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jfreechart example source code file (KeyedObjects2D.java)

This example jfreechart source code file (KeyedObjects2D.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

column, comparable, comparable, illegalargumentexception, io, keyedobjects, keyedobjects, keyedobjects2d, keyedobjects2d, list, null, object, object, row, unknownkeyexception, util

The jfreechart KeyedObjects2D.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.]
 *
 * ------------------
 * KeyedObject2D.java
 * ------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 05-Feb-2003 : Version 1 (DG);
 * 01-Mar-2004 : Added equals() and clone() methods and implemented
 *               Serializable (DG);
 * 03-Oct-2007 : Updated getObject() to handle modified behaviour in
 *               KeyedObjects class, added clear() method (DG);
 *
 */

package org.jfree.data;

import java.io.Serializable;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * A data structure that stores zero, one or many objects, where each object is
 * associated with two keys (a 'row' key and a 'column' key).
 */
public class KeyedObjects2D implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -1015873563138522374L;

    /** The row keys. */
    private List rowKeys;

    /** The column keys. */
    private List columnKeys;

    /** The row data. */
    private List rows;

    /**
     * Creates a new instance (initially empty).
     */
    public KeyedObjects2D() {
        this.rowKeys = new java.util.ArrayList();
        this.columnKeys = new java.util.ArrayList();
        this.rows = new java.util.ArrayList();
    }

    /**
     * Returns the row count.
     *
     * @return The row count.
     *
     * @see #getColumnCount()
     */
    public int getRowCount() {
        return this.rowKeys.size();
    }

    /**
     * Returns the column count.
     *
     * @return The column count.
     *
     * @see #getRowCount()
     */
    public int getColumnCount() {
        return this.columnKeys.size();
    }

    /**
     * Returns the object for a given row and column.
     *
     * @param row  the row index (in the range 0 to getRowCount() - 1).
     * @param column  the column index (in the range 0 to getColumnCount() - 1).
     *
     * @return The object (possibly <code>null).
     *
     * @see #getObject(Comparable, Comparable)
     */
    public Object getObject(int row, int column) {
        Object result = null;
        KeyedObjects rowData = (KeyedObjects) this.rows.get(row);
        if (rowData != null) {
            Comparable columnKey = (Comparable) this.columnKeys.get(column);
            if (columnKey != null) {
                int index = rowData.getIndex(columnKey);
                if (index >= 0) {
                    result = rowData.getObject(columnKey);
                }
            }
        }
        return result;
    }

    /**
     * Returns the key for a given row.
     *
     * @param row  the row index (zero based).
     *
     * @return The row index.
     *
     * @see #getRowIndex(Comparable)
     */
    public Comparable getRowKey(int row) {
        return (Comparable) this.rowKeys.get(row);
    }

    /**
     * Returns the row index for a given key, or <code>-1 if the key
     * is not recognised.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @return The row index.
     *
     * @see #getRowKey(int)
     */
    public int getRowIndex(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        return this.rowKeys.indexOf(key);
    }

    /**
     * Returns the row keys.
     *
     * @return The row keys (never <code>null).
     *
     * @see #getRowKeys()
     */
    public List getRowKeys() {
        return Collections.unmodifiableList(this.rowKeys);
    }

    /**
     * Returns the key for a given column.
     *
     * @param column  the column.
     *
     * @return The key.
     *
     * @see #getColumnIndex(Comparable)
     */
    public Comparable getColumnKey(int column) {
        return (Comparable) this.columnKeys.get(column);
    }

    /**
     * Returns the column index for a given key, or <code>-1 if the key
     * is not recognised.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @return The column index.
     *
     * @see #getColumnKey(int)
     */
    public int getColumnIndex(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        return this.columnKeys.indexOf(key);
    }

    /**
     * Returns the column keys.
     *
     * @return The column keys (never <code>null).
     *
     * @see #getRowKeys()
     */
    public List getColumnKeys() {
        return Collections.unmodifiableList(this.columnKeys);
    }

    /**
     * Returns the object for the given row and column keys.
     *
     * @param rowKey  the row key (<code>null not permitted).
     * @param columnKey  the column key (<code>null not permitted).
     *
     * @return The object (possibly <code>null).
     *
     * @throws IllegalArgumentException if <code>rowKey or
     *         <code>columnKey is null.
     * @throws UnknownKeyException if <code>rowKey or
     *         <code>columnKey is not recognised.
     */
    public Object getObject(Comparable rowKey, Comparable columnKey) {
        if (rowKey == null) {
            throw new IllegalArgumentException("Null 'rowKey' argument.");
        }
        if (columnKey == null) {
            throw new IllegalArgumentException("Null 'columnKey' argument.");
        }
        int row = this.rowKeys.indexOf(rowKey);
        if (row < 0) {
            throw new UnknownKeyException("Row key (" + rowKey
                    + ") not recognised.");
        }
        int column = this.columnKeys.indexOf(columnKey);
        if (column < 0) {
            throw new UnknownKeyException("Column key (" + columnKey
                    + ") not recognised.");
        }
        KeyedObjects rowData = (KeyedObjects) this.rows.get(row);
        int index = rowData.getIndex(columnKey);
        if (index >= 0) {
            return rowData.getObject(index);
        }
        else {
            return null;
        }
    }

    /**
     * Adds an object to the table.  Performs the same function as setObject().
     *
     * @param object  the object.
     * @param rowKey  the row key (<code>null not permitted).
     * @param columnKey  the column key (<code>null not permitted).
     */
    public void addObject(Object object, Comparable rowKey,
            Comparable columnKey) {
        setObject(object, rowKey, columnKey);
    }

    /**
     * Adds or updates an object.
     *
     * @param object  the object.
     * @param rowKey  the row key (<code>null not permitted).
     * @param columnKey  the column key (<code>null not permitted).
     */
    public void setObject(Object object, Comparable rowKey,
            Comparable columnKey) {

        if (rowKey == null) {
            throw new IllegalArgumentException("Null 'rowKey' argument.");
        }
        if (columnKey == null) {
            throw new IllegalArgumentException("Null 'columnKey' argument.");
        }
        KeyedObjects row;
        int rowIndex = this.rowKeys.indexOf(rowKey);
        if (rowIndex >= 0) {
            row = (KeyedObjects) this.rows.get(rowIndex);
        }
        else {
            this.rowKeys.add(rowKey);
            row = new KeyedObjects();
            this.rows.add(row);
        }
        row.setObject(columnKey, object);
        int columnIndex = this.columnKeys.indexOf(columnKey);
        if (columnIndex < 0) {
            this.columnKeys.add(columnKey);
        }

    }

    /**
     * Removes an object from the table by setting it to <code>null.  If
     * all the objects in the specified row and/or column are now
     * <code>null, the row and/or column is removed from the table.
     *
     * @param rowKey  the row key (<code>null not permitted).
     * @param columnKey  the column key (<code>null not permitted).
     *
     * @see #addObject(Object, Comparable, Comparable)
     */
    public void removeObject(Comparable rowKey, Comparable columnKey) {
        int rowIndex = getRowIndex(rowKey);
        if (rowIndex < 0) {
            throw new UnknownKeyException("Row key (" + rowKey
                    + ") not recognised.");
        }
        int columnIndex = getColumnIndex(columnKey);
        if (columnIndex < 0) {
            throw new UnknownKeyException("Column key (" + columnKey
                    + ") not recognised.");
        }
        setObject(null, rowKey, columnKey);

        // 1. check whether the row is now empty.
        boolean allNull = true;
        KeyedObjects row = (KeyedObjects) this.rows.get(rowIndex);

        for (int item = 0, itemCount = row.getItemCount(); item < itemCount;
             item++) {
            if (row.getObject(item) != null) {
                allNull = false;
                break;
            }
        }

        if (allNull) {
            this.rowKeys.remove(rowIndex);
            this.rows.remove(rowIndex);
        }

        // 2. check whether the column is now empty.
        allNull = true;

        for (int item = 0, itemCount = this.rows.size(); item < itemCount;
             item++) {
            row = (KeyedObjects) this.rows.get(item);
            int colIndex = row.getIndex(columnKey);
            if (colIndex >= 0 && row.getObject(colIndex) != null) {
                allNull = false;
                break;
            }
        }

        if (allNull) {
            for (int item = 0, itemCount = this.rows.size(); item < itemCount;
                 item++) {
                row = (KeyedObjects) this.rows.get(item);
                int colIndex = row.getIndex(columnKey);
                if (colIndex >= 0) {
                    row.removeValue(colIndex);
                }
            }
            this.columnKeys.remove(columnKey);
        }
    }

    /**
     * Removes an entire row from the table.
     *
     * @param rowIndex  the row index.
     *
     * @see #removeColumn(int)
     */
    public void removeRow(int rowIndex) {
        this.rowKeys.remove(rowIndex);
        this.rows.remove(rowIndex);
    }

    /**
     * Removes an entire row from the table.
     *
     * @param rowKey  the row key (<code>null not permitted).
     *
     * @throws UnknownKeyException if <code>rowKey is not recognised.
     *
     * @see #removeColumn(Comparable)
     */
    public void removeRow(Comparable rowKey) {
        int index = getRowIndex(rowKey);
        if (index < 0) {
            throw new UnknownKeyException("Row key (" + rowKey
                    + ") not recognised.");
        }
        removeRow(index);
    }

    /**
     * Removes an entire column from the table.
     *
     * @param columnIndex  the column index.
     *
     * @see #removeRow(int)
     */
    public void removeColumn(int columnIndex) {
        Comparable columnKey = getColumnKey(columnIndex);
        removeColumn(columnKey);
    }

    /**
     * Removes an entire column from the table.
     *
     * @param columnKey  the column key (<code>null not permitted).
     *
     * @throws UnknownKeyException if <code>rowKey is not recognised.
     *
     * @see #removeRow(Comparable)
     */
    public void removeColumn(Comparable columnKey) {
        int index = getColumnIndex(columnKey);
        if (index < 0) {
            throw new UnknownKeyException("Column key (" + columnKey
                    + ") not recognised.");
        }
        Iterator iterator = this.rows.iterator();
        while (iterator.hasNext()) {
            KeyedObjects rowData = (KeyedObjects) iterator.next();
            int i = rowData.getIndex(columnKey);
            if (i >= 0) {
                rowData.removeValue(i);
            }
        }
        this.columnKeys.remove(columnKey);
    }

    /**
     * Clears all the data and associated keys.
     *
     * @since 1.0.7
     */
    public void clear() {
        this.rowKeys.clear();
        this.columnKeys.clear();
        this.rows.clear();
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object to test (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof KeyedObjects2D)) {
            return false;
        }

        KeyedObjects2D that = (KeyedObjects2D) obj;
        if (!getRowKeys().equals(that.getRowKeys())) {
            return false;
        }
        if (!getColumnKeys().equals(that.getColumnKeys())) {
            return false;
        }
        int rowCount = getRowCount();
        if (rowCount != that.getRowCount()) {
            return false;
        }
        int colCount = getColumnCount();
        if (colCount != that.getColumnCount()) {
            return false;
        }
        for (int r = 0; r < rowCount; r++) {
            for (int c = 0; c < colCount; c++) {
                Object v1 = getObject(r, c);
                Object v2 = that.getObject(r, c);
                if (v1 == null) {
                    if (v2 != null) {
                        return false;
                    }
                }
                else {
                    if (!v1.equals(v2)) {
                        return false;
                    }
                }
            }
        }
        return true;
    }

    /**
     * Returns a hashcode for this object.
     *
     * @return A hashcode.
     */
    public int hashCode() {
        int result;
        result = this.rowKeys.hashCode();
        result = 29 * result + this.columnKeys.hashCode();
        result = 29 * result + this.rows.hashCode();
        return result;
    }

    /**
     * Returns a clone.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  this class will not throw this
     *         exception, but subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {
        KeyedObjects2D clone = (KeyedObjects2D) super.clone();
        clone.columnKeys = new java.util.ArrayList(this.columnKeys);
        clone.rowKeys = new java.util.ArrayList(this.rowKeys);
        clone.rows = new java.util.ArrayList(this.rows.size());
        Iterator iterator = this.rows.iterator();
        while (iterator.hasNext()) {
            KeyedObjects row = (KeyedObjects) iterator.next();
            clone.rows.add(row.clone());
        }
        return clone;
    }

}

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