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CategoryAnchor.java
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CategoryAnchor.java
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/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2020, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -------------------
* CategoryAnchor.java
* -------------------
* (C) Copyright 2003-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* 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 MIDDLE} and {@code END}.
*/
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.
*/
@Override
public String toString() {
return this.name;
}
/**
* Returns {@code true} if this object is equal to the specified
* object, and {@code false} otherwise.
*
* @param obj the other object.
*
* @return A boolean.
*/
@Override
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;
}
}