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Cayenne Object Persistence Framework

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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;
    }
}