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/*
 * 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.phoenix.compile;

import java.sql.SQLException;
import java.util.Collections;

import org.apache.phoenix.execute.MutationState;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.jdbc.PhoenixStatement;
import org.apache.phoenix.parse.CreateFunctionStatement;
import org.apache.phoenix.schema.MetaDataClient;

public class CreateFunctionCompiler {

    private final PhoenixStatement statement;
    
    public CreateFunctionCompiler(PhoenixStatement statement) {
        this.statement = statement;
    }

    public MutationPlan compile(final CreateFunctionStatement create) throws SQLException {
        final PhoenixConnection connection = statement.getConnection();
        PhoenixConnection connectionToBe = connection;
        final StatementContext context = new StatementContext(statement);
        final MetaDataClient client = new MetaDataClient(connectionToBe);
        
        return new BaseMutationPlan(context, create.getOperation()) {

            @Override
            public MutationState execute() throws SQLException {
                try {
                    return client.createFunction(create);
                } finally {
                    if (client.getConnection() != connection) {
                        client.getConnection().close();
                    }
                }
            }

            @Override
            public ExplainPlan getExplainPlan() throws SQLException {
                return new ExplainPlan(Collections.singletonList("CREATE"
                        + (create.getFunctionInfo().isReplace() ? " OR REPLACE" : "")
                        + " FUNCTION"));
            }

            @Override
            public StatementContext getContext() {
                return context;
            }
        };
    }
}