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File org.jfree.chart.axis.CategoryAnchor.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -------------------
 * CategoryAnchor.java
 * -------------------
 * (C) Copyright 2003-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: CategoryAnchor.java,v 1.4.2.1 2005/10/25 20:37:34 mungady Exp $
 *
 * Changes:
 * --------
 * 04-Jul-2003 : Version 1 (DG);
 *
 */


package org.jfree.chart.axis;

import java.io.ObjectStreamException;
import java.io.Serializable;

/**
 * Used to indicate one of three positions within a category: 
 * <code>START</code>, <code>MIDDLE</code> and <code>END</code>.
 */

public final class CategoryAnchor implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -2604142742210173810L;
    
    /** Start of period. */
    public static final CategoryAnchor START 
        = new CategoryAnchor("CategoryAnchor.START");

    /** Middle of period. */
    public static final CategoryAnchor MIDDLE 
        = new CategoryAnchor("CategoryAnchor.MIDDLE");

    /** End of period. */
    public static final CategoryAnchor END 
        = new CategoryAnchor("CategoryAnchor.END");

    /** The name. */
    private String name;

    /**
     * Private constructor.
     *
     * @param name  the name.
     */

    private CategoryAnchor(String name) {
        this.name = name;
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */

    public String toString() {
        return this.name;
    }

    /**
     * Returns <code>true</code> if this object is equal to the specified 
     * object, and <code>false</code> otherwise.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */

    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }
        if (!(obj instanceof CategoryAnchor)) {
            return false;
        }
        CategoryAnchor position = (CategoryAnchor) obj;
        if (!this.name.equals(position.toString())) {
            return false;
        }
        return true;

    }
    
    /**
     * Ensures that serialization returns the unique instances.
     * 
     * @return The object.
     * 
     * @throws ObjectStreamException if there is a problem.
     */

    private Object readResolve() throws ObjectStreamException {
        if (this.equals(CategoryAnchor.START)) {
            return CategoryAnchor.START;
        }
        else if (this.equals(CategoryAnchor.MIDDLE)) {
            return CategoryAnchor.MIDDLE;
        }    
        else if (this.equals(CategoryAnchor.END)) {
            return CategoryAnchor.END;
        }    
        return null;
    }

}

File Information:

file name:CategoryAnchor.java
package:org.jfree.chart.axis
qualified name:org.jfree.chart.axis.CategoryAnchor.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/jfree/chart/axis/CategoryAnchor.java
size:3.941 KB (4036 B)
uploaded: 2012-05-02 03:11:07 GMT+0000
last update: 2006-08-25 12:16:42 GMT+0000
last access: 2012-11-29 23:29:30 GMT+0000

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