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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
package sun.java2d.loops;
/**
* GraphicsPrimitiveProxy
*
* Acts as a proxy for instances of GraphicsPrimitive, enabling lazy
* classloading of these primitives. This leads to a substantial
* savings in start-up time and footprint. In the typical case,
* it has been found that a small number of GraphicsPrimitive instance
* actually end up getting instantiated.
* <p>
* Note that the makePrimitive method should never be invoked on
* a GraphicsPrimitiveProxy object since they are instantiated as
* soon as they are found in the primitive list and never returned
* to the caller.
*/
public class GraphicsPrimitiveProxy extends GraphicsPrimitive {
private Class owner;
private String relativeClassName;
/**
* Create a GraphicsPrimitiveProxy for a primitive with a no-argument
* constructor.
*
* @param owner The owner class for this primitive. The primitive
* must be in the same package as this owner.
* @param relativeClassName The name of the class this is a proxy for.
* This should not include the package.
*/
public GraphicsPrimitiveProxy(Class owner, String relativeClassName,
String methodSignature,
int primID,
SurfaceType srctype,
CompositeType comptype,
SurfaceType dsttype)
{
super(methodSignature, primID, srctype, comptype, dsttype);
this.owner = owner;
this.relativeClassName = relativeClassName;
}
public GraphicsPrimitive makePrimitive(SurfaceType srctype,
CompositeType comptype,
SurfaceType dsttype) {
// This should never happen.
throw new InternalError("makePrimitive called on a Proxy!");
}
//
// Come up with the real instance. Called from
// GraphicsPrimitiveMgr.locate()
//
GraphicsPrimitive instantiate() {
String name = getPackageName(owner.getName()) + "."
+ relativeClassName;
try {
Class clazz = Class.forName(name);
GraphicsPrimitive p = (GraphicsPrimitive) clazz.newInstance();
if (!satisfiesSameAs(p)) {
throw new RuntimeException("Primitive " + p
+ " incompatible with proxy for "
+ name);
}
return p;
} catch (ClassNotFoundException ex) {
throw new RuntimeException(ex.toString());
} catch (InstantiationException ex) {
throw new RuntimeException(ex.toString());
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex.toString());
}
// A RuntimeException should never happen in a deployed JDK, because
// the regression test GraphicsPrimitiveProxyTest will catch any
// of these errors.
}
private static String getPackageName(String className) {
int lastDotIdx = className.lastIndexOf('.');
if (lastDotIdx < 0) {
return className;
}
return className.substring(0, lastDotIdx);
}
public GraphicsPrimitive traceWrap() {
return instantiate().traceWrap();
}
}