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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.codelibs.elasticsearch.taste.common;

public final class InvertedRunningAverage implements RunningAverage {

    private final RunningAverage delegate;

    public InvertedRunningAverage(final RunningAverage delegate) {
        this.delegate = delegate;
    }

    @Override
    public void addDatum(final double datum) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void removeDatum(final double datum) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void changeDatum(final double delta) {
        throw new UnsupportedOperationException();
    }

    @Override
    public int getCount() {
        return delegate.getCount();
    }

    @Override
    public double getAverage() {
        return -delegate.getAverage();
    }

    @Override
    public RunningAverage inverse() {
        return delegate;
    }

}