com.clearspring.analytics.stream.ScoredItem Maven / Gradle / Ivy

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A library for summarizing data in streams for which it is infeasible to store all events

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/*
 * Copyright (C) 2011 Clearspring Technologies, Inc. 
 *
 * Licensed 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 com.clearspring.analytics.stream;

import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;

/**
 * @author Eric Vlaanderen
 */
public class ScoredItem implements Comparable> {

    private final AtomicLong error;
    private final AtomicLong count;
    private final AtomicBoolean newItem;
    private final T item;

    public ScoredItem(final T item, final long count, final long error) {
        this.item = item;
        this.error = new AtomicLong(error);
        this.count = new AtomicLong(count);
        this.newItem = new AtomicBoolean(true);
    }

    public ScoredItem(final T item, final long count) {
        this(item, count, 0L);
    }

    public long addAndGetCount(final long delta) {
        return this.count.addAndGet(delta);
    }

    public void setError(final long newError) {
        this.error.set(newError);
    }

    public long getError() {
        return error.get();
    }

    public T getItem() {
        return item;
    }

    public boolean isNewItem() {
        return newItem.get();
    }

    public long getCount() {
        return count.get();
    }

    @Override
    public int compareTo(final ScoredItem o) {
        long x = o.count.get();
        long y = count.get();
        return (x < y) ? -1 : ((x == y) ? 0 : 1);
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("Value: ");
        sb.append(item);
        sb.append(", Count: ");
        sb.append(count);
        sb.append(", Error: ");
        sb.append(error);
        sb.append(", object: ");
        sb.append(super.toString());
        return sb.toString();
    }


    public void setNewItem(final boolean newItem) {
        this.newItem.set(newItem);
    }
}