com.yahoo.metrics.simple.Identifier Maven / Gradle / Ivy

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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.simple;

/**
 * The name of the metric and its n-dimensional position. Basically a pair of a
 * Point and a metric name. Written to be robust against null input as the API
 * gives very little guidance, converting null to empty string/point.  Immutable.
 *
 * @author Steinar Knutsen
 */
public class Identifier {

    private final String name;
    private final Point location;
    private final int hashCode;

    public Identifier(String name, Point location) {
        this.name = (name == null ? "" : name);
        this.location = (location == null ? Point.emptyPoint() : location);
        this.hashCode = this.location.hashCode() * 31 + this.name.hashCode();
    }

    @Override
    public int hashCode() {
        return hashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;

        Identifier other = (Identifier) obj;
        return location.equals(other.location) && name.equals(other.name);
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("Identifier [name=").append(name).append(", location=").append(location).append("]");
        return builder.toString();
    }

    public String getName() {
        return name;
    }

    public Point getLocation() {
        return location;
    }

}