/*
 * 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.metadata.filter;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;

import org.apache.kylin.common.util.BytesUtil;
import org.apache.kylin.metadata.tuple.IEvaluatableTuple;

/**
 * 
 * @author xjiang
 * 
 */
public class DynamicTupleFilter extends TupleFilter {

    private String variableName;

    public DynamicTupleFilter(String name) {
        super(Collections.<TupleFilter> emptyList(), FilterOperatorEnum.DYNAMIC);
        this.variableName = name;
    }

    public String getVariableName() {
        return variableName;
    }

    @Override
    public void addChild(TupleFilter child) {
        throw new UnsupportedOperationException("This is " + this + " and child is " + child);
    }

    @Override
    public String toString() {
        return "DynamicFilter [variableName=" + variableName + "]";
    }

    @Override
    public boolean evaluate(IEvaluatableTuple tuple, IFilterCodeSystem<?> cs) {
        return true;
    }

    @Override
    public boolean isEvaluable() {
        return true;
    }

    @Override
    public Collection<?> getValues() {
        return Collections.emptyList();
    }

    @Override
    public void serialize(IFilterCodeSystem<?> cs, ByteBuffer buffer) {
        BytesUtil.writeUTFString(variableName, buffer);
    }

    @Override
    public void deserialize(IFilterCodeSystem<?> cs, ByteBuffer buffer) {
        this.variableName = BytesUtil.readUTFString(buffer);
    }

}
