domvalidatorhelper.java

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/*
 * Copyright 2005 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.jaxp.validation;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Locale;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import com.sun.org.apache.xerces.internal.impl.validation.EntityState;
import com.sun.org.apache.xerces.internal.impl.validation.ValidationManager;
import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator;
import com.sun.org.apache.xerces.internal.impl.xs.util.SimpleLocator;
import com.sun.org.apache.xerces.internal.util.NamespaceSupport;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.util.XMLAttributesImpl;
import com.sun.org.apache.xerces.internal.util.XMLSymbols;
import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLString;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLParseException;
import org.w3c.dom.Attr;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Entity;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;

/**
 * <p>A validator helper for <code>DOMSource</code>s.</p>
 * 
 * @author Michael Glavassevich, IBM
 * @version $Id: DOMValidatorHelper.java,v 1.1.4.1 2005/09/05 11:38:25 sunithareddy Exp $
 */
final class DOMValidatorHelper implements ValidatorHelper, EntityState {
    
    //
    // Constants
    //

    /** Chunk size (1024). */
    private static final int CHUNK_SIZE = (1 << 10);
    
    /** Chunk mask (CHUNK_SIZE - 1). */
    private static final int CHUNK_MASK = CHUNK_SIZE - 1;
    
    // property identifiers
    
    /** Property identifier: error reporter. */
    private static final String ERROR_REPORTER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;
    
    /** Property identifier: namespace context. */
    private static final String NAMESPACE_CONTEXT =
        Constants.XERCES_PROPERTY_PREFIX + Constants.NAMESPACE_CONTEXT_PROPERTY;
    
    /** Property identifier: XML Schema validator. */
    private static final String SCHEMA_VALIDATOR =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_VALIDATOR_PROPERTY;
    
    /** Property identifier: symbol table. */
    private static final String SYMBOL_TABLE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;
    
    /** Property identifier: validation manager. */
    private static final String VALIDATION_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.VALIDATION_MANAGER_PROPERTY;
    
    //
    // Data
    //
    
    /** Error reporter. */
    private XMLErrorReporter fErrorReporter;
    
    /** The namespace context of this document: stores namespaces in scope. **/
    private NamespaceSupport fNamespaceContext;
    
    /** The namespace context of the DOMSource, includes context from ancestor nodes. **/
    private DOMNamespaceContext fDOMNamespaceContext = new DOMNamespaceContext();
    
    /** Schema validator. **/
    private XMLSchemaValidator fSchemaValidator;
    
    /** Symbol table **/
    private SymbolTable fSymbolTable;
    
    /** Validation manager. **/
    private ValidationManager fValidationManager;
    
    /** Component manager. **/
    private XMLSchemaValidatorComponentManager fComponentManager;
    
    /** Simple Locator. **/
    private final SimpleLocator fXMLLocator = new SimpleLocator(null, null, -1, -1, -1);
    
    /** DOM document handler. **/
    private DOMDocumentHandler fDOMValidatorHandler;
    
    /** DOM result augmentor. **/
    private final DOMResultAugmentor fDOMResultAugmentor = new DOMResultAugmentor(this);
    
    /** DOM result builder. **/
    private final DOMResultBuilder fDOMResultBuilder = new DOMResultBuilder();
    
    /** Map for tracking unparsed entities. **/
    private NamedNodeMap fEntities = null;
    
    /** Array for holding character data. **/
    private char [] fCharBuffer = new char[CHUNK_SIZE];
    
    /** Root node. **/
    private Node fRoot;
    
    /** Current element. **/
    private Node fCurrentElement;
    
    /** Fields for start element, end element and characters. **/
    final QName fElementQName = new QName();
    final QName fAttributeQName = new QName();
    final XMLAttributesImpl fAttributes = new XMLAttributesImpl(); 
    final XMLString fTempString = new XMLString();
    
    public DOMValidatorHelper(XMLSchemaValidatorComponentManager componentManager) {
        fComponentManager = componentManager;
        fErrorReporter = (XMLErrorReporter) fComponentManager.getProperty(ERROR_REPORTER);
        fNamespaceContext = (NamespaceSupport) fComponentManager.getProperty(NAMESPACE_CONTEXT);
        fSchemaValidator = (XMLSchemaValidator) fComponentManager.getProperty(SCHEMA_VALIDATOR);
        fSymbolTable = (SymbolTable) fComponentManager.getProperty(SYMBOL_TABLE);        
        fValidationManager = (ValidationManager) fComponentManager.getProperty(VALIDATION_MANAGER);
    }
    
    /*
     * ValidatorHelper methods
     */
    
    public void validate(Source source, Result result) 
        throws SAXException, IOException {
        if (result instanceof DOMResult || result == null) {
            final DOMSource domSource = (DOMSource) source;
            final DOMResult domResult = (DOMResult) result;
            Node node = domSource.getNode();
            fRoot = node;
            if (node != null) {
                fComponentManager.reset();
                fValidationManager.setEntityState(this);
                fDOMNamespaceContext.reset();
                String systemId = domSource.getSystemId();
                fXMLLocator.setLiteralSystemId(systemId);
                fXMLLocator.setExpandedSystemId(systemId);
                fErrorReporter.setDocumentLocator(fXMLLocator);
                try {
                    // regardless of what type of node this is, fire start and end document events
                    setupEntityMap((node.getNodeType() == Node.DOCUMENT_NODE) ? (Document) node : node.getOwnerDocument());
                    setupDOMResultHandler(domSource, domResult);
                    fSchemaValidator.startDocument(fXMLLocator, null, fDOMNamespaceContext, null);
                    validate(node);
                    fSchemaValidator.endDocument(null);
                }
                catch (XMLParseException e) {
                    throw Util.toSAXParseException(e);
                }
                catch (XNIException e) {
                    throw Util.toSAXException(e);
                }
                finally {
                    // Release references to application objects
                    fRoot = null;
                    fCurrentElement = null;
                    fEntities = null;
                    if (fDOMValidatorHandler != null) {
                        fDOMValidatorHandler.setDOMResult(null);
                    }
                }
            }
            return;
        }
        throw new IllegalArgumentException(JAXPValidationMessageFormatter.formatMessage(Locale.getDefault(), 
                "SourceResultMismatch", 
                new Object [] {source.getClass().getName(), result.getClass().getName()}));
    }
    
    /*
     * EntityState methods
     */
    
    public boolean isEntityDeclared(String name) {
        return false;
    }
    
    public boolean isEntityUnparsed(String name) {
        if (fEntities != null) {
            Entity entity = (Entity) fEntities.getNamedItem(name);
            if (entity != null) {
                return (entity.getNotationName() != null);
            }
        }
        return false;
    }
    
    /*
     * Other methods
     */
    
    /** Traverse the DOM and fire events to the schema validator. */
    private void validate(Node node) {
        final Node top = node;
        // Performs a non-recursive traversal of the DOM. This
        // will avoid a stack overflow for DOMs with high depth.
        while (node != null) {
            beginNode(node);
            Node next = node.getFirstChild();
            while (next == null) {
                finishNode(node);           
                if (top == node) {
                    break;
                }
                next = node.getNextSibling();
                if (next == null) {
                    node = node.getParentNode();
                    if (node == null || top == node) {
                        if (node != null) {
                            finishNode(node);
                        }
                        next = null;
                        break;
                    }
                }
            }
            node = next;
        }
    }
    
    /** Do processing for the start of a node. */
    private void beginNode(Node node) {
        switch (node.getNodeType()) {
            case Node.ELEMENT_NODE:
                fCurrentElement = node;
                // push namespace context
                fNamespaceContext.pushContext();
                // start element
                fillQName(fElementQName, node);
                processAttributes(node.getAttributes());
                fSchemaValidator.startElement(fElementQName, fAttributes, null);
                break;
            case Node.TEXT_NODE:
                if (fDOMValidatorHandler != null) {
                    fDOMValidatorHandler.setIgnoringCharacters(true);
                    sendCharactersToValidator(node.getNodeValue());
                    fDOMValidatorHandler.setIgnoringCharacters(false);
                    fDOMValidatorHandler.characters((Text) node);
                }
                else {
                    sendCharactersToValidator(node.getNodeValue());
                }
                break;
            case Node.CDATA_SECTION_NODE:
                if (fDOMValidatorHandler != null) {
                    fDOMValidatorHandler.setIgnoringCharacters(true);
                    fSchemaValidator.startCDATA(null);
                    sendCharactersToValidator(node.getNodeValue());
                    fSchemaValidator.endCDATA(null);
                    fDOMValidatorHandler.setIgnoringCharacters(false);
                    fDOMValidatorHandler.cdata((CDATASection) node);
                }
                else {
                    fSchemaValidator.startCDATA(null);
                    sendCharactersToValidator(node.getNodeValue());