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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart
There is a newer version: 1.5.9
/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, TextBlockAnchor.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

package org.jfree.text;

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

/**
 * Used to indicate the position of an anchor point for a text block.
 *
 * @author David Gilbert
 */
public final class TextBlockAnchor implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -3045058380983401544L;
    
    /** Top/left. */
    public static final TextBlockAnchor TOP_LEFT 
        = new TextBlockAnchor("TextBlockAnchor.TOP_LEFT");

    /** Top/center. */
    public static final TextBlockAnchor TOP_CENTER = new TextBlockAnchor(
        "TextBlockAnchor.TOP_CENTER"
    );

    /** Top/right. */
    public static final TextBlockAnchor TOP_RIGHT = new TextBlockAnchor(
       "TextBlockAnchor.TOP_RIGHT"
    );

    /** Middle/left. */
    public static final TextBlockAnchor CENTER_LEFT = new TextBlockAnchor(
        "TextBlockAnchor.CENTER_LEFT"
    );

    /** Middle/center. */
    public static final TextBlockAnchor CENTER 
        = new TextBlockAnchor("TextBlockAnchor.CENTER");

    /** Middle/right. */
    public static final TextBlockAnchor CENTER_RIGHT = new TextBlockAnchor(
        "TextBlockAnchor.CENTER_RIGHT"
    );

    /** Bottom/left. */
    public static final TextBlockAnchor BOTTOM_LEFT 
        = new TextBlockAnchor("TextBlockAnchor.BOTTOM_LEFT");

    /** Bottom/center. */
    public static final TextBlockAnchor BOTTOM_CENTER 
        = new TextBlockAnchor("TextBlockAnchor.BOTTOM_CENTER");

    /** Bottom/right. */
    public static final TextBlockAnchor BOTTOM_RIGHT 
        = new TextBlockAnchor("TextBlockAnchor.BOTTOM_RIGHT");

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

    /**
     * Private constructor.
     *
     * @param name  the name.
     */
    private TextBlockAnchor(final String name) {
        this.name = name;
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */
    public String toString() {
        return this.name;
    }

    /**
     * Returns true if this object is equal to the specified 
     * object, and false otherwise.
     *
     * @param o  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(final Object o) {

        if (this == o) {
            return true;
        }
        if (!(o instanceof TextBlockAnchor)) {
            return false;
        }

        final TextBlockAnchor other = (TextBlockAnchor) o;
        if (!this.name.equals(other.name)) {
            return false;
        }

        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return the hashcode
     */
    public int hashCode() {
        return this.name.hashCode();
    }

    /**
     * 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(TextBlockAnchor.TOP_CENTER)) {
            return TextBlockAnchor.TOP_CENTER;
        }
        else if (this.equals(TextBlockAnchor.TOP_LEFT)) {
            return TextBlockAnchor.TOP_LEFT;
        }
        else if (this.equals(TextBlockAnchor.TOP_RIGHT)) {
            return TextBlockAnchor.TOP_RIGHT;
        }
        else if (this.equals(TextBlockAnchor.CENTER)) {
            return TextBlockAnchor.CENTER;
        }
        else if (this.equals(TextBlockAnchor.CENTER_LEFT)) {
            return TextBlockAnchor.CENTER_LEFT;
        }
        else if (this.equals(TextBlockAnchor.CENTER_RIGHT)) {
            return TextBlockAnchor.CENTER_RIGHT;
        }
        else if (this.equals(TextBlockAnchor.BOTTOM_CENTER)) {
            return TextBlockAnchor.BOTTOM_CENTER;
        }
        else if (this.equals(TextBlockAnchor.BOTTOM_LEFT)) {
            return TextBlockAnchor.BOTTOM_LEFT;
        }
        else if (this.equals(TextBlockAnchor.BOTTOM_RIGHT)) {
            return TextBlockAnchor.BOTTOM_RIGHT;
        }
        return null;
    }

}