/*****************************************************************
 *   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.cayenne.remote.hessian.service;

import java.io.IOException;

import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.query.AbstractQuery;

import com.caucho.hessian.io.AbstractHessianInput;
import com.caucho.hessian.io.JavaDeserializer;

/**
 * Deserializer that overrides query roots with server classes on deserialization.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
class ServerAbstractQueryDeserializer extends JavaDeserializer {

    private EntityResolver clientResolver;

    ServerAbstractQueryDeserializer(Class cl, EntityResolver clientResolver) {
        super(cl);

        this.clientResolver = clientResolver;
    }

    public Object readMap(AbstractHessianInput in) throws IOException {
        Object object = super.readMap(in);

        if (object instanceof AbstractQuery) {

            AbstractQuery abstractClientQuery = (AbstractQuery) object;
            Object root = abstractClientQuery.getRoot();
            if (root instanceof Class) {
                ObjEntity entity = clientResolver.lookupObjEntity((Class) root);
                if (entity == null) {
                    throw new CayenneRuntimeException("Unmapped client class: " + root);
                }
                abstractClientQuery.setRoot(entity.getName());
            }
        }

        return object;
    }
}
