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 * 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.

 *

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

import javax.xml.namespace.NamespaceContext;

import javax.xml.validation.Schema;

import javax.xml.validation.ValidatorHandler;

import com.sun.xml.internal.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<len) {

            buf = new char[len];

        }

        for( int i=0;i<len; i++ )

            buf[i] = pcdata.charAt(i);  // isn't this kinda slow?

        validator.characters(buf,0,len);

        if(predictor.expectText())

            next.text(pcdata);

    }

    public UnmarshallingContext getContext() {

        return next.getContext();

    }

    public TextPredictor getPredictor() {

        return this;

    }

    // should be always invoked through TextPredictor

    @Deprecated

    public boolean expectText() {

        // validator needs to make sure that there's no text

        // even when it's not expected. So always have them

        // send text, ignoring optimization hints from the unmarshaller

        return true;

    }

}