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1
16 package org.apache.cocoon.selection;
17
18 import java.util.Map  ;
19
20 import org.apache.avalon.framework.configuration.Configurable;
21 import org.apache.avalon.framework.configuration.Configuration;
22 import org.apache.avalon.framework.configuration.ConfigurationException;
23 import org.apache.avalon.framework.parameters.Parameters;
24 import org.apache.cocoon.environment.ObjectModelHelper;
25 import org.apache.cocoon.util.ClassUtils;
26 import org.apache.commons.lang.exception.ExceptionUtils;
27
28
57
58 public class ExceptionSelector extends AbstractSwitchSelector implements Configurable {
59
60
61 private Class [] clazz;
62
63
64 private String [] name;
65
66
67 private boolean[] unroll;
68
69 public void configure(Configuration conf) throws ConfigurationException {
70
71 Configuration[] children = conf.getChildren("exception");
72
73 this.clazz = new Class [children.length];
74 this.name = new String [children.length];
75 this.unroll = new boolean[children.length];
76
77 for (int i = 0; i < children.length; i++) {
78 Configuration child = children[i];
79
80 String childClassName = child.getAttribute("class");
81 Class childClass = null;
82 try {
83 childClass = ClassUtils.loadClass(childClassName);
84 }
85 catch (Exception e) {
86 throw new ConfigurationException("Cannot load class '" + childClassName + "' at " + child.getLocation());
87 }
88
89 for (int j = 0; j < i; j++) {
91 if (this.clazz[j].isAssignableFrom(childClass)) {
92 throw new ConfigurationException("Class '" + this.clazz[j].getName() + "' hides its subclass '" +
93 childClassName + "' at " + child.getLocation());
94 }
95 }
96
97 this.clazz[i] = childClass;
98 this.name[i] = child.getAttribute("name", null);
99 this.unroll[i] = child.getAttributeAsBoolean("unroll", false);
100
101 if (this.name[i] == null && !this.unroll[i]) {
102 throw new ConfigurationException("Must specify one of 'name' or 'unroll' at " + child.getLocation());
103 }
104 }
105 }
106
107
112 public Object getSelectorContext(Map objectModel, Parameters parameters) {
113 Throwable thr = ObjectModelHelper.getThrowable(objectModel);
115 if (thr == null) {
116 throw new IllegalStateException ("No exception in object model. ExceptionSelector can only be used in <map:handle-errors>");
117 }
118
119 return find(thr);
120 }
121
122 private FindResult find(Throwable thr) {
123 for (int i = 0; i < this.clazz.length; i++) {
125 if (this.clazz[i].isInstance(thr)) {
126
127 if (this.unroll[i]) {
130 Throwable cause = ExceptionUtils.getCause(thr);
131 if (cause != null) {
132 FindResult result = find(cause);
133 if (result != null) {
134 return result;
135 }
136 }
137 }
138
139 return new FindResult(this.name[i], thr);
141 }
142 }
143
144 return null;
146 }
147
148 public boolean select(String expression, Object selectorContext) {
149 if ( selectorContext == null ) {
150 return false;
151 }
152 boolean result = expression.equals(((FindResult)selectorContext).getName());
154
155 if (result) {
156 if (getLogger().isDebugEnabled())
157 getLogger().debug("select succesfull for condition " + selectorContext.toString());
158 }
159
160 return result;
161 }
162
163 static class FindResult {
164 private String name;
165 private Throwable throwable;
166
167 public FindResult(String name, Throwable throwable) {
168 this.name = name;
169 this.throwable = throwable;
170 }
171
172 public String getName() {
173 return this.name;
174 }
175
176 public void setName(String name) {
177 this.name = name;
178 }
179
180 public Throwable getThrowable() {
181 return this.throwable;
182 }
183
184 public void setThrowable(Throwable throwable) {
185 this.throwable = throwable;
186 }
187
188 public String toString() {
189 return this.name;
190 }
191 }
192
193 }
194 |
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