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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.java2d.loops; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * GraphicsPrimitiveProxy | ||
| 30 | * | ||
| 31 | * Acts as a proxy for instances of GraphicsPrimitive, enabling lazy | ||
| 32 | * classloading of these primitives. This leads to a substantial | ||
| 33 | * savings in start-up time and footprint. In the typical case, | ||
| 34 | * it has been found that a small number of GraphicsPrimitive instance | ||
| 35 | * actually end up getting instantiated. | ||
| 36 | * <p> | ||
| 37 | * Note that the makePrimitive method should never be invoked on | ||
| 38 | * a GraphicsPrimitiveProxy object since they are instantiated as | ||
| 39 | * soon as they are found in the primitive list and never returned | ||
| 40 | * to the caller. | ||
| 41 | */ | ||
| 42 | public class GraphicsPrimitiveProxy extends GraphicsPrimitive { | ||
| 43 | |||
| 44 | private Class owner; | ||
| 45 | private String relativeClassName; | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Create a GraphicsPrimitiveProxy for a primitive with a no-argument | ||
| 49 | * constructor. | ||
| 50 | * | ||
| 51 | * @param owner The owner class for this primitive. The primitive | ||
| 52 | * must be in the same package as this owner. | ||
| 53 | * @param relativeClassName The name of the class this is a proxy for. | ||
| 54 | * This should not include the package. | ||
| 55 | */ | ||
| 56 | public GraphicsPrimitiveProxy(Class owner, String relativeClassName, | ||
| 57 | String methodSignature, | ||
| 58 | int primID, | ||
| 59 | SurfaceType srctype, | ||
| 60 | CompositeType comptype, | ||
| 61 | SurfaceType dsttype) | ||
| 62 | { | ||
| 63 | super(methodSignature, primID, srctype, comptype, dsttype); | ||
| 64 | this.owner = owner; | ||
| 65 | this.relativeClassName = relativeClassName; | ||
| 66 | } | ||
| 67 | |||
| 68 | public GraphicsPrimitive makePrimitive(SurfaceType srctype, | ||
| 69 | CompositeType comptype, | ||
| 70 | SurfaceType dsttype) { | ||
| 71 | // This should never happen. | ||
| 72 | throw new InternalError("makePrimitive called on a Proxy!"); | ||
| 73 | } | ||
| 74 | |||
| 75 | // | ||
| 76 | // Come up with the real instance. Called from | ||
| 77 | // GraphicsPrimitiveMgr.locate() | ||
| 78 | // | ||
| 79 | GraphicsPrimitive instantiate() { | ||
| 80 | String name = getPackageName(owner.getName()) + "." | ||
| 81 | + relativeClassName; | ||
| 82 | try { | ||
| 83 | Class clazz = Class.forName(name); | ||
| 84 | GraphicsPrimitive p = (GraphicsPrimitive) clazz.newInstance(); | ||
| 85 | if (!satisfiesSameAs(p)) { | ||
| 86 | throw new RuntimeException("Primitive " + p | ||
| 87 | + " incompatible with proxy for " | ||
| 88 | + name); | ||
| 89 | } | ||
| 90 | return p; | ||
| 91 | } catch (ClassNotFoundException ex) { | ||
| 92 | throw new RuntimeException(ex.toString()); | ||
| 93 | } catch (InstantiationException ex) { | ||
| 94 | throw new RuntimeException(ex.toString()); | ||
| 95 | } catch (IllegalAccessException ex) { | ||
| 96 | throw new RuntimeException(ex.toString()); | ||
| 97 | } | ||
| 98 | // A RuntimeException should never happen in a deployed JDK, because | ||
| 99 | // the regression test GraphicsPrimitiveProxyTest will catch any | ||
| 100 | // of these errors. | ||
| 101 | } | ||
| 102 | |||
| 103 | private static String getPackageName(String className) { | ||
| 104 | int lastDotIdx = className.lastIndexOf('.'); | ||
| 105 | if (lastDotIdx < 0) { | ||
| 106 | return className; | ||
| 107 | } | ||
| 108 | return className.substring(0, lastDotIdx); | ||
| 109 | } | ||
| 110 | |||
| 111 | public GraphicsPrimitive traceWrap() { | ||
| 112 | return instantiate().traceWrap(); | ||
| 113 | } | ||
| 114 | } | ||