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1
15 package org.apache.tapestry.enhance;
16
17 import java.lang.reflect.Modifier  ;
18 import java.util.Iterator ;
19
20 import org.apache.hivemind.ErrorLog;
21 import org.apache.hivemind.Location;
22 import org.apache.hivemind.service.BodyBuilder;
23 import org.apache.hivemind.service.MethodSignature;
24 import org.apache.hivemind.util.Defense;
25 import org.apache.tapestry.IBinding;
26 import org.apache.tapestry.IComponent;
27 import org.apache.tapestry.binding.BindingSource;
28 import org.apache.tapestry.event.PageDetachListener;
29 import org.apache.tapestry.spec.IComponentSpecification;
30 import org.apache.tapestry.spec.IPropertySpecification;
31
32
39 public class SpecifiedPropertyWorker implements EnhancementWorker
40 {
41 private ErrorLog _errorLog;
42
43 private BindingSource _bindingSource;
44
45
51
52 public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
53 {
54 Iterator i = spec.getPropertySpecificationNames().iterator();
55
56 while (i.hasNext())
57 {
58 String name = (String ) i.next();
59 IPropertySpecification ps = spec.getPropertySpecification(name);
60
61 try
62 {
63 performEnhancement(op, ps);
64 }
65 catch (RuntimeException ex)
66 {
67 _errorLog.error(
68 EnhanceMessages.errorAddingProperty(name, op.getBaseClass(), ex),
69 ps.getLocation(),
70 ex);
71 }
72 }
73 }
74
75 private void performEnhancement(EnhancementOperation op, IPropertySpecification ps)
76 {
77 Defense.notNull(ps, "ps");
78
79 String propertyName = ps.getName();
80 String specifiedType = ps.getType();
81 boolean persistent = ps.isPersistent();
82 String initialValue = ps.getInitialValue();
83 Location location = ps.getLocation();
84
85 addProperty(op, propertyName, specifiedType, persistent, initialValue, location);
86 }
87
88 public void addProperty(EnhancementOperation op, String propertyName, String specifiedType, boolean persistent, String initialValue, Location location)
89 {
90 Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, specifiedType);
91
92 op.claimProperty(propertyName);
93
94 String field = "_$" + propertyName;
95
96 op.addField(field, propertyType);
97
98
102 EnhanceUtils.createSimpleAccessor(op, field, propertyName, propertyType);
103
104 addMutator(op, propertyName, propertyType, field, persistent);
105
106 if (initialValue == null)
107 addReinitializer(op, propertyType, field);
108 else
109 addInitialValue(op, propertyName, propertyType, field, initialValue, location);
110 }
111
112 private void addReinitializer(EnhancementOperation op, Class propertyType, String fieldName)
113 {
114 String defaultFieldName = fieldName + "$default";
115
116 op.addField(defaultFieldName, propertyType);
117
118
120 op.extendMethodImplementation(
121 IComponent.class,
122 EnhanceUtils.FINISH_LOAD_SIGNATURE,
123 defaultFieldName + " = " + fieldName + ";");
124
125
127 op.extendMethodImplementation(
128 PageDetachListener.class,
129 EnhanceUtils.PAGE_DETACHED_SIGNATURE,
130 fieldName + " = " + defaultFieldName + ";");
131 }
132
133 private void addInitialValue(EnhancementOperation op, String propertyName, Class propertyType,
134 String fieldName, String initialValue, Location location)
135 {
136 String description = EnhanceMessages.initialValueForProperty(propertyName);
137
138 InitialValueBindingCreator creator = new InitialValueBindingCreator(_bindingSource,
139 description, initialValue, location);
140
141 String creatorField = op.addInjectedField(
142 fieldName + "$initialValueBindingCreator",
143 InitialValueBindingCreator.class,
144 creator);
145
146 String bindingField = fieldName + "$initialValueBinding";
147 op.addField(bindingField, IBinding.class);
148
149 BodyBuilder builder = new BodyBuilder();
150
151 builder.addln("{0} = {1}.createBinding(this);", bindingField, creatorField);
152
153 op.extendMethodImplementation(IComponent.class, EnhanceUtils.FINISH_LOAD_SIGNATURE, builder
154 .toString());
155
156 builder.clear();
157
158 builder.addln("{0} = {1};", fieldName, EnhanceUtils.createUnwrapExpression(
159 op,
160 bindingField,
161 propertyType));
162
163 String code = builder.toString();
164
165
168 op.extendMethodImplementation(IComponent.class, EnhanceUtils.FINISH_LOAD_SIGNATURE, code);
169 op.extendMethodImplementation(
170 PageDetachListener.class,
171 EnhanceUtils.PAGE_DETACHED_SIGNATURE,
172 code);
173
174 }
175
176 private void addMutator(EnhancementOperation op, String propertyName, Class propertyType,
177 String fieldName, boolean persistent)
178 {
179 String methodName = EnhanceUtils.createMutatorMethodName(propertyName);
180
181 BodyBuilder body = new BodyBuilder();
182
183 body.begin();
184
185 if (persistent)
186 {
187 body.add("org.apache.tapestry.Tapestry#fireObservedChange(this, ");
188 body.addQuoted(propertyName);
189 body.addln(", ($w) $1);");
190 }
191
192 body.addln(fieldName + " = $1;");
193
194 body.end();
195
196 MethodSignature sig = new MethodSignature(void.class, methodName, new Class []
197 { propertyType }, null);
198
199 op.addMethod(Modifier.PUBLIC, sig, body.toString());
200 }
201
202 public void setErrorLog(ErrorLog errorLog)
203 {
204 _errorLog = errorLog;
205 }
206
207 public void setBindingSource(BindingSource bindingSource)
208 {
209 _bindingSource = bindingSource;
210 }
211 } |
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