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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.bind.v2.runtime.unmarshaller;

import javax.xml.namespace.NamespaceContext;
import javax.xml.validation.Schema;
import javax.xml.validation.ValidatorHandler;

import com.sun.xml.bind.v2.util.FatalAdapter;

import org.xml.sax.SAXException;

/**
 * {@link XmlVisitor} decorator that validates the events by using JAXP validation API.
 *
 * @author Kohsuke Kawaguchi
 */
final class ValidatingUnmarshaller implements XmlVisitor, XmlVisitor.TextPredictor {
    
    private final XmlVisitor next;
    private final ValidatorHandler validator;
    private NamespaceContext nsContext = null;

    /**
     * {@link TextPredictor} of the next {@link XmlVisitor}.
     */
    private final TextPredictor predictor;

    private char[] buf = new char[256];

    /**
     * Creates a new instance of ValidatingUnmarshaller.
     */
    public ValidatingUnmarshaller( Schema schema, XmlVisitor next ) {
        this.validator = schema.newValidatorHandler();
        this.next = next;
        this.predictor = next.getPredictor();
        // if the user bothers to use a validator, make validation errors fatal
        // so that it will abort unmarshalling.
        validator.setErrorHandler(new FatalAdapter(getContext()));
    }

    public void startDocument(LocatorEx locator, NamespaceContext nsContext) throws SAXException {
        this.nsContext = nsContext;
        validator.setDocumentLocator(locator);
        validator.startDocument();
        next.startDocument(locator,nsContext);
    }

    public void endDocument() throws SAXException {
        this.nsContext = null;
        validator.endDocument();
        next.endDocument();
    }

    public void startElement(TagName tagName) throws SAXException {
        if(nsContext != null) {
            String tagNamePrefix = tagName.getPrefix().intern();
            if(tagNamePrefix != "") {
                validator.startPrefixMapping(tagNamePrefix, nsContext.getNamespaceURI(tagNamePrefix));
            }
        }
        validator.startElement(tagName.uri,tagName.local,tagName.getQname(),tagName.atts);
        next.startElement(tagName);
    }

    public void endElement(TagName tagName ) throws SAXException {
        validator.endElement(tagName.uri,tagName.local,tagName.getQname());
        next.endElement(tagName);
    }

    public void startPrefixMapping(String prefix, String nsUri) throws SAXException {
        validator.startPrefixMapping(prefix,nsUri);
        next.startPrefixMapping(prefix,nsUri);
    }

    public void endPrefixMapping(String prefix) throws SAXException {
        validator.endPrefixMapping(prefix);
        next.endPrefixMapping(prefix);
    }

    public void text( CharSequence pcdata ) throws SAXException {
        int len = pcdata.length();
        if(buf.length