2009/04/15 - Apache HiveMind has been retired.

For more information, please explore the Attic.

Clover coverage report - Code Coverage for hivemind-lib release 1.2.1

Coverage timestamp: Fri Feb 10 2006 16:34:07 PST

FRAMES NO FRAMES

file stats:	LOC:	157		Methods:	4
	NCLOC:	102		Classes:	1

Source file

Conditionals

Statements

Methods

TOTAL

ServicePropertyFactory.java

87.5%

97.6%

100%

96.2%

1		// Copyright 2004, 2005 The Apache Software Foundation
2		//
3		// Licensed under the Apache License, Version 2.0 (the "License");
4		// you may not use this file except in compliance with the License.
5		// You may obtain a copy of the License at
6		//
7		// http://www.apache.org/licenses/LICENSE-2.0
8		//
9		// Unless required by applicable law or agreed to in writing, software
10		// distributed under the License is distributed on an "AS IS" BASIS,
11		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12		// See the License for the specific language governing permissions and
13		// limitations under the License.
14
15		package org.apache.hivemind.lib.impl;
16
17		import java.lang.reflect.Modifier;
18
19		import org.apache.hivemind.ApplicationRuntimeException;
20		import org.apache.hivemind.ServiceImplementationFactory;
21		import org.apache.hivemind.ServiceImplementationFactoryParameters;
22		import org.apache.hivemind.service.BodyBuilder;
23		import org.apache.hivemind.service.ClassFab;
24		import org.apache.hivemind.service.ClassFabUtils;
25		import org.apache.hivemind.service.ClassFactory;
26		import org.apache.hivemind.service.MethodIterator;
27		import org.apache.hivemind.service.MethodSignature;
28		import org.apache.hivemind.util.ConstructorUtils;
29		import org.apache.hivemind.util.PropertyAdaptor;
30		import org.apache.hivemind.util.PropertyUtils;
31
32		/**
33		* Factory that dynamically exposes a property of another service. A proxy is constructed that
34		* accesses the target service and obtains a property from that. The service interface of the
35		* constructed service must match the type of the exposed property.
36		*
37		* @author Howard Lewis Ship
38		*/
39		public class ServicePropertyFactory implements ServiceImplementationFactory
40		{
41		private ClassFactory _classFactory;
42
43	8	public Object createCoreServiceImplementation(
44		ServiceImplementationFactoryParameters factoryParameters)
45		{
46	8	ServicePropertyFactoryParameter p = (ServicePropertyFactoryParameter) factoryParameters
47		.getParameters().get(0);
48
49	8	Object targetService = p.getService();
50	8	String propertyName = p.getPropertyName();
51
52	8	PropertyAdaptor pa = PropertyUtils.getPropertyAdaptor(targetService, propertyName);
53
54	8	String readMethodName = pa.getReadMethodName();
55
56	8	if (readMethodName == null)
57	1	throw new ApplicationRuntimeException(ImplMessages.servicePropertyNotReadable(
58		propertyName,
59		targetService), null, p.getLocation(), null);
60	7	Class serviceInterface = factoryParameters.getServiceInterface();
61
62	7	if (!(serviceInterface.isAssignableFrom(pa.getPropertyType())))
63	1	throw new ApplicationRuntimeException(ImplMessages.servicePropertyWrongType(
64		propertyName,
65		targetService,
66		pa.getPropertyType(),
67		serviceInterface), p.getLocation(), null);
68
69		// Now we're good to go.
70
71	6	String name = ClassFabUtils.generateClassName(serviceInterface);
72
73	6	ClassFab cf = _classFactory.newClass(name, Object.class);
74
75	6	addInfrastructure(cf, targetService, serviceInterface, propertyName, readMethodName);
76
77	6	addMethods(
78		cf,
79		factoryParameters.getServiceId(),
80		serviceInterface,
81		propertyName,
82		targetService);
83
84	6	Class proxyClass = cf.createClass();
85
86	6	try
87		{
88	6	return ConstructorUtils.invokeConstructor(proxyClass, new Object[]
89		{ targetService });
90		}
91		catch (Throwable ex)
92		{
93	0	throw new ApplicationRuntimeException(ex.getMessage(), p.getLocation(), ex);
94		}
95		}
96
97	6	private void addInfrastructure(ClassFab cf, Object targetService, Class serviceInterface,
98		String propertyName, String readPropertyMethodName)
99		{
100	6	cf.addInterface(serviceInterface);
101
102	6	Class targetServiceClass = ClassFabUtils.getInstanceClass(targetService, serviceInterface);
103
104	6	cf.addField("_targetService", targetServiceClass);
105
106	6	cf.addConstructor(new Class[]
107		{ targetServiceClass }, null, "{ super(); _targetService = $1; }");
108
109	6	BodyBuilder b = new BodyBuilder();
110
111	6	b.begin();
112	6	b.addln(
113		"{0} property = _targetService.{1}();",
114		serviceInterface.getName(),
115		readPropertyMethodName);
116
117	6	b.addln("if (property == null)");
118	6	b.add(" throw new java.lang.NullPointerException(");
119	6	b.addQuoted(ImplMessages.servicePropertyWasNull(propertyName, targetService));
120	6	b.addln(");");
121
122	6	b.addln("return property;");
123
124	6	b.end();
125
126	6	MethodSignature sig = new MethodSignature(serviceInterface, "_targetServiceProperty", null,
127		null);
128	6	cf.addMethod(Modifier.FINAL \| Modifier.PRIVATE, sig, b.toString());
129		}
130
131	6	private void addMethods(ClassFab cf, String serviceId, Class serviceInterface,
132		String propertyName, Object targetService)
133		{
134	6	MethodIterator mi = new MethodIterator(serviceInterface);
135
136	6	while (mi.hasNext())
137		{
138	18	MethodSignature sig = mi.next();
139
140	18	String body = "return ($r) _targetServiceProperty()." + sig.getName() + "($$);";
141
142	18	cf.addMethod(Modifier.PUBLIC, sig, body);
143		}
144
145	6	if (!mi.getToString())
146	6	ClassFabUtils.addToStringMethod(cf, ImplMessages.servicePropertyToString(
147		serviceId,
148		serviceInterface,
149		propertyName,
150		targetService));
151		}
152
153	8	public void setClassFactory(ClassFactory factory)
154		{
155	8	_classFactory = factory;
156		}
157		}