9:39 p.m.
Author: swd847
Date: 2010-07-17 22:39:25 -0400 (Sat, 17 Jul 2010)
New Revision: 6714
Added:
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanDefinition.java
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanExtension.java
Modified:
extensions/trunk/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension
Log:
Add default bean extension
Added:
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanDefinition.java
===================================================================
---
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanDefinition.java
(rev 0)
+++
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanDefinition.java 2010-07-18
02:39:25 UTC (rev 6714)
@@ -0,0 +1,70 @@
+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2010, Red Hat, Inc., and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual 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.jboss.weld.extensions.defaultbean;
+
+import java.lang.annotation.Annotation;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.enterprise.inject.spi.Bean;
+
+class DefaultBeanDefinition
+{
+ private final Class<?> type;
+ private final Set<? extends Annotation> qualifiers;
+ private final Bean<?> defaultBean;
+
+ public DefaultBeanDefinition(Class<?> type, Set<? extends Annotation>
qualifiers, Bean<?> defaultBean)
+ {
+ this.type = type;
+ this.qualifiers = new HashSet<Annotation>(qualifiers);
+ this.defaultBean = defaultBean;
+ }
+
+ public boolean matches(Bean<?> bean)
+ {
+ if (bean.getTypes().contains(type))
+ {
+ for (Annotation a : qualifiers)
+ {
+ if (!bean.getQualifiers().contains(a))
+ {
+ return false;
+ }
+ }
+ return true;
+ }
+ return false;
+ }
+
+ public Bean<?> getDefaultBean()
+ {
+ return defaultBean;
+ }
+
+ public Class<?> getType()
+ {
+ return type;
+ }
+
+ public Set<? extends Annotation> getQualifiers()
+ {
+ return Collections.unmodifiableSet(qualifiers);
+ }
+
+}
Added:
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanExtension.java
===================================================================
---
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanExtension.java
(rev 0)
+++
extensions/trunk/src/main/java/org/jboss/weld/extensions/defaultbean/DefaultBeanExtension.java 2010-07-18
02:39:25 UTC (rev 6714)
@@ -0,0 +1,96 @@
+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2010, Red Hat, Inc., and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual 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.jboss.weld.extensions.defaultbean;
+
+import java.lang.annotation.Annotation;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+import javax.enterprise.event.Observes;
+import javax.enterprise.inject.Alternative;
+import javax.enterprise.inject.Default;
+import javax.enterprise.inject.spi.AfterBeanDiscovery;
+import javax.enterprise.inject.spi.Bean;
+import javax.enterprise.inject.spi.Extension;
+import javax.enterprise.inject.spi.ProcessBean;
+
+import org.jboss.weld.extensions.literal.DefaultLiteral;
+
+/**
+ * This extension allows you to register a 'Default Bean' for a given type and
+ * qualifiers. If no bean with the given type and qualifiers is installed then
+ * this extensions installs the default bean.
+ *
+ * In some ways this is similar to the functionality provided by
+ * {@link Alternative} however there are some important distinctions
+ * <ul>
+ * <li>No XML is required, if an alternative implementation is available it is
+ * used automatically</li>
+ * <li>The bean is registered across all modules, not on a per module
basis</li>
+ * </ul>
+ *
+ * It is also important to note that beans registered in the
+ * {@link AfterBeanDiscovery} event may not been see by this extension
+ *
+ * @author Stuart Douglas
+ *
+ */
+public class DefaultBeanExtension implements Extension
+{
+
+ private static final Set<DefaultBeanDefinition> beans = new
HashSet<DefaultBeanDefinition>();
+
+ /**
+ * Adds a default bean with the {@link Default} qualifier
+ */
+ public static void addDefaultBean(Class<?> type, Bean<?> bean)
+ {
+ beans.add(new DefaultBeanDefinition(type,
Collections.singleton(DefaultLiteral.INSTANCE), bean));
+ }
+
+ /**
+ * Adds a default bean
+ */
+ public static void addDefaultBean(Class<?> type, Set<Annotation>
qualifiers, Bean<?> bean)
+ {
+ beans.add(new DefaultBeanDefinition(type,
Collections.singleton(DefaultLiteral.INSTANCE), bean));
+ }
+
+ public void processBean(@Observes ProcessBean<?> event)
+ {
+ Iterator<DefaultBeanDefinition> it = beans.iterator();
+ while (it.hasNext())
+ {
+ DefaultBeanDefinition definition = it.next();
+ if (definition.matches(event.getBean()))
+ {
+ it.remove();
+ }
+ }
+ }
+
+ public void afterBeanDiscovery(@Observes AfterBeanDiscovery event)
+ {
+ for (DefaultBeanDefinition d : beans)
+ {
+ event.addBean(d.getDefaultBean());
+ }
+ }
+
+}
Modified:
extensions/trunk/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension
===================================================================
---
extensions/trunk/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension 2010-07-18
01:17:41 UTC (rev 6713)
+++
extensions/trunk/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension 2010-07-18
02:39:25 UTC (rev 6714)
@@ -4,4 +4,5 @@
org.jboss.weld.extensions.core.CoreExtension
org.jboss.weld.extensions.interceptor.InterceptorExtension
org.jboss.weld.extensions.managedproducer.ManagedProducerExtension
-org.jboss.weld.extensions.autoproxy.AutoProxyExtension
\ No newline at end of file
+org.jboss.weld.extensions.autoproxy.AutoProxyExtension
+org.jboss.weld.extensions.defaultbean.DefaultBeanExtension
\ No newline at end of file