/*
 * 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.kylin.stream.core.util;

import java.nio.ByteBuffer;

import org.apache.kylin.common.util.ByteArray;
import org.apache.kylin.common.util.BytesUtil;
import org.apache.kylin.dimension.DimensionEncoding;
import org.apache.kylin.metadata.filter.IFilterCodeSystem;

public class StreamFilterUtil {

    public static IFilterCodeSystem<ByteArray> getStreamingFilterCodeSystem() {
        return new IFilterCodeSystem<ByteArray>() {
            @Override
            public int compare(ByteArray o1, ByteArray o2) {
                return o1.compareTo(o2);
            }

            @Override
            public boolean isNull(ByteArray code) {
                return DimensionEncoding.isNull(code.array(), code.offset(), code.length());
            }

            @Override
            public void serialize(ByteArray code, ByteBuffer buffer) {
                if (code == null)
                    BytesUtil.writeByteArray(null, 0, 0, buffer);
                else
                    BytesUtil.writeByteArray(code.array(), code.offset(), code.length(), buffer);
            }

            @Override
            public ByteArray deserialize(ByteBuffer buffer) {
                return new ByteArray(BytesUtil.readByteArray(buffer));
            }
        };
    }
}
