Source Code Cross Referenced for SingletonTargetSource.java in  » J2EE » spring-framework-2.0.6 » org » springframework » aop » target » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.aop.target 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2007 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.aop.target;
18:
19:        import java.io.Serializable;
20:
21:        import org.springframework.aop.TargetSource;
22:        import org.springframework.util.Assert;
23:        import org.springframework.util.ObjectUtils;
24:
25:        /**
26:         * Implementation of the {@link org.springframework.aop.TargetSource} interface
27:         * that holds a given object. This is the default implementation of the TargetSource
28:         * interface, as used by the Spring AOP framework. There is usually no need to
29:         * create objects of this class in application code.
30:         *
31:         * <p>This class is serializable. However, the actual serializability of a
32:         * SingletonTargetSource will depend on whether the target is serializable.
33:         *
34:         * @author Rod Johnson
35:         * @author Juergen Hoeller
36:         * @see org.springframework.aop.framework.AdvisedSupport#setTarget(Object)
37:         */
38:        public class SingletonTargetSource implements  TargetSource,
39:                Serializable {
40:
41:            /** use serialVersionUID from Spring 1.2 for interoperability */
42:            private static final long serialVersionUID = 9031246629662423738L;
43:
44:            /** Target cached and invoked using reflection */
45:            private final Object target;
46:
47:            /**
48:             * Create a new SingletonTargetSource for the given target.
49:             * @param target the target object
50:             */
51:            public SingletonTargetSource(Object target) {
52:                Assert.notNull(target, "Target object must not be null");
53:                this .target = target;
54:            }
55:
56:            public Class getTargetClass() {
57:                return this .target.getClass();
58:            }
59:
60:            public Object getTarget() {
61:                return this .target;
62:            }
63:
64:            public void releaseTarget(Object target) {
65:                // nothing to do
66:            }
67:
68:            public boolean isStatic() {
69:                return true;
70:            }
71:
72:            /**
73:             * Two invoker interceptors are equal if they have the same target or if the
74:             * targets or the targets are equal.
75:             */
76:            public boolean equals(Object other) {
77:                if (this  == other) {
78:                    return true;
79:                }
80:                if (!(other instanceof  SingletonTargetSource)) {
81:                    return false;
82:                }
83:                SingletonTargetSource otherTargetSource = (SingletonTargetSource) other;
84:                return this .target.equals(otherTargetSource.target);
85:            }
86:
87:            /**
88:             * SingletonTargetSource uses the hash code of the target object.
89:             */
90:            public int hashCode() {
91:                return this .target.hashCode();
92:            }
93:
94:            public String toString() {
95:                return "SingletonTargetSource for target object ["
96:                        + ObjectUtils.identityToString(this .target) + "]";
97:            }
98:
99:        }
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