/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.xml.internal.ws.client;

import com.sun.xml.internal.ws.api.WSBinding;
import com.sun.xml.internal.ws.api.message.Packet;
import com.sun.xml.internal.ws.api.model.wsdl.WSDLPort;
import com.sun.xml.internal.ws.api.pipe.NextAction;
import com.sun.xml.internal.ws.api.pipe.Tube;
import com.sun.xml.internal.ws.api.pipe.TubeCloner;
import com.sun.xml.internal.ws.api.pipe.helper.AbstractTubeImpl;
import com.sun.xml.internal.ws.api.server.SDDocument;
import com.sun.xml.internal.ws.api.server.SDDocumentSource;
import com.sun.xml.internal.ws.util.MetadataUtil;
import com.sun.xml.internal.ws.util.pipe.AbstractSchemaValidationTube;
import com.sun.xml.internal.ws.util.xml.MetadataDocument;
import org.xml.sax.SAXException;

import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.transform.Source;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import javax.xml.ws.WebServiceException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

/**
 * {@link Tube} that does the schema validation on the client side.
 *
 * @author Jitendra Kotamraju
 */
public class ClientSchemaValidationTube extends AbstractSchemaValidationTube {

    private static final Logger LOGGER = Logger.getLogger(ClientSchemaValidationTube.class.getName());

    private final Schema schema;
    private final Validator validator;
    private final boolean noValidation;
    private final WSDLPort port;

    public ClientSchemaValidationTube(WSBinding binding, WSDLPort port, Tube next) {
        super(binding, next);
        this.port = port;
        Source[] sources = null;
        if (port != null) {
            String primaryWsdl = port.getOwner().getParent().getLocation().getSystemId();
            sources = getSchemaSources(primaryWsdl);
            for(Source source : sources) {
                LOGGER.fine("Constructing validation Schema from = "+source.getSystemId());
                //printDOM((DOMSource)source);
            }
        }
        if (sources != null) {
            noValidation = false;
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            try {
                sf.setFeature(HONOUR_ALL_SCHEMA_LOCATIONS_ID, true);
            } catch(Exception e) {
                // xerces 2.7 supports this feature. So just ignore the exception.
            }
            try {
                schema = sf.newSchema(sources);
            } catch(SAXException e) {
                throw new WebServiceException(e);
            }
            validator = schema.newValidator();
            try {
                validator.setFeature(HONOUR_ALL_SCHEMA_LOCATIONS_ID, true);
            } catch(Exception e) {
                // xerces 2.7 supports this feature. So just ignore the exception.
            }
        } else {
            noValidation = true;
            schema = null;
            validator = null;
        }
    }

    private class MetadataResolverImpl implements MetadataUtil.MetadataResolver{

        Map<String, SDDocument> docs = new HashMap<String, SDDocument>();

        public SDDocument resolveEntity(String systemId) {
            SDDocument sdi = docs.get(systemId);
            if (sdi == null) {
                SDDocumentSource sds;
                try {
                    sds = SDDocumentSource.create(new URL(systemId));
                } catch(MalformedURLException e) {
                    throw new WebServiceException(e);
                }
                sdi = MetadataDocument.create(sds, new QName(""), new QName(""));
                docs.put(systemId, sdi);
            }
            return sdi;
        }
    }

    private Source[] getSchemaSources(String primary) {
        MetadataUtil.MetadataResolver mdresolver = new MetadataResolverImpl();
        return super.getSchemaSources(primary, mdresolver);
    }

    protected Validator getValidator() {
        return validator;
    }

    protected boolean isNoValidation() {
        return noValidation;
    }

    protected ClientSchemaValidationTube(ClientSchemaValidationTube that, TubeCloner cloner) {
        super(that,cloner);
        this.port = that.port;
        this.schema = that.schema;
        this.validator = schema.newValidator();
        this.noValidation = that.noValidation;
    }

    public AbstractTubeImpl copy(TubeCloner cloner) {
        return new ClientSchemaValidationTube(this,cloner);
    }

    @Override
    public NextAction processRequest(Packet request) {
        if (isNoValidation() || !request.getMessage().hasPayload() || request.getMessage().isFault()) {
            return super.processRequest(request);
        }
        try {
            doProcess(request);
        } catch(SAXException se) {
            throw new WebServiceException(se);
        }
        return super.processRequest(request);
    }

    @Override
    public NextAction processResponse(Packet response) {
        if (isNoValidation() || response.getMessage() == null || !response.getMessage().hasPayload() || response.getMessage().isFault()) {
            return super.processResponse(response);
        }
        try {
            doProcess(response);
        } catch(SAXException se) {
            throw new WebServiceException(se);
        }
        return super.processResponse(response);
    }

}