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jfreechart example source code file (SlidingGanttCategoryDataset.java)

This example jfreechart source code file (SlidingGanttCategoryDataset.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

clonenotsupportedexception, comparable, comparable, ganttcategorydataset, illegalargumentexception, list, number, number, publiccloneable, slidingganttcategorydataset, unknown, unknown, unknownkeyexception, unknownkeyexception, util

The jfreechart SlidingGanttCategoryDataset.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * --------------------------------
 * SlidingGanttCategoryDataset.java
 * --------------------------------
 * (C) Copyright 2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 09-May-2008 : Version 1 (DG);
 *
 */

package org.jfree.data.gantt;

import java.util.Collections;
import java.util.List;

import org.jfree.data.UnknownKeyException;
import org.jfree.data.general.AbstractDataset;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.util.PublicCloneable;

/**
 * A {@link GanttCategoryDataset} implementation that presents a subset of the
 * categories in an underlying dataset.  The index of the first "visible"
 * category can be modified, which provides a means of "sliding" through
 * the categories in the underlying dataset.
 *
 * @since 1.0.10
 */
public class SlidingGanttCategoryDataset extends AbstractDataset
        implements GanttCategoryDataset {

    /** The underlying dataset. */
    private GanttCategoryDataset underlying;

    /** The index of the first category to present. */
    private int firstCategoryIndex;

    /** The maximum number of categories to present. */
    private int maximumCategoryCount;

    /**
     * Creates a new instance.
     *
     * @param underlying  the underlying dataset (<code>null not
     *     permitted).
     * @param firstColumn  the index of the first visible column from the
     *     underlying dataset.
     * @param maxColumns  the maximumColumnCount.
     */
    public SlidingGanttCategoryDataset(GanttCategoryDataset underlying,
            int firstColumn, int maxColumns) {
        this.underlying = underlying;
        this.firstCategoryIndex = firstColumn;
        this.maximumCategoryCount = maxColumns;
    }

    /**
     * Returns the underlying dataset that was supplied to the constructor.
     *
     * @return The underlying dataset (never <code>null).
     */
    public GanttCategoryDataset getUnderlyingDataset() {
        return this.underlying;
    }

    /**
     * Returns the index of the first visible category.
     *
     * @return The index.
     *
     * @see #setFirstCategoryIndex(int)
     */
    public int getFirstCategoryIndex() {
        return this.firstCategoryIndex;
    }

    /**
     * Sets the index of the first category that should be used from the
     * underlying dataset, and sends a {@link DatasetChangeEvent} to all
     * registered listeners.
     *
     * @param first  the index.
     *
     * @see #getFirstCategoryIndex()
     */
    public void setFirstCategoryIndex(int first) {
        if (first < 0 || first >= this.underlying.getColumnCount()) {
            throw new IllegalArgumentException("Invalid index.");
        }
        this.firstCategoryIndex = first;
        fireDatasetChanged();
    }

    /**
     * Returns the maximum category count.
     *
     * @return The maximum category count.
     *
     * @see #setMaximumCategoryCount(int)
     */
    public int getMaximumCategoryCount() {
        return this.maximumCategoryCount;
    }

    /**
     * Sets the maximum category count and sends a {@link DatasetChangeEvent}
     * to all registered listeners.
     *
     * @param max  the maximum.
     *
     * @see #getMaximumCategoryCount()
     */
    public void setMaximumCategoryCount(int max) {
        if (max < 0) {
            throw new IllegalArgumentException("Requires 'max' >= 0.");
        }
        this.maximumCategoryCount = max;
        fireDatasetChanged();
    }

    /**
     * Returns the index of the last column for this dataset, or -1.
     *
     * @return The index.
     */
    private int lastCategoryIndex() {
        if (this.maximumCategoryCount == 0) {
            return -1;
        }
        return Math.min(this.firstCategoryIndex + this.maximumCategoryCount,
                this.underlying.getColumnCount()) - 1;
    }

    /**
     * Returns the index for the specified column key.
     *
     * @param key  the key.
     *
     * @return The column index, or -1 if the key is not recognised.
     */
    public int getColumnIndex(Comparable key) {
        int index = this.underlying.getColumnIndex(key);
        if (index >= this.firstCategoryIndex && index <= lastCategoryIndex()) {
            return index - this.firstCategoryIndex;
        }
        return -1;  // we didn't find the key
    }

    /**
     * Returns the column key for a given index.
     *
     * @param column  the column index (zero-based).
     *
     * @return The column key.
     *
     * @throws IndexOutOfBoundsException if <code>row is out of bounds.
     */
    public Comparable getColumnKey(int column) {
        return this.underlying.getColumnKey(column + this.firstCategoryIndex);
    }

    /**
     * Returns the column keys.
     *
     * @return The keys.
     *
     * @see #getColumnKey(int)
     */
    public List getColumnKeys() {
        List result = new java.util.ArrayList();
        int last = lastCategoryIndex();
        for (int i = this.firstCategoryIndex; i < last; i++) {
            result.add(this.underlying.getColumnKey(i));
        }
        return Collections.unmodifiableList(result);
    }

    /**
     * Returns the row index for a given key.
     *
     * @param key  the row key.
     *
     * @return The row index, or <code>-1 if the key is unrecognised.
     */
    public int getRowIndex(Comparable key) {
        return this.underlying.getRowIndex(key);
    }

    /**
     * Returns the row key for a given index.
     *
     * @param row  the row index (zero-based).
     *
     * @return The row key.
     *
     * @throws IndexOutOfBoundsException if <code>row is out of bounds.
     */
    public Comparable getRowKey(int row) {
        return this.underlying.getRowKey(row);
    }

    /**
     * Returns the row keys.
     *
     * @return The keys.
     */
    public List getRowKeys() {
        return this.underlying.getRowKeys();
    }

    /**
     * Returns the value for a pair of keys.
     *
     * @param rowKey  the row key (<code>null not permitted).
     * @param columnKey  the column key (<code>null not permitted).
     *
     * @return The value (possibly <code>null).
     *
     * @throws UnknownKeyException if either key is not defined in the dataset.
     */
    public Number getValue(Comparable rowKey, Comparable columnKey) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getValue(r, c + this.firstCategoryIndex);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the number of columns in the table.
     *
     * @return The column count.
     */
    public int getColumnCount() {
        int last = lastCategoryIndex();
        if (last == -1) {
            return 0;
        }
        else {
            return Math.max(last - this.firstCategoryIndex + 1, 0);
        }
    }

    /**
     * Returns the number of rows in the table.
     *
     * @return The row count.
     */
    public int getRowCount() {
        return this.underlying.getRowCount();
    }

    /**
     * Returns a value from the table.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The value (possibly <code>null).
     */
    public Number getValue(int row, int column) {
        return this.underlying.getValue(row, column + this.firstCategoryIndex);
    }

    /**
     * Returns the percent complete for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     *
     * @return The percent complete.
     */
    public Number getPercentComplete(Comparable rowKey, Comparable columnKey) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getPercentComplete(r,
                    c + this.firstCategoryIndex);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the percentage complete value of a sub-interval for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     * @param subinterval  the sub-interval.
     *
     * @return The percent complete value (possibly <code>null).
     *
     * @see #getPercentComplete(int, int, int)
     */
    public Number getPercentComplete(Comparable rowKey, Comparable columnKey,
            int subinterval) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getPercentComplete(r,
                    c + this.firstCategoryIndex, subinterval);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the end value of a sub-interval for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     * @param subinterval  the sub-interval.
     *
     * @return The end value (possibly <code>null).
     *
     * @see #getStartValue(Comparable, Comparable, int)
     */
    public Number getEndValue(Comparable rowKey, Comparable columnKey,
            int subinterval) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getEndValue(r,
                    c + this.firstCategoryIndex, subinterval);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the end value of a sub-interval for a given item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param subinterval  the sub-interval.
     *
     * @return The end value (possibly <code>null).
     *
     * @see #getStartValue(int, int, int)
     */
    public Number getEndValue(int row, int column, int subinterval) {
        return this.underlying.getEndValue(row,
                column + this.firstCategoryIndex, subinterval);
    }

    /**
     * Returns the percent complete for a given item.
     *
     * @param series  the row index (zero-based).
     * @param category  the column index (zero-based).
     *
     * @return The percent complete.
     */
    public Number getPercentComplete(int series, int category) {
        return this.underlying.getPercentComplete(series,
                category + this.firstCategoryIndex);
    }

    /**
     * Returns the percentage complete value of a sub-interval for a given item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param subinterval  the sub-interval.
     *
     * @return The percent complete value (possibly <code>null).
     *
     * @see #getPercentComplete(Comparable, Comparable, int)
     */
    public Number getPercentComplete(int row, int column, int subinterval) {
        return this.underlying.getPercentComplete(row,
                column + this.firstCategoryIndex, subinterval);
    }

    /**
     * Returns the start value of a sub-interval for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     * @param subinterval  the sub-interval.
     *
     * @return The start value (possibly <code>null).
     *
     * @see #getEndValue(Comparable, Comparable, int)
     */
    public Number getStartValue(Comparable rowKey, Comparable columnKey,
            int subinterval) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getStartValue(r,
                    c + this.firstCategoryIndex, subinterval);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the start value of a sub-interval for a given item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param subinterval  the sub-interval index (zero-based).
     *
     * @return The start value (possibly <code>null).
     *
     * @see #getEndValue(int, int, int)
     */
    public Number getStartValue(int row, int column, int subinterval) {
        return this.underlying.getStartValue(row,
                column + this.firstCategoryIndex, subinterval);
    }

    /**
     * Returns the number of sub-intervals for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     *
     * @return The sub-interval count.
     *
     * @see #getSubIntervalCount(int, int)
     */
    public int getSubIntervalCount(Comparable rowKey, Comparable columnKey) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getSubIntervalCount(r,
                    c + this.firstCategoryIndex);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the number of sub-intervals for a given item.
     *
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     *
     * @return The sub-interval count.
     *
     * @see #getSubIntervalCount(Comparable, Comparable)
     */
    public int getSubIntervalCount(int row, int column) {
        return this.underlying.getSubIntervalCount(row,
                column + this.firstCategoryIndex);
    }

    /**
     * Returns the start value for the interval for a given series and category.
     *
     * @param rowKey  the series key.
     * @param columnKey  the category key.
     *
     * @return The start value (possibly <code>null).
     *
     * @see #getEndValue(Comparable, Comparable)
     */
    public Number getStartValue(Comparable rowKey, Comparable columnKey) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getStartValue(r, c + this.firstCategoryIndex);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the start value for the interval for a given series and category.
     *
     * @param row  the series (zero-based index).
     * @param column  the category (zero-based index).
     *
     * @return The start value (possibly <code>null).
     *
     * @see #getEndValue(int, int)
     */
    public Number getStartValue(int row, int column) {
        return this.underlying.getStartValue(row,
                column + this.firstCategoryIndex);
    }

    /**
     * Returns the end value for the interval for a given series and category.
     *
     * @param rowKey  the series key.
     * @param columnKey  the category key.
     *
     * @return The end value (possibly <code>null).
     *
     * @see #getStartValue(Comparable, Comparable)
     */
    public Number getEndValue(Comparable rowKey, Comparable columnKey) {
        int r = getRowIndex(rowKey);
        int c = getColumnIndex(columnKey);
        if (c != -1) {
            return this.underlying.getEndValue(r, c + this.firstCategoryIndex);
        }
        else {
            throw new UnknownKeyException("Unknown columnKey: " + columnKey);
        }
    }

    /**
     * Returns the end value for the interval for a given series and category.
     *
     * @param series  the series (zero-based index).
     * @param category  the category (zero-based index).
     *
     * @return The end value (possibly <code>null).
     */
    public Number getEndValue(int series, int category) {
        return this.underlying.getEndValue(series,
                category + this.firstCategoryIndex);
    }

    /**
     * Tests this <code>SlidingCategoryDataset for equality with an
     * arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof SlidingGanttCategoryDataset)) {
            return false;
        }
        SlidingGanttCategoryDataset that = (SlidingGanttCategoryDataset) obj;
        if (this.firstCategoryIndex != that.firstCategoryIndex) {
            return false;
        }
        if (this.maximumCategoryCount != that.maximumCategoryCount) {
            return false;
        }
        if (!this.underlying.equals(that.underlying)) {
            return false;
        }
        return true;
    }

    /**
     * Returns an independent copy of the dataset.  Note that:
     * <ul>
     * <li>the underlying dataset is only cloned if it implements the
     * {@link PublicCloneable} interface;</li>
     * <li>the listeners registered with this dataset are not carried over to
     * the cloned dataset.</li>
     * </ul>
     *
     * @return An independent copy of the dataset.
     *
     * @throws CloneNotSupportedException if the dataset cannot be cloned for
     *         any reason.
     */
    public Object clone() throws CloneNotSupportedException {
        SlidingGanttCategoryDataset clone
                = (SlidingGanttCategoryDataset) super.clone();
        if (this.underlying instanceof PublicCloneable) {
            PublicCloneable pc = (PublicCloneable) this.underlying;
            clone.underlying = (GanttCategoryDataset) pc.clone();
        }
        return clone;
    }

}

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