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1
15 package org.apache.tapestry.enhance;
16
17 import java.lang.reflect.Modifier  ;
18 import java.util.HashMap ;
19 import java.util.Map ;
20
21 import org.apache.hivemind.service.BodyBuilder;
22 import org.apache.hivemind.service.ClassFabUtils;
23 import org.apache.hivemind.service.MethodSignature;
24 import org.apache.hivemind.util.Defense;
25 import org.apache.tapestry.coerce.ValueConverter;
26 import org.apache.tapestry.services.ComponentPropertySource;
27 import org.apache.tapestry.spec.InjectSpecification;
28
29
37 public class InjectMetaWorker implements InjectEnhancementWorker
38 {
39 static final String SOURCE_NAME = "_$componentPropertySource";
40
41 private ComponentPropertySource _source;
42
43 private ValueConverter _valueConverter;
44
45 private Map _primitiveParser = new HashMap ();
46
47 {
48 _primitiveParser.put(boolean.class, "java.lang.Boolean.valueOf");
49 _primitiveParser.put(short.class, "java.lang.Short.parseShort");
50 _primitiveParser.put(int.class, "java.lang.Integer.parseInt");
51 _primitiveParser.put(long.class, "java.lang.Long.parseLong");
52 _primitiveParser.put(double.class, "java.lang.Double.parseDouble");
53 _primitiveParser.put(float.class, "java.lang.Float.parseFloat");
54 }
55
56 public void performEnhancement(EnhancementOperation op, InjectSpecification spec)
57 {
58 String propertyName = spec.getProperty();
59 String metaKey = spec.getObject();
60
61 injectMetaValue(op, propertyName, metaKey);
62 }
63
64 public void injectMetaValue(EnhancementOperation op, String propertyName, String metaKey)
65 {
66 Defense.notNull(op, "op");
67 Defense.notNull(propertyName, "propertyName");
68 Defense.notNull(metaKey, "metaKey");
69
70 Class propertyType = op.getPropertyType(propertyName);
71
72 op.claimProperty(propertyName);
73
74 String sourceName = op
75 .addInjectedField(SOURCE_NAME, ComponentPropertySource.class, _source);
76
77 MethodSignature sig = new MethodSignature(propertyType, op
78 .getAccessorMethodName(propertyName), null, null);
79
80 String parser = (String ) _primitiveParser.get(propertyType);
81
82 if (parser != null)
83 {
84 addPrimitive(op, metaKey, propertyName, sig, sourceName, parser);
85 return;
86 }
87
88 if (propertyType == char.class)
89 {
90 addCharacterPrimitive(op, metaKey, propertyName, sig, sourceName);
91 return;
92 }
93
94 addObject(op, metaKey, propertyName, propertyType, sig, sourceName);
95 }
96
97 private void addPrimitive(EnhancementOperation op, String metaKey, String propertyName,
98 MethodSignature sig, String sourceName, String parser)
99 {
100 BodyBuilder builder = new BodyBuilder();
101 builder.begin();
102 builder.addln(
103 "java.lang.String meta = {0}.getComponentProperty(this, \"{1}\");",
104 sourceName,
105 metaKey);
106 builder.addln("return {0}(meta);", parser);
107 builder.end();
108
109 op.addMethod(Modifier.PUBLIC, sig, builder.toString());
110 }
111
112 private void addCharacterPrimitive(EnhancementOperation op, String metaKey,
113 String propertyName, MethodSignature sig, String sourceName)
114 {
115 BodyBuilder builder = new BodyBuilder();
116 builder.begin();
117 builder.addln(
118 "java.lang.String meta = {0}.getComponentProperty(this, \"{1}\");",
119 sourceName,
120 metaKey);
121 builder.addln("return meta.charAt(0);");
122 builder.end();
123
124 op.addMethod(Modifier.PUBLIC, sig, builder.toString());
125 }
126
127 private void addObject(EnhancementOperation op, String metaKey, String propertyName,
128 Class propertyType, MethodSignature sig, String sourceName)
129 {
130 String valueConverterName = op.addInjectedField(
131 "_$valueConverter",
132 ValueConverter.class,
133 _valueConverter);
134 String classRef = op.getClassReference(propertyType);
135
136 BodyBuilder builder = new BodyBuilder();
137 builder.begin();
138 builder.addln(
139 "java.lang.String meta = {0}.getComponentProperty(this, \"{1}\");",
140 sourceName,
141 metaKey);
142 builder.addln("return ({0}) {1}.coerceValue(meta, {2});", ClassFabUtils
143 .getJavaClassName(propertyType), valueConverterName, classRef);
144 builder.end();
145
146 op.addMethod(Modifier.PUBLIC, sig, builder.toString());
147 }
148
149 public void setSource(ComponentPropertySource source)
150 {
151 _source = source;
152 }
153
154 public void setValueConverter(ValueConverter valueConverter)
155 {
156 _valueConverter = valueConverter;
157 }
158 }
159 |
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