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

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

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package org.jfree.data.datasetextension.impl;

import org.jfree.data.datasetextension.DatasetCursor;

/**
 * A DatasetCursor implementation for category datasets.
 * @author zinsmaie
 */
public class CategoryCursor implements DatasetCursor {

    /** a generated serial id. */
    private static final long serialVersionUID = 7086987028899208483L;

    /** stores the key of the row position */
    public Comparable rowKey;

    /** stores the key of the column position */
    public Comparable columnKey;

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

    /**
     * Default category cursor constructor. Sets the cursor position to the specified values.
     * @param rowKey
     * @param columnKey
     */
    public CategoryCursor(Comparable rowKey, Comparable columnKey) {
        this.rowKey = rowKey;
        this.columnKey = columnKey;
    }

    /**
     * sets the cursor position to the specified values
     * @param rowKey
     * @param columnKey
     */
    public void setPosition(Comparable rowKey, Comparable columnKey) {
        this.rowKey = rowKey;
        this.columnKey = columnKey;
    }

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

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

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

}