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
26package 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 */
42public 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 =
85                (GraphicsPrimitive) clazz.getDeclaredConstructor().newInstance();
86            if (!satisfiesSameAs(p)) {
87                throw new RuntimeException("Primitive " + p
88                                           + " incompatible with proxy for "
89                                           + name);
90            }
91            return p;
92        } catch (ReflectiveOperationException ex) {
93            throw new RuntimeException(ex.toString());
94        }
95        // A RuntimeException should never happen in a deployed JDK, because
96        // the regression test GraphicsPrimitiveProxyTest will catch any
97        // of these errors.
98    }
99
100    private static String getPackageName(String className) {
101        int lastDotIdx = className.lastIndexOf('.');
102        if (lastDotIdx < 0) {
103            return className;
104        }
105        return className.substring(0, lastDotIdx);
106    }
107
108    public GraphicsPrimitive traceWrap() {
109        return instantiate().traceWrap();
110    }
111}
112