/*
 * 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.shardingsphere.proxy.frontend.firebird.command.query.blob.executors;

import lombok.RequiredArgsConstructor;
import org.apache.shardingsphere.database.protocol.firebird.packet.command.query.blob.FirebirdBlobRegistry;
import org.apache.shardingsphere.database.protocol.firebird.packet.command.query.blob.FirebirdOpenBlobCommandPacket;
import org.apache.shardingsphere.database.protocol.firebird.packet.generic.FirebirdGenericResponsePacket;
import org.apache.shardingsphere.database.protocol.firebird.packet.command.query.statement.execute.protocol.FirebirdBlobBinaryProtocolValue;
import org.apache.shardingsphere.database.protocol.packet.DatabasePacket;
import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
import org.apache.shardingsphere.proxy.frontend.command.executor.CommandExecutor;
import org.apache.shardingsphere.proxy.frontend.firebird.command.query.statement.FirebirdStatementIdGenerator;

import java.util.Collection;
import java.util.Collections;

/**
 * Open blob command executor for Firebird.
 */
@RequiredArgsConstructor
public final class FirebirdOpenBlobCommandExecutor implements CommandExecutor {
    
    private final FirebirdOpenBlobCommandPacket packet;
    
    private final ConnectionSession connectionSession;
    
    @Override
    public Collection<DatabasePacket> execute() {
        byte[] blobContent = FirebirdBlobBinaryProtocolValue.getBlobContent(packet.getBlobId());
        FirebirdBlobRegistry.setSegment(blobContent == null ? new byte[0] : blobContent);
        int statementId = FirebirdStatementIdGenerator.getInstance().nextStatementId(connectionSession.getConnectionId());
        return Collections.singleton(new FirebirdGenericResponsePacket().setHandle(statementId).setId(packet.getBlobId()));
    }
}
