1 /*
2 * Copyright (c) 2002-2007 by OpenSymphony
3 * All rights reserved.
4 */
5 package com.opensymphony.xwork2.interceptor;
6
7 import com.opensymphony.xwork2.ActionInvocation;
8 import com.opensymphony.xwork2.Unchainable;
9 import com.opensymphony.xwork2.inject.Inject;
10 import com.opensymphony.xwork2.util.CompoundRoot;
11 import com.opensymphony.xwork2.util.ValueStack;
12 import com.opensymphony.xwork2.util.logging.Logger;
13 import com.opensymphony.xwork2.util.logging.LoggerFactory;
14 import com.opensymphony.xwork2.util.reflection.ReflectionProvider;
15
16 import java.util;
17
18
19 /**
20 * <!-- START SNIPPET: description -->
21 *
22 * An interceptor that copies all the properties of every object in the value stack to the currently executing object,
23 * except for any object that implements {@link Unchainable}. A collection of optional <i>includes</i> and
24 * <i>excludes</i> may be provided to control how and which parameters are copied. Only includes or excludes may be
25 * specified. Specifying both results in undefined behavior. See the javadocs for {@link ReflectionProvider#copy(Object, Object,
26 * java.util.Map, java.util.Collection, java.util.Collection)} for more information.
27 *
28 * <p/>
29 * <b>Note:</b> It is important to remember that this interceptor does nothing if there are no objects already on the stack.
30 * <br/>This means two things:
31 * <br/><b>One</b>, you can safely apply it to all your actions without any worry of adverse affects.
32 * <br/><b/>Two</b>, it is up to you to ensure an object exists in the stack prior to invoking this action. The most typical way this is done
33 * is through the use of the <b>chain</b> result type, which combines with this interceptor to make up the action
34 * chaining feature.
35 *
36 * <!-- END SNIPPET: description -->
37 *
38 * <p/> <u>Interceptor parameters:</u>
39 *
40 * <!-- START SNIPPET: parameters -->
41 *
42 * <ul>
43 *
44 * <li>excludes (optional) - the list of parameter names to exclude from copying (all others will be included).</li>
45 *
46 * <li>includes (optional) - the list of parameter names to include when copying (all others will be excluded).</li>
47 *
48 * </ul>
49 *
50 * <!-- END SNIPPET: parameters -->
51 *
52 * <p/> <u>Extending the interceptor:</u>
53 *
54 * <p/>
55 *
56 * <!-- START SNIPPET: extending -->
57 *
58 * There are no known extension points to this interceptor.
59 *
60 * <!-- END SNIPPET: extending -->
61 *
62 * <p/> <u>Example code:</u>
63 *
64 * <pre>
65 * <!-- START SNIPPET: example -->
66 *
67 * <action name="someAction" class="com.examples.SomeAction">
68 * <interceptor-ref name="basicStack"/>
69 * <result name="success" type="chain">otherAction</result>
70 * </action>
71 *
72 * <action name="otherAction" class="com.examples.OtherAction">
73 * <interceptor-ref name="chain"/>
74 * <interceptor-ref name="basicStack"/>
75 * <result name="success">good_result.ftl</result>
76 * </action>
77 *
78 * <!-- END SNIPPET: example -->
79 * </pre>
80 *
81 * @see com.opensymphony.xwork2.ActionChainResult
82 * @author mrdon
83 * @author tm_jee ( tm_jee(at)yahoo.co.uk )
84 */
85 public class ChainingInterceptor extends AbstractInterceptor {
86
87 private static final Logger LOG = LoggerFactory.getLogger(ChainingInterceptor.class);
88
89 protected Collection<String> excludes;
90 protected Collection<String> includes;
91
92 protected ReflectionProvider reflectionProvider;
93
94 @Inject
95 public void setReflectionProvider(ReflectionProvider prov) {
96 this.reflectionProvider = prov;
97 }
98
99 @Override
100 public String intercept(ActionInvocation invocation) throws Exception {
101 ValueStack stack = invocation.getStack();
102 CompoundRoot root = stack.getRoot();
103
104 if (root.size() > 1) {
105 List<CompoundRoot> list = new ArrayList<CompoundRoot>(root);
106 list.remove(0);
107 Collections.reverse(list);
108
109 Map<String, Object> ctxMap = invocation.getInvocationContext().getContextMap();
110 Iterator<CompoundRoot> iterator = list.iterator();
111 int index = 1; // starts with 1, 0 has been removed
112 while (iterator.hasNext()) {
113 index = index + 1;
114 Object o = iterator.next();
115 if (o != null) {
116 if (!(o instanceof Unchainable)) {
117 reflectionProvider.copy(o, invocation.getAction(), ctxMap, excludes, includes);
118 }
119 }
120 else {
121 LOG.warn("compound root element at index "+index+" is null");
122 }
123 }
124 }
125
126 return invocation.invoke();
127 }
128
129 /**
130 * Gets list of parameter names to exclude
131 *
132 * @return the exclude list
133 */
134 public Collection<String> getExcludes() {
135 return excludes;
136 }
137
138 /**
139 * Sets the list of parameter names to exclude from copying (all others will be included).
140 *
141 * @param excludes the excludes list
142 */
143 public void setExcludes(Collection<String> excludes) {
144 this.excludes = excludes;
145 }
146
147 /**
148 * Gets list of parameter names to include
149 *
150 * @return the include list
151 */
152 public Collection<String> getIncludes() {
153 return includes;
154 }
155
156 /**
157 * Sets the list of parameter names to include when copying (all others will be excluded).
158 *
159 * @param includes the includes list
160 */
161 public void setIncludes(Collection<String> includes) {
162 this.includes = includes;
163 }
164
165 }
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