/*
 * 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.ignite.internal.processors.hadoop.impl.v2;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.mapreduce.Counter;
import org.apache.ignite.internal.processors.hadoop.counter.HadoopLongCounter;

/**
 * Adapter from own counter implementation into Hadoop API Counter od version 2.0.
 */
public class HadoopV2Counter implements Counter {
    /** Delegate. */
    private final HadoopLongCounter cntr;

    /**
     * Creates new instance with given delegate.
     *
     * @param cntr Internal counter.
     */
    public HadoopV2Counter(HadoopLongCounter cntr) {
        assert cntr != null : "counter must be non-null";

        this.cntr = cntr;
    }

    /** {@inheritDoc} */
    @Override public void setDisplayName(String displayName) {
        // No-op.
    }

    /** {@inheritDoc} */
    @Override public String getName() {
        return cntr.name();
    }

    /** {@inheritDoc} */
    @Override public String getDisplayName() {
        return getName();
    }

    /** {@inheritDoc} */
    @Override public long getValue() {
        return cntr.value();
    }

    /** {@inheritDoc} */
    @Override public void setValue(long val) {
        cntr.value(val);
    }

    /** {@inheritDoc} */
    @Override public void increment(long incr) {
        cntr.increment(incr);
    }

    /** {@inheritDoc} */
    @Override public Counter getUnderlyingCounter() {
        return this;
    }

    /** {@inheritDoc} */
    @Override public void write(DataOutput out) throws IOException {
        throw new UnsupportedOperationException("not implemented");
    }

    /** {@inheritDoc} */
    @Override public void readFields(DataInput in) throws IOException {
        throw new UnsupportedOperationException("not implemented");
    }
}
