org.commonjava.shelflife.model.ExpirationKey.java Source code

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Here is the source code for org.commonjava.shelflife.model.ExpirationKey.java

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/*******************************************************************************
 * Copyright (c) 2014 Red Hat, Inc..
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.commonjava.shelflife.model;

import static org.apache.commons.lang.StringUtils.join;

import java.io.Serializable;
import java.util.Arrays;

public class ExpirationKey implements Serializable, Comparable<ExpirationKey> {

    private static final long serialVersionUID = 1L;

    private final String[] parts;

    public ExpirationKey(final String firstPart, final String... parts) {
        if (firstPart == null) {
            throw new NullPointerException();
        }

        final String[] all = new String[parts.length + 1];
        all[0] = firstPart;
        System.arraycopy(parts, 0, all, 1, parts.length);

        this.parts = all;
    }

    public String[] getParts() {
        final String[] result = new String[parts.length];
        System.arraycopy(parts, 0, result, 0, parts.length);

        return result;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result;

        int idx = 1;
        for (final String part : parts) {
            result += part.hashCode() / idx++;
        }

        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final ExpirationKey other = (ExpirationKey) obj;
        if (!Arrays.equals(parts, other.parts)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return join(parts, ":");
    }

    @Override
    public int compareTo(final ExpirationKey other) {
        int comp = 0;

        int i = 0;
        for (; comp == 0 && i < parts.length; i++) {
            final String part = parts[i];
            if (other.parts.length > i) {
                comp = part.compareTo(other.parts[i]);
            } else {
                comp = 1;
                break;
            }
        }

        if (comp == 0 && parts.length < other.parts.length) {
            comp = -1;
        }

        return comp;
    }

}