ItemPointer.java

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.dcm4che3.data;

import java.io.Serializable;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 */
public class ItemPointer implements Serializable {

    private static final long serialVersionUID = 5183950023496022964L;

    public final int sequenceTag;
    public final String privateCreator;
    public final int itemIndex;

    public ItemPointer(int sequenceTag) {
        this(null, sequenceTag, 0);
    }

    public ItemPointer(int sequenceTag, int itemIndex) {
        this(null, sequenceTag, itemIndex);
    }

    public ItemPointer(String privateCreator, int sequenceTag) {
        this(privateCreator, sequenceTag, 0);
    }

    public ItemPointer(String privateCreator, int sequenceTag, int itemIndex) {
        this.sequenceTag = sequenceTag;
        this.privateCreator = privateCreator;
        this.itemIndex = itemIndex;
    }

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

        ItemPointer that = (ItemPointer) o;

        if (itemIndex != that.itemIndex) return false;
        if (sequenceTag != that.sequenceTag) return false;
        if (privateCreator != null ? !privateCreator.equals(that.privateCreator) : that.privateCreator != null)
            return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = sequenceTag;
        result = 31 * result + (privateCreator != null ? privateCreator.hashCode() : 0);
        result = 31 * result + itemIndex;
        return result;
    }
}