plantuml/src/jcckit/graphic/GraphicalComposite.java

107 lines
3.5 KiB
Java

/*
* Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
*
* 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 program 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
* (http://www.gnu.org/copyleft/lesser.html).
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcckit.graphic;
import java.util.Vector;
/**
* Container for {@link GraphicalElement GraphicalElements}.
*
* @author Franz-Josef Elmer
*/
public class GraphicalComposite implements GraphicalElement {
private final Vector _elements = new Vector();
private final ClippingShape _clippingShape;
/**
* Creates an instance with the specified clipping shape.
* @param clippingShape Clipping shape or <tt>null</tt> if no clipping.
*/
public GraphicalComposite(ClippingShape clippingShape) {
_clippingShape = clippingShape;
}
/**
* Returns the clipping shape.
* @return <tt>null</tt> if no clipping should be applied.
*/
public ClippingShape getClippingShape() {
return _clippingShape;
}
/**
* Adds the specified element at the end of the list of elements.
* @param element Element to be added. <tt>null</tt> is not allowed.
* @throws NullPointerException if <tt>element == null</tt>
*/
public void addElement(GraphicalElement element) {
if (element == null) {
throwNullPointerException();
} else {
_elements.addElement(element);
}
}
/** Remove all elements. */
public void removeAllElements() {
_elements.removeAllElements();
}
/**
* Replaces the specified element at the specified index of
* the list of elements.
* @param element New element. <tt>null</tt> is not allowed.
* @throws NullPointerException if <tt>element == null</tt>
*/
public void replaceElementAt(int index, GraphicalElement element) {
if (element == null) {
throwNullPointerException();
} else {
_elements.setElementAt(element, index);
}
}
private void throwNullPointerException() {
throw new NullPointerException(
"A null as an GraphicalElement is not allowed");
}
/**
* Renders all {@link GraphicalElement GraphicalElements} in the sequence
* they have been added.
* @param renderer Renderer which implements all renderer interfaces
* necessary to render the child elements.
* @throws IllegalArgumentException if <tt>renderer</tt> is not
* an instance of <tt>GraphicalCompositeRenderer</tt>.
*/
public void renderWith(Renderer renderer) {
if (renderer instanceof GraphicalCompositeRenderer) {
GraphicalCompositeRenderer r = (GraphicalCompositeRenderer) renderer;
r.startRendering(this);
for (int i = 0, n = _elements.size(); i < n; i++) {
((GraphicalElement) _elements.elementAt(i)).renderWith(r);
}
r.finishRendering(this);
} else {
throw new IllegalArgumentException(renderer
+ " does not implements GraphicalCompositeRenderer.");
}
}
}