org.springframework.analytics.rest.domain.FieldValueCounterResource.java Source code

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Here is the source code for org.springframework.analytics.rest.domain.FieldValueCounterResource.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 org.springframework.analytics.rest.domain;

import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;

import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * The REST representation of a Field Value Counter.
 *
 * @author Eric Bottard
 */
public class FieldValueCounterResource extends MetricResource {

    /**
     * The values for the counter.
     */
    private Map<String, Double> values;

    /**
     * No-arg constructor for serialization frameworks.
     */
    protected FieldValueCounterResource() {

    }

    public FieldValueCounterResource(String name, Map<String, Double> values) {
        super(name);
        setValues(values);
    }

    /**
     * Return the values for the counter.
     */
    public Map<String, Double> getValues() {
        return values;
    }

    @JsonProperty
    public void setValues(Map<String, Double> values) {
        this.values = new TreeMap<>(new ByDecreasingValueComparator(values));
        this.values.putAll(values);
    }

    /**
     * A comparator on map keys that orders them according to their mapped value.
     *
     * @author Eric Bottard
     */
    private static class ByDecreasingValueComparator implements Comparator<String> {

        private final Map<String, Double> values;

        private ByDecreasingValueComparator(Map<String, Double> values) {
            this.values = values;
        }

        @Override
        public int compare(String k1, String k2) {
            int byValue = values.get(k1).compareTo(values.get(k2));
            return byValue == 0 ? k1.compareTo(k2) : -byValue;
        }
    }
}