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jfreechart example source code file (BlockContainer.java)

This example jfreechart source code file (BlockContainer.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

arrangement, awt, block, blockcontainer, blockcontainer, blockresult, entityblockparams, entityblockparams, entityblockresult, geometry, io, list, object, object, rectangle2d, rectangle2d, standardentitycollection, util

The jfreechart BlockContainer.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.]
 *
 * -------------------
 * BlockContainer.java
 * -------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 02-Feb-2005 : Added isEmpty() method (DG);
 * 04-Feb-2005 : Added equals(), clone() and implemented Serializable (DG);
 * 08-Feb-2005 : Updated for changes in RectangleConstraint (DG);
 * 20-Apr-2005 : Added new draw() method (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 20-Jul-2006 : Perform translation directly on drawing area, not via
 *               Graphics2D (DG);
 *
 */

package org.jfree.chart.block;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.ui.Size2D;
import org.jfree.util.PublicCloneable;

/**
 * A container for a collection of {@link Block} objects.  The container uses
 * an {@link Arrangement} object to handle the position of each block.
 */
public class BlockContainer extends AbstractBlock
        implements Block, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 8199508075695195293L;

    /** The blocks within the container. */
    private List blocks;

    /** The object responsible for laying out the blocks. */
    private Arrangement arrangement;

    /**
     * Creates a new instance with default settings.
     */
    public BlockContainer() {
        this(new BorderArrangement());
    }

    /**
     * Creates a new instance with the specified arrangement.
     *
     * @param arrangement  the arrangement manager (<code>null not
     *                     permitted).
     */
    public BlockContainer(Arrangement arrangement) {
        if (arrangement == null) {
            throw new IllegalArgumentException("Null 'arrangement' argument.");
        }
        this.arrangement = arrangement;
        this.blocks = new ArrayList();
    }

    /**
     * Returns the arrangement (layout) manager for the container.
     *
     * @return The arrangement manager (never <code>null).
     */
    public Arrangement getArrangement() {
        return this.arrangement;
    }

    /**
     * Sets the arrangement (layout) manager.
     *
     * @param arrangement  the arrangement (<code>null not permitted).
     */
    public void setArrangement(Arrangement arrangement) {
        if (arrangement == null) {
            throw new IllegalArgumentException("Null 'arrangement' argument.");
        }
        this.arrangement = arrangement;
    }

    /**
     * Returns <code>true if there are no blocks in the container, and
     * <code>false otherwise.
     *
     * @return A boolean.
     */
    public boolean isEmpty() {
        return this.blocks.isEmpty();
    }

    /**
     * Returns an unmodifiable list of the {@link Block} objects managed by
     * this arrangement.
     *
     * @return A list of blocks.
     */
    public List getBlocks() {
        return Collections.unmodifiableList(this.blocks);
    }

    /**
     * Adds a block to the container.
     *
     * @param block  the block (<code>null permitted).
     */
    public void add(Block block) {
        add(block, null);
    }

    /**
     * Adds a block to the container.
     *
     * @param block  the block (<code>null permitted).
     * @param key  the key (<code>null permitted).
     */
    public void add(Block block, Object key) {
        this.blocks.add(block);
        this.arrangement.add(block, key);
    }

    /**
     * Clears all the blocks from the container.
     */
    public void clear() {
        this.blocks.clear();
        this.arrangement.clear();
    }

    /**
     * Arranges the contents of the block, within the given constraints, and
     * returns the block size.
     *
     * @param g2  the graphics device.
     * @param constraint  the constraint (<code>null not permitted).
     *
     * @return The block size (in Java2D units, never <code>null).
     */
    public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
        return this.arrangement.arrange(this, g2, constraint);
    }

    /**
     * Draws the container and all the blocks within it.
     *
     * @param g2  the graphics device.
     * @param area  the area.
     */
    public void draw(Graphics2D g2, Rectangle2D area) {
        draw(g2, area, null);
    }

    /**
     * Draws the block within the specified area.
     *
     * @param g2  the graphics device.
     * @param area  the area.
     * @param params  passed on to blocks within the container
     *                (<code>null permitted).
     *
     * @return An instance of {@link EntityBlockResult}, or <code>null.
     */
    public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
        // check if we need to collect chart entities from the container
        EntityBlockParams ebp = null;
        StandardEntityCollection sec = null;
        if (params instanceof EntityBlockParams) {
            ebp = (EntityBlockParams) params;
            if (ebp.getGenerateEntities()) {
                sec = new StandardEntityCollection();
            }
        }
        Rectangle2D contentArea = (Rectangle2D) area.clone();
        contentArea = trimMargin(contentArea);
        drawBorder(g2, contentArea);
        contentArea = trimBorder(contentArea);
        contentArea = trimPadding(contentArea);
        Iterator iterator = this.blocks.iterator();
        while (iterator.hasNext()) {
            Block block = (Block) iterator.next();
            Rectangle2D bounds = block.getBounds();
            Rectangle2D drawArea = new Rectangle2D.Double(bounds.getX()
                    + area.getX(), bounds.getY() + area.getY(),
                    bounds.getWidth(), bounds.getHeight());
            Object r = block.draw(g2, drawArea, params);
            if (sec != null) {
                if (r instanceof EntityBlockResult) {
                    EntityBlockResult ebr = (EntityBlockResult) r;
                    EntityCollection ec = ebr.getEntityCollection();
                    sec.addAll(ec);
                }
            }
        }
        BlockResult result = null;
        if (sec != null) {
            result = new BlockResult();
            result.setEntityCollection(sec);
        }
        return result;
    }

    /**
     * Tests this container 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 BlockContainer)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        BlockContainer that = (BlockContainer) obj;
        if (!this.arrangement.equals(that.arrangement)) {
            return false;
        }
        if (!this.blocks.equals(that.blocks)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of the container.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        BlockContainer clone = (BlockContainer) super.clone();
        // TODO : complete this
        return clone;
    }

}

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