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 *  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
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 *  KIND, either express or implied.  See the License for the
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package org.apache.cayenne.remote;

import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.query.Query;
import org.apache.cayenne.query.QueryMetadata;
import org.apache.cayenne.query.QueryMetadataProxy;
import org.apache.cayenne.query.QueryRouter;
import org.apache.cayenne.query.SQLAction;
import org.apache.cayenne.query.SQLActionVisitor;

/**
 * A client wrapper for the incremental query that overrides the metadata to ensure that
 * query result is cached on the server, so that subranges could be retrieved at a later
 * time.
 * 
 * @since 1.2
 */
class IncrementalQuery implements Query {

    private Query query;
    private String cacheKey;

    IncrementalQuery(Query query, String cacheKey) {
        this.query = query;
        this.cacheKey = cacheKey;
    }

    public QueryMetadata getMetaData(EntityResolver resolver) {
        final QueryMetadata metadata = query.getMetaData(resolver);

        // the way paginated queries work on the server is that they are never cached
        // (IncrementalFaultList interception happens before cache interception). So
        // overriding caching settings in the metadata will only affect
        // ClientServerChannel behavior
        return new QueryMetadataProxy(metadata) {
            public Query getOriginatingQuery() {
                return null;
            }

            public String getCacheKey() {
                return cacheKey;
            }
        };
    }

    public void route(QueryRouter router, EntityResolver resolver, Query substitutedQuery) {
        query.route(router, resolver, substitutedQuery);
    }

    public SQLAction createSQLAction(SQLActionVisitor visitor) {
        return query.createSQLAction(visitor);
    }

    @Deprecated
    public String getName() {
        return query.getName();
    }

    /**
     * @since 3.1
     * @deprecated since 4.0
     */
    @Deprecated
    public DataMap getDataMap() {
        return query.getDataMap();
    }
}