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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ReflectedObjectStore.java | 100% | 94.4% | 100% | 96.2% |
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1 | /* | |
2 | * Copyright (c) 1998, 2005 Gargoyle Software Inc. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions are met: | |
6 | * | |
7 | * 1. Redistributions of source code must retain the above copyright notice, | |
8 | * this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
10 | * this list of conditions and the following disclaimer in the documentation | |
11 | * and/or other materials provided with the distribution. | |
12 | * 3. The end-user documentation included with the redistribution, if any, must | |
13 | * include the following acknowledgment: | |
14 | * | |
15 | * "This product includes software developed by Gargoyle Software Inc. | |
16 | * (http://www.GargoyleSoftware.com/)." | |
17 | * | |
18 | * Alternately, this acknowledgment may appear in the software itself, if | |
19 | * and wherever such third-party acknowledgments normally appear. | |
20 | * 4. The name "Gargoyle Software" must not be used to endorse or promote | |
21 | * products derived from this software without prior written permission. | |
22 | * For written permission, please contact info@GargoyleSoftware.com. | |
23 | * 5. Products derived from this software may not be called "GSBase", nor may | |
24 | * "GSBase" appear in their name, without prior written permission of | |
25 | * Gargoyle Software Inc. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, | |
28 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
29 | * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GARGOYLE | |
30 | * SOFTWARE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
31 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
32 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, | |
33 | * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
34 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
35 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
36 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
37 | */ | |
38 | package com.gargoylesoftware.base.objectstore; | |
39 | ||
40 | import com.gargoylesoftware.base.util.DetailedIllegalArgumentException; | |
41 | import java.lang.reflect.InvocationTargetException; | |
42 | import java.lang.reflect.Method; | |
43 | import java.util.HashMap; | |
44 | import java.util.Map; | |
45 | ||
46 | /** | |
47 | * An object store that allows configuration by reflection. Commands are mapped to | |
48 | * method names such that when a specified command is received, it will be dispatched | |
49 | * via reflection to the specified method. | |
50 | * | |
51 | * @version $Revision: 1.4 $ | |
52 | * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a> | |
53 | */ | |
54 | public abstract class ReflectedObjectStore extends ObjectStore { | |
55 | ||
56 | private final Map commandMap_ = new HashMap( 89 ); | |
57 | ||
58 | ||
59 | /** | |
60 | * Create an instance | |
61 | */ | |
62 | 5 | public ReflectedObjectStore() { |
63 | } | |
64 | ||
65 | ||
66 | /** | |
67 | * Execute the specified command | |
68 | * | |
69 | * @param command The command to execute | |
70 | * @return An object | |
71 | * @exception Throwable If an error occurs | |
72 | */ | |
73 | 3 | protected final Object executeImpl( final ObjectStoreCommand command ) |
74 | throws Throwable { | |
75 | ||
76 | 3 | final Method method = (Method)commandMap_.get( command.getClass() ); |
77 | 3 | if( method == null ) { |
78 | 2 | throw new ObjectStoreCommandNotSupportedException( command ); |
79 | } | |
80 | ||
81 | 1 | try { |
82 | 1 | return method.invoke( this, new Object[]{command} ); |
83 | } | |
84 | catch( final InvocationTargetException e ) { | |
85 | 0 | throw e.getTargetException(); |
86 | } | |
87 | } | |
88 | ||
89 | ||
90 | /** | |
91 | * Register a command and the method that will be invoked when that command is | |
92 | * passed into execute() | |
93 | * | |
94 | * @param commandClass The class of the command | |
95 | * @param methodName The name of the method that will be executed | |
96 | */ | |
97 | 4 | public void registerCommand( final Class commandClass, final String methodName ) { |
98 | 4 | assertNotNull( "commandClass", commandClass ); |
99 | 4 | assertNotNull( "methodName", methodName ); |
100 | ||
101 | 4 | if( ObjectStoreCommand.class.isAssignableFrom( commandClass ) == false ) { |
102 | 1 | throw new DetailedIllegalArgumentException( |
103 | "commandClass", commandClass, "Must be an instance of ObjectStoreCommand" ); | |
104 | } | |
105 | ||
106 | 3 | final Method method; |
107 | 3 | try { |
108 | 3 | method = getClass().getDeclaredMethod( methodName, new Class[]{commandClass} ); |
109 | } | |
110 | catch( final NoSuchMethodException e ) { | |
111 | 1 | throw new DetailedIllegalArgumentException( |
112 | "methodName", methodName, "No method found on class " + commandClass.getName() ); | |
113 | } | |
114 | ||
115 | 2 | attemptToSuppressAccessControl( method ); |
116 | ||
117 | 2 | commandMap_.put( commandClass, method ); |
118 | } | |
119 | ||
120 | ||
121 | 2 | private void attemptToSuppressAccessControl( final Method method ) { |
122 | 2 | try { |
123 | 2 | method.setAccessible( true ); |
124 | } | |
125 | catch( final SecurityException e ) { | |
126 | // Nothing we can do if this fails | |
127 | } | |
128 | } | |
129 | } | |
130 |
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