org.jfree.data.datasetextension.impl.PieCursor.java Source code

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Here is the source code for org.jfree.data.datasetextension.impl.PieCursor.java

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package org.jfree.data.datasetextension.impl;

import org.jfree.data.datasetextension.DatasetCursor;

/**
 * A DatasetCursor implementation for pie datasets.
 * @author zinsmaie
 */
public class PieCursor implements DatasetCursor {

    /** a generated serial id    */
    private static final long serialVersionUID = -7031433882367850307L;

    /** stores the key of the section */
    public Comparable key;

    /**
     * creates a cursor without assigned position (the cursor will only
     * be valid if setPosition is called at some time)
     */
    public PieCursor() {
    }

    /**
     * Default pie cursor constructor. Sets the cursor position to the specified value.
     * @param key
     */
    public PieCursor(Comparable key) {
        this.key = key;
    }

    /**
     * sets the cursor position to the specified value
     * @param key
     */
    public void setPosition(Comparable key) {
        this.key = key;
    }

    //depend on the implementation of comparable
    //if the key overrides hashCode and equals these methods will function
    //for the cursor (e.g. String, Integer, ...)

    public int hashCode() {
        int result = 31 + ((key == null) ? 0 : key.hashCode());
        return result;
    }

    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        PieCursor other = (PieCursor) obj;
        if (key == null) {
            if (other.key != null)
                return false;
        } else if (!key.equals(other.key))
            return false;
        return true;
    }

}