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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.xerces.jaxp.validation;

import java.io.IOException;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Validator;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.util.SAXMessageFormatter;
import org.apache.xerces.xni.parser.XMLConfigurationException;
import org.apache.xerces.xs.AttributePSVI;
import org.apache.xerces.xs.ElementPSVI;
import org.apache.xerces.xs.PSVIProvider;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;

/**
 * Implementation of Validator for W3C XML Schemas.
 *
 * @author Kohsuke Kawaguchi
 * @author Michael Glavassevich, IBM
 * 
 * @version $Id: ValidatorImpl.java 713638 2008-11-13 04:42:18Z mrglavas $
 */
final class ValidatorImpl extends Validator implements PSVIProvider {
    
    // feature identifiers
    
    /** JAXP Source/Result feature prefix. */
    private static final String JAXP_SOURCE_RESULT_FEATURE_PREFIX = "http://javax.xml.transform";
    
    // property identifiers
    
    /** Property identifier: Current element node. */
    private static final String CURRENT_ELEMENT_NODE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.CURRENT_ELEMENT_NODE_PROPERTY;
    
    //
    // Data
    //
    
    /** Component manager. **/
    private final XMLSchemaValidatorComponentManager fComponentManager;
    
    /** SAX validator helper. **/
    private ValidatorHandlerImpl fSAXValidatorHelper;
    
    /** DOM validator helper. **/
    private DOMValidatorHelper fDOMValidatorHelper;
    
    /** StAX validator helper. **/
    private StAXValidatorHelper fStAXValidatorHelper;
    
    /** Stream validator helper. **/
    private StreamValidatorHelper fStreamValidatorHelper;
    
    /** Flag for tracking whether features/properties changed since last reset. */
    private boolean fConfigurationChanged = false;
    
    /** Flag for tracking whether the error handler changed since last reset. */
    private boolean fErrorHandlerChanged = false;
    
    /** Flag for tracking whether the resource resolver changed since last reset. */
    private boolean fResourceResolverChanged = false;
    
    public ValidatorImpl(XSGrammarPoolContainer grammarContainer) {
        fComponentManager = new XMLSchemaValidatorComponentManager(grammarContainer);
        setErrorHandler(null);
        setResourceResolver(null);
    }

    public void validate(Source source, Result result)
        throws SAXException, IOException {
        if (source instanceof SAXSource) {
            // Hand off to SAX validator helper.
            if (fSAXValidatorHelper == null) {
                fSAXValidatorHelper = new ValidatorHandlerImpl(fComponentManager);
            }
            fSAXValidatorHelper.validate(source, result);
        }
        else if (source instanceof DOMSource) {
            // Hand off to DOM validator helper.
            if (fDOMValidatorHelper == null) {
                fDOMValidatorHelper = new DOMValidatorHelper(fComponentManager);
            }
            fDOMValidatorHelper.validate(source, result);
        }
        else if (source instanceof StAXSource) {
            // Hand off to StAX validator helper.
            if (fStAXValidatorHelper == null) {
                fStAXValidatorHelper = new StAXValidatorHelper(fComponentManager);
            }
            fStAXValidatorHelper.validate(source, result);
        }
        else if (source instanceof StreamSource) {
            // Hand off to stream validator helper.
            if (fStreamValidatorHelper == null) {
                fStreamValidatorHelper = new StreamValidatorHelper(fComponentManager);
            }
            fStreamValidatorHelper.validate(source, result);
        }
        // Source parameter cannot be null.
        else if (source == null) {
            throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "SourceParameterNull", null));
        }
        // Source parameter must be a SAXSource, DOMSource or StreamSource
        else {
            throw new IllegalArgumentException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "SourceNotAccepted", new Object [] {source.getClass().getName()}));
        }
    }

    public void setErrorHandler(ErrorHandler errorHandler) {
        fErrorHandlerChanged = (errorHandler != null);
        fComponentManager.setErrorHandler(errorHandler);
    }

    public ErrorHandler getErrorHandler() {
        return fComponentManager.getErrorHandler();
    }

    public void setResourceResolver(LSResourceResolver resourceResolver) {
        fResourceResolverChanged = (resourceResolver != null);
        fComponentManager.setResourceResolver(resourceResolver);
    }

    public LSResourceResolver getResourceResolver() {
        return fComponentManager.getResourceResolver();
    }
    
    public boolean getFeature(String name) 
        throws SAXNotRecognizedException, SAXNotSupportedException {
        if (name == null) {
            throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "FeatureNameNull", null));
        }
        if (name.startsWith(JAXP_SOURCE_RESULT_FEATURE_PREFIX)) {
            // Indicates to the caller that this Validator supports a specific JAXP Source or Result.
            if (name.equals(StreamSource.FEATURE) ||
                name.equals(SAXSource.FEATURE) ||
                name.equals(DOMSource.FEATURE) ||
                name.equals(StAXSource.FEATURE) ||
                name.equals(StreamResult.FEATURE) ||
                name.equals(SAXResult.FEATURE) ||
                name.equals(DOMResult.FEATURE) ||
                name.equals(StAXResult.FEATURE)) {
                return true;
            }
        }
        try {
            return fComponentManager.getFeature(name);
        }
        catch (XMLConfigurationException e) {
            final String identifier = e.getIdentifier();
            if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "feature-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "feature-not-supported", new Object [] {identifier}));
            }
        }
    }
    
    public void setFeature(String name, boolean value)
        throws SAXNotRecognizedException, SAXNotSupportedException {
        if (name == null) {
            throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "FeatureNameNull", null));
        }
        if (name.startsWith(JAXP_SOURCE_RESULT_FEATURE_PREFIX)) {
            if (name.equals(StreamSource.FEATURE) ||
                name.equals(SAXSource.FEATURE) ||
                name.equals(DOMSource.FEATURE) ||
                name.equals(StAXSource.FEATURE) ||
                name.equals(StreamResult.FEATURE) ||
                name.equals(SAXResult.FEATURE) ||
                name.equals(DOMResult.FEATURE) ||
                name.equals(StAXResult.FEATURE)) {
                throw new SAXNotSupportedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "feature-read-only", new Object [] {name}));
            }
        }
        try {
            fComponentManager.setFeature(name, value);
        }
        catch (XMLConfigurationException e) {
            final String identifier = e.getIdentifier();
            if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "feature-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "feature-not-supported", new Object [] {identifier}));
            }
        }
        fConfigurationChanged = true;
    }
    
    public Object getProperty(String name)
        throws SAXNotRecognizedException, SAXNotSupportedException {
        if (name == null) {
            throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "ProperyNameNull", null));
        }
        if (CURRENT_ELEMENT_NODE.equals(name)) {
            return (fDOMValidatorHelper != null) ? 
                    fDOMValidatorHelper.getCurrentElement() : null;
        }
        try {
            return fComponentManager.getProperty(name);
        }
        catch (XMLConfigurationException e) {
            final String identifier = e.getIdentifier();
            if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "property-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "property-not-supported", new Object [] {identifier}));
            }
        }
    }
    
    public void setProperty(String name, Object object)
        throws SAXNotRecognizedException, SAXNotSupportedException {
        if (name == null) {
            throw new NullPointerException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "ProperyNameNull", null));
        }
        if (CURRENT_ELEMENT_NODE.equals(name)) {
            throw new SAXNotSupportedException(
                    SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                    "property-read-only", new Object [] {name}));
        }
        try {
            fComponentManager.setProperty(name, object);
        }
        catch (XMLConfigurationException e) {
            final String identifier = e.getIdentifier();
            if (e.getType() == XMLConfigurationException.NOT_RECOGNIZED) {
                throw new SAXNotRecognizedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "property-not-recognized", new Object [] {identifier}));
            }
            else {
                throw new SAXNotSupportedException(
                        SAXMessageFormatter.formatMessage(fComponentManager.getLocale(), 
                        "property-not-supported", new Object [] {identifier}));
            }
        }
        fConfigurationChanged = true;
    }
    
    public void reset() {
        // avoid resetting features and properties if the state the validator
        // is currently in, is the same as it will be after reset.
        if (fConfigurationChanged) {
            fComponentManager.restoreInitialState();
            setErrorHandler(null);
            setResourceResolver(null);
            fConfigurationChanged = false;
            fErrorHandlerChanged = false;
            fResourceResolverChanged = false;
        }
        else {
            if (fErrorHandlerChanged) {
                setErrorHandler(null);
                fErrorHandlerChanged = false;
            }
            if (fResourceResolverChanged) {
                setResourceResolver(null);
                fResourceResolverChanged = false;
            }
        }
    }
    
    /*
     * PSVIProvider methods
     */
    
    public ElementPSVI getElementPSVI() {
        return (fSAXValidatorHelper != null) ? fSAXValidatorHelper.getElementPSVI() : null;
    }
    
    public AttributePSVI getAttributePSVI(int index) {
        return (fSAXValidatorHelper != null) ? fSAXValidatorHelper.getAttributePSVI(index) : null;
    }
    
    public AttributePSVI getAttributePSVIByName(String uri, String localname) {
        return (fSAXValidatorHelper != null) ? fSAXValidatorHelper.getAttributePSVIByName(uri, localname) : null;
    }
    
} // ValidatorImpl