Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2012, 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.] * * --------------------------- * DefaultCategoryDataset.java * --------------------------- * (C) Copyright 2002-2012, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * Changes * ------- * 21-Jan-2003 : Added standard header, and renamed DefaultCategoryDataset (DG); * 13-Mar-2003 : Inserted DefaultKeyedValues2DDataset into class hierarchy (DG); * 06-Oct-2003 : Added incrementValue() method (DG); * 05-Apr-2004 : Added clear() method (DG); * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.category (DG); * ------------- JFREECHART 1.0.x --------------------------------------------- * 26-Feb-2007 : Updated API docs (DG); * 08-Mar-2007 : Implemented clone() (DG); * 09-May-2008 : Implemented PublicCloneable (DG); * 17-Jun-2012 : Removed JCommon dependencies (DG); * */ package org.jfree.data.category; import java.io.Serializable; import java.util.List; import org.jfree.chart.util.PublicCloneable; import org.jfree.data.DefaultKeyedValues2D; import org.jfree.data.UnknownKeyException; import org.jfree.data.general.AbstractDataset; import org.jfree.data.general.DatasetChangeEvent; /** * A default implementation of the {@link CategoryDataset} interface. */ public class DefaultCategoryDataset extends AbstractDataset implements CategoryDataset, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = -8168173757291644622L; /** A storage structure for the data. */ private DefaultKeyedValues2D data; /** * Creates a new (empty) dataset. */ public DefaultCategoryDataset() { this.data = new DefaultKeyedValues2D(); } /** * Returns the number of rows in the table. * * @return The row count. * * @see #getColumnCount() */ @Override public int getRowCount() { return this.data.getRowCount(); } /** * Returns the number of columns in the table. * * @return The column count. * * @see #getRowCount() */ @Override public int getColumnCount() { return this.data.getColumnCount(); } /** * 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</code>). * * @see #addValue(Number, Comparable, Comparable) * @see #removeValue(Comparable, Comparable) */ @Override public Number getValue(int row, int column) { return this.data.getValue(row, column); } /** * Returns the key for the specified row. * * @param row the row index (zero-based). * * @return The row key. * * @see #getRowIndex(Comparable) * @see #getRowKeys() * @see #getColumnKey(int) */ @Override public Comparable getRowKey(int row) { return this.data.getRowKey(row); } /** * Returns the row index for a given key. * * @param key the row key (<code>null</code> not permitted). * * @return The row index. * * @see #getRowKey(int) */ @Override public int getRowIndex(Comparable key) { // defer null argument check return this.data.getRowIndex(key); } /** * Returns the row keys. * * @return The keys. * * @see #getRowKey(int) */ @Override public List<Comparable> getRowKeys() { return this.data.getRowKeys(); } /** * Returns a column key. * * @param column the column index (zero-based). * * @return The column key. * * @see #getColumnIndex(Comparable) */ @Override public Comparable getColumnKey(int column) { return this.data.getColumnKey(column); } /** * Returns the column index for a given key. * * @param key the column key (<code>null</code> not permitted). * * @return The column index. * * @see #getColumnKey(int) */ @Override public int getColumnIndex(Comparable key) { // defer null argument check return this.data.getColumnIndex(key); } /** * Returns the column keys. * * @return The keys. * * @see #getColumnKey(int) */ @Override public List<Comparable> getColumnKeys() { return this.data.getColumnKeys(); } /** * Returns the value for a pair of keys. * * @param rowKey the row key (<code>null</code> not permitted). * @param columnKey the column key (<code>null</code> not permitted). * * @return The value (possibly <code>null</code>). * * @throws UnknownKeyException if either key is not defined in the dataset. * * @see #addValue(Number, Comparable, Comparable) */ @Override public Number getValue(Comparable rowKey, Comparable columnKey) { return this.data.getValue(rowKey, columnKey); } /** * Adds a value to the table. Performs the same function as setValue(). * * @param value the value. * @param rowKey the row key. * @param columnKey the column key. * * @see #getValue(Comparable, Comparable) * @see #removeValue(Comparable, Comparable) */ public void addValue(Number value, Comparable rowKey, Comparable columnKey) { this.data.addValue(value, rowKey, columnKey); fireDatasetChanged(); } /** * Adds a value to the table. * * @param value the value. * @param rowKey the row key. * @param columnKey the column key. * * @see #getValue(Comparable, Comparable) */ public void addValue(double value, Comparable rowKey, Comparable columnKey) { addValue(new Double(value), rowKey, columnKey); } /** * Adds or updates a value in the table and sends a * {@link DatasetChangeEvent} to all registered listeners. * * @param value the value (<code>null</code> permitted). * @param rowKey the row key (<code>null</code> not permitted). * @param columnKey the column key (<code>null</code> not permitted). * * @see #getValue(Comparable, Comparable) */ public void setValue(Number value, Comparable rowKey, Comparable columnKey) { this.data.setValue(value, rowKey, columnKey); fireDatasetChanged(); } /** * Adds or updates a value in the table and sends a * {@link DatasetChangeEvent} to all registered listeners. * * @param value the value. * @param rowKey the row key (<code>null</code> not permitted). * @param columnKey the column key (<code>null</code> not permitted). * * @see #getValue(Comparable, Comparable) */ public void setValue(double value, Comparable rowKey, Comparable columnKey) { setValue(new Double(value), rowKey, columnKey); } /** * Adds the specified value to an existing value in the dataset (if the * existing value is <code>null</code>, it is treated as if it were 0.0). * * @param value the value. * @param rowKey the row key (<code>null</code> not permitted). * @param columnKey the column key (<code>null</code> not permitted). * * @throws UnknownKeyException if either key is not defined in the dataset. */ public void incrementValue(double value, Comparable rowKey, Comparable columnKey) { double existing = 0.0; Number n = getValue(rowKey, columnKey); if (n != null) { existing = n.doubleValue(); } setValue(existing + value, rowKey, columnKey); } /** * Removes a value from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. * * @param rowKey the row key. * @param columnKey the column key. * * @see #addValue(Number, Comparable, Comparable) */ public void removeValue(Comparable rowKey, Comparable columnKey) { this.data.removeValue(rowKey, columnKey); fireDatasetChanged(); } /** * Removes a row from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. * * @param rowIndex the row index. * * @see #removeColumn(int) */ public void removeRow(int rowIndex) { this.data.removeRow(rowIndex); fireDatasetChanged(); } /** * Removes a row from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. * * @param rowKey the row key. * * @see #removeColumn(Comparable) */ public void removeRow(Comparable rowKey) { this.data.removeRow(rowKey); fireDatasetChanged(); } /** * Removes a column from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. * * @param columnIndex the column index. * * @see #removeRow(int) */ public void removeColumn(int columnIndex) { this.data.removeColumn(columnIndex); fireDatasetChanged(); } /** * Removes a column from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. * * @param columnKey the column key (<code>null</code> not permitted). * * @see #removeRow(Comparable) * * @throws UnknownKeyException if <code>columnKey</code> is not defined * in the dataset. */ public void removeColumn(Comparable columnKey) { this.data.removeColumn(columnKey); fireDatasetChanged(); } /** * Clears all data from the dataset and sends a {@link DatasetChangeEvent} * to all registered listeners. */ public void clear() { this.data.clear(); fireDatasetChanged(); } /** * Tests this dataset for equality with an arbitrary object. * * @param obj the object (<code>null</code> permitted). * * @return A boolean. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof CategoryDataset)) { return false; } CategoryDataset that = (CategoryDataset) obj; if (!getRowKeys().equals(that.getRowKeys())) { return false; } if (!getColumnKeys().equals(that.getColumnKeys())) { return false; } int rowCount = getRowCount(); int colCount = getColumnCount(); for (int r = 0; r < rowCount; r++) { for (int c = 0; c < colCount; c++) { Number v1 = getValue(r, c); Number v2 = that.getValue(r, c); if (v1 == null) { if (v2 != null) { return false; } } else if (!v1.equals(v2)) { return false; } } } return true; } /** * Returns a hash code for the dataset. * * @return A hash code. */ @Override public int hashCode() { return this.data.hashCode(); } /** * Returns a clone of the dataset. * * @return A clone. * * @throws CloneNotSupportedException if there is a problem cloning the * dataset. */ @Override public Object clone() throws CloneNotSupportedException { DefaultCategoryDataset clone = (DefaultCategoryDataset) super.clone(); clone.data = (DefaultKeyedValues2D) this.data.clone(); return clone; } }