/
ComponentExtensionManagerGenerator.java
180 lines (158 loc) · 8.21 KB
/
ComponentExtensionManagerGenerator.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.switchyard.console.components.rebind;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.switchyard.console.components.client.extension.ComponentExtension;
import org.switchyard.console.components.client.extension.ComponentProvider;
import org.switchyard.console.components.client.internal.ComponentExtensionManager;
import org.switchyard.console.components.client.internal.ComponentProviderProxyImpl;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.inject.Inject;
/**
* ComponentExtensionManagerGenerator
*
* GWT code generator for ComponentExtensionManager. A code generator is used
* because reflection cannot be used on the client side. This generator scans
* for classes annotated with ComponentExtension and adds them to the manager.
*
* @author Rob Cernich
*/
public class ComponentExtensionManagerGenerator extends Generator {
@Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName)
throws UnableToCompleteException {
TypeOracle typeOracle = context.getTypeOracle();
JClassType componentExtensionManager = typeOracle.findType(typeName);
if (componentExtensionManager == null) {
logger.log(TreeLogger.ERROR, "Unable to find metadata for type '" + typeName + "'", null);
throw new UnableToCompleteException();
}
if (componentExtensionManager.isInterface() == null) {
logger.log(TreeLogger.ERROR, componentExtensionManager.getQualifiedSourceName() + " is not an interface",
null);
throw new UnableToCompleteException();
}
JClassType componentProvider = typeOracle.findType(ComponentProvider.class.getCanonicalName());
if (componentProvider == null) {
logger.log(TreeLogger.ERROR, "Unable to find metadata for type 'ComponentProvider'", null);
throw new UnableToCompleteException();
}
List<JClassType> componentExtensionClasses = new ArrayList<JClassType>();
for (JClassType type : typeOracle.getTypes()) {
if (type.isAnnotationPresent(ComponentExtension.class)) {
if (type.isClass() == null || type.isAbstract()) {
// type must be a class that can be instantiated
logger.log(TreeLogger.ERROR, "ComponentExtension type '" + type.getQualifiedSourceName()
+ "' cannot be instantiated.", null);
throw new UnableToCompleteException();
} else if (!type.isDefaultInstantiable()) {
// type must have default constructor
logger.log(TreeLogger.ERROR, "ComponentExtension type '" + type.getQualifiedSourceName()
+ "' does not provide a default constructor.", null);
throw new UnableToCompleteException();
} else if (!type.isAssignableTo(componentProvider)) {
// type must implement ComponentProvider
logger.log(TreeLogger.ERROR, "ComponentExtension type '" + type.getQualifiedSourceName()
+ "' does not implement ComponentProvider.", null);
throw new UnableToCompleteException();
}
componentExtensionClasses.add(type);
}
}
String packageName = componentExtensionManager.getPackage().getName();
String className = componentExtensionManager.getSimpleSourceName() + "Impl";
generateClass(logger, context, packageName, className, componentExtensionClasses);
return packageName + "." + className;
}
private void generateClass(TreeLogger logger, GeneratorContext context, String packageName, String className,
List<JClassType> componentExtensionClasses) {
PrintWriter pw = context.tryCreate(logger, packageName, className);
if (pw == null) {
return;
}
ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(packageName, className);
// imports
composerFactory.addImport(HashMap.class.getCanonicalName());
composerFactory.addImport(Map.class.getCanonicalName());
composerFactory.addImport(ComponentProvider.class.getCanonicalName());
composerFactory.addImport(ComponentExtensionManager.class.getCanonicalName());
composerFactory.addImport(ComponentProviderProxyImpl.class.getCanonicalName());
composerFactory.addImport(GWT.class.getCanonicalName());
composerFactory.addImport(Inject.class.getCanonicalName());
// interface
composerFactory.addImplementedInterface(ComponentExtensionManager.class.getCanonicalName());
SourceWriter sw = composerFactory.createSourceWriter(context, pw);
// fields
sw.println("private Map<String, ComponentProviderProxy> _providers = new HashMap<String, ComponentProviderProxy>();");
sw.println("private Map<String, String> _typeToName = new HashMap<String, String>();");
// constructor
sw.println("public " + className + "() {");
sw.indent();
for (JClassType extensionClass : componentExtensionClasses) {
ComponentExtension extensionAnnotation = extensionClass.getAnnotation(ComponentExtension.class);
sw.println("_providers.put(\"" + extensionAnnotation.componentName()
+ "\", new ComponentProviderProxyImpl(\"" + extensionAnnotation.displayName() + "\") {");
sw.indent();
sw.println("public ComponentProvider instantiate() {");
sw.indentln("return GWT.create(" + extensionClass.getQualifiedSourceName() + ".class);");
sw.println("}");
sw.outdent();
sw.println("});");
for (String type : extensionAnnotation.activationTypes()) {
sw.println("_typeToName.put(\"" + type + "\", \"" + extensionAnnotation.componentName() + "\");");
}
}
sw.outdent();
sw.println("}");
// methods
// getExtensionProviders
sw.println("public Map<String, ComponentProviderProxy> getExtensionProviders() {");
sw.indentln("return _providers;");
sw.println("}");
// getExtensionProviderByComponentName
sw.println("public ComponentProviderProxy getExtensionProviderByComponentName(String componentName) {");
sw.indent();
sw.println("if (_providers.containsKey(componentName)) {");
sw.indentln("return _providers.get(componentName);");
sw.println("}");
sw.println("return null;");
sw.outdent();
sw.println("}");
// getExtensionProviderByTypeName
sw.println("public ComponentProviderProxy getExtensionProviderByTypeName(String typeName) {");
sw.indent();
sw.println("if (_typeToName.containsKey(typeName)) {");
sw.indentln("return getExtensionProviderByComponentName(_typeToName.get(typeName));");
sw.println("}");
sw.println("return null;");
sw.outdent();
sw.println("}");
// close it out
sw.outdent();
sw.println("}");
context.commit(logger, pw);
}
}