.xml.sax.Locator} * to the generated SAX event stream. * * @author * Kohsuke Kawaguchi ([email protected]) */ 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; public void setDocumentLocator(Locator locator) { // ignore one set by the parent. super.setDocumentLocator(this); } public void endElement(String namespaceURI, String localName, String qName) throws SAXException { inStart = false; super.endElement(namespaceURI, localName, qName); } 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; } } }





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