FELIX-3551 : Support the DS annotations

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1349925 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/scrplugin/annotations/DEPENDENCIES b/scrplugin/annotations/DEPENDENCIES
index 6f08d32..603988f 100644
--- a/scrplugin/annotations/DEPENDENCIES
+++ b/scrplugin/annotations/DEPENDENCIES
@@ -1,5 +1,5 @@
 Apache Felix SCR Annotations
-Copyright 2007-2011 The Apache Software Foundation
+Copyright 2007-2012 The Apache Software Foundation
 
 This software was developed at the Apache Software Foundation
 (http://www.apache.org) and may have dependencies on other
diff --git a/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SCRAnnotationProcessor.java b/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SCRAnnotationProcessor.java
index 271d284..3c73f5e 100644
--- a/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SCRAnnotationProcessor.java
+++ b/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SCRAnnotationProcessor.java
@@ -64,7 +64,7 @@
     /**
      * @throws SCRDescriptorException
      * @throws SCRDescriptorFailureException
-     * @see org.apache.felix.scrplugin.AnnotationProcessor#process(ScannedClass, ClassDescription)
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#process(org.apache.felix.scrplugin.annotations.ScannedClass, org.apache.felix.scrplugin.description.ClassDescription)
      */
     public void process(final ScannedClass scannedClass, final ClassDescription describedClass)
                     throws SCRDescriptorFailureException, SCRDescriptorException {
@@ -157,7 +157,7 @@
     }
 
     /**
-     * @see org.apache.felix.scrplugin.AnnotationProcessor#getRanking()
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#getRanking()
      */
     public int getRanking() {
         return 1000;
diff --git a/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SlingAnnotationProcessor.java b/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SlingAnnotationProcessor.java
index 7a760bd..b7614a2 100644
--- a/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SlingAnnotationProcessor.java
+++ b/scrplugin/annotations/src/main/java/org/apache/felix/scrplugin/processing/SlingAnnotationProcessor.java
@@ -41,7 +41,7 @@
 public class SlingAnnotationProcessor implements AnnotationProcessor {
 
     /**
-     * @see org.apache.felix.scrplugin.AnnotationProcessor#process(ScannedClass, ClassDescription)
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#process(org.apache.felix.scrplugin.annotations.ScannedClass, org.apache.felix.scrplugin.description.ClassDescription)
      */
     public void process(final ScannedClass scannedClass,
                         final ClassDescription describedClass)
@@ -64,7 +64,7 @@
     }
 
     /**
-     * @see org.apache.felix.scrplugin.AnnotationProcessor#getRanking()
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#getRanking()
      */
     public int getRanking() {
         return 500;
diff --git a/scrplugin/ds-annotations/.classpath b/scrplugin/ds-annotations/.classpath
new file mode 100644
index 0000000..30daf94
--- /dev/null
+++ b/scrplugin/ds-annotations/.classpath
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java"/>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5"/>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/scrplugin/ds-annotations/.project b/scrplugin/ds-annotations/.project
new file mode 100644
index 0000000..afadbf1
--- /dev/null
+++ b/scrplugin/ds-annotations/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.apache.felix.scr.spec-annotations</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/scrplugin/ds-annotations/.settings/org.eclipse.core.resources.prefs b/scrplugin/ds-annotations/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000..d3c1df2
--- /dev/null
+++ b/scrplugin/ds-annotations/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding//src/main/resources=UTF-8
diff --git a/scrplugin/ds-annotations/.settings/org.eclipse.jdt.core.prefs b/scrplugin/ds-annotations/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..abec6ca
--- /dev/null
+++ b/scrplugin/ds-annotations/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
+org.eclipse.jdt.core.compiler.compliance=1.5
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.5
diff --git a/scrplugin/ds-annotations/.settings/org.eclipse.m2e.core.prefs b/scrplugin/ds-annotations/.settings/org.eclipse.m2e.core.prefs
new file mode 100644
index 0000000..f897a7f
--- /dev/null
+++ b/scrplugin/ds-annotations/.settings/org.eclipse.m2e.core.prefs
@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1
diff --git a/scrplugin/ds-annotations/DEPENDENCIES b/scrplugin/ds-annotations/DEPENDENCIES
new file mode 100644
index 0000000..a58a9e8
--- /dev/null
+++ b/scrplugin/ds-annotations/DEPENDENCIES
@@ -0,0 +1,20 @@
+Apache Felix SCR DS Annotations
+Copyright 2012 The Apache Software Foundation
+
+This software was developed at the Apache Software Foundation
+(http://www.apache.org) and may have dependencies on other
+Apache software licensed under Apache License 2.0.
+
+I. Included Third-Party Software
+
+
+II. Used Third-Party Software
+
+This product uses software developed at
+The OSGi Alliance (http://www.osgi.org/).
+Copyright (c) OSGi Alliance (2000, 2012).
+Licensed under the Apache License 2.0. 
+
+
+III. License Summary
+- Apache License 2.0
diff --git a/scrplugin/ds-annotations/LICENSE b/scrplugin/ds-annotations/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/scrplugin/ds-annotations/LICENSE
@@ -0,0 +1,202 @@
+
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+                           Version 2.0, January 2004
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+
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+      the conditions stated in this License.
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+      any Contribution intentionally submitted for inclusion in the Work
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diff --git a/scrplugin/ds-annotations/NOTICE b/scrplugin/ds-annotations/NOTICE
new file mode 100644
index 0000000..bed91c8
--- /dev/null
+++ b/scrplugin/ds-annotations/NOTICE
@@ -0,0 +1,6 @@
+Apache Felix SCR DS Annotations
+Copyright 2012 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+Licensed under the Apache License 2.0.
diff --git a/scrplugin/ds-annotations/pom.xml b/scrplugin/ds-annotations/pom.xml
new file mode 100644
index 0000000..fb3e1ac
--- /dev/null
+++ b/scrplugin/ds-annotations/pom.xml
@@ -0,0 +1,92 @@
+<!-- 
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements.  See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership.  The ASF licenses this file
+ to you 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. 
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>felix-parent</artifactId>
+        <groupId>org.apache.felix</groupId>
+        <version>1.2.0</version>
+        <relativePath>../pom/pom.xml</relativePath>
+    </parent>
+    
+    <groupId>org.apache.felix</groupId>
+    <artifactId>org.apache.felix.scr.ds-annotations</artifactId>
+
+    <!-- We use the same major version as the spec. -->
+    <version>1.2.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>Annotations for DS</name>
+    <description>
+        Annotations for generating OSGi service descriptors.
+    </description>
+
+    <scm>
+        <connection>scm:svn:http://svn.apache.org/repos/asf/felix/trunk/scrplugin/ds-annotations</connection>
+        <developerConnection>scm:svn:https://svn.apache.org/repos/asf/felix/trunk/scrplugin/ds-annotations</developerConnection>
+        <url>http://svn.apache.org/repos/asf/felix/scrplugin/ds-annotations</url>
+    </scm>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.scr.generator</artifactId>
+            <version>1.2.0-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.compendium</artifactId>
+            <version>4.3.0</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <resources>
+            <resource>
+                <directory>${basedir}/src/main/resources</directory>
+            </resource>
+            <resource>
+                <targetPath>META-INF</targetPath>
+                <directory>${basedir}</directory>
+                <includes>
+                    <include>LICENSE</include>
+                    <include>NOTICE</include>
+                    <include>DEPENDENCIES</include>
+                </includes>
+            </resource>
+        </resources>
+        <plugins>
+
+          <!-- JDK 1.5 needed for annotation support -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                  <source>1.5</source>
+                  <target>1.5</target>
+                </configuration>
+            </plugin>
+            
+        </plugins>
+  </build>
+    
+</project>
diff --git a/scrplugin/ds-annotations/src/main/java/org/apache/felix/scrplugin/ds/DSAnnotationProcessor.java b/scrplugin/ds-annotations/src/main/java/org/apache/felix/scrplugin/ds/DSAnnotationProcessor.java
new file mode 100644
index 0000000..780bf70
--- /dev/null
+++ b/scrplugin/ds-annotations/src/main/java/org/apache/felix/scrplugin/ds/DSAnnotationProcessor.java
@@ -0,0 +1,274 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.felix.scrplugin.ds;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.felix.scrplugin.SCRDescriptorException;
+import org.apache.felix.scrplugin.SCRDescriptorFailureException;
+import org.apache.felix.scrplugin.annotations.AnnotationProcessor;
+import org.apache.felix.scrplugin.annotations.ClassAnnotation;
+import org.apache.felix.scrplugin.annotations.MethodAnnotation;
+import org.apache.felix.scrplugin.annotations.ScannedClass;
+import org.apache.felix.scrplugin.description.ClassDescription;
+import org.apache.felix.scrplugin.description.ComponentConfigurationPolicy;
+import org.apache.felix.scrplugin.description.ComponentDescription;
+import org.apache.felix.scrplugin.description.MethodDescription;
+import org.apache.felix.scrplugin.description.ReferenceCardinality;
+import org.apache.felix.scrplugin.description.ReferenceDescription;
+import org.apache.felix.scrplugin.description.ReferencePolicy;
+import org.apache.felix.scrplugin.description.ReferenceStrategy;
+import org.apache.felix.scrplugin.description.ServiceDescription;
+import org.apache.felix.scrplugin.description.SpecVersion;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Modified;
+import org.osgi.service.component.annotations.Reference;
+
+/**
+ * This is the processor for the DS annotations.
+ */
+public class DSAnnotationProcessor implements AnnotationProcessor {
+
+    /**
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#process(org.apache.felix.scrplugin.annotations.ScannedClass, org.apache.felix.scrplugin.description.ClassDescription)
+     */
+    public void process(final ScannedClass scannedClass,
+                        final ClassDescription describedClass)
+    throws SCRDescriptorFailureException, SCRDescriptorException {
+        final List<ClassAnnotation> componentTags = scannedClass.getClassAnnotations(Component.class.getName());
+        scannedClass.processed(componentTags);
+
+        for (final ClassAnnotation cad : componentTags) {
+            this.createComponent(cad, describedClass, scannedClass);
+        }
+
+        // search for the component descriptions and use the first one
+        final List<ComponentDescription> componentDescs = describedClass.getDescriptions(ComponentDescription.class);
+        ComponentDescription found = null;
+        if (!componentDescs.isEmpty()) {
+            found = componentDescs.get(0);
+        }
+
+        if (found != null) {
+            final ComponentDescription cd = found;
+
+            // search for methods
+            final List<MethodAnnotation> methodTags = scannedClass.getMethodAnnotations(null);
+            for (final MethodAnnotation m : methodTags) {
+                if (m.getName().equals(Activate.class.getName())) {
+                    cd.setActivate(new MethodDescription(m.getAnnotatedMethod()));
+                    scannedClass.processed(m);
+                } else if (m.getName().equals(Deactivate.class.getName())) {
+                    cd.setDeactivate(new MethodDescription(m.getAnnotatedMethod()));
+                    scannedClass.processed(m);
+                } else if (m.getName().equals(Modified.class.getName())) {
+                    cd.setModified(new MethodDescription(m.getAnnotatedMethod()));
+                    scannedClass.processed(m);
+                } else if (m.getName().equals(Reference.class.getName()) ) {
+                    this.processReference(describedClass, m);
+                    scannedClass.processed(m);
+                }
+            }
+
+        }
+    }
+
+    /**
+     * @see org.apache.felix.scrplugin.annotations.AnnotationProcessor#getRanking()
+     */
+    public int getRanking() {
+        return 300;
+    }
+
+    /**
+     * Create a component description.
+     *
+     * @param cad The component annotation for the class.
+     * @param scannedClass The scanned class.
+     */
+    private ComponentDescription createComponent(final ClassAnnotation cad,
+                    final ClassDescription describedClass,
+                    final ScannedClass scannedClass)
+    throws SCRDescriptorException {
+        final ComponentDescription component = new ComponentDescription(cad);
+        describedClass.add(component);
+
+        // Although not defined in the spec, we support abstract classes.
+        final boolean classIsAbstract = Modifier.isAbstract(scannedClass.getClass().getModifiers());
+        component.setAbstract(classIsAbstract);
+
+        // name
+        component.setName(cad.getStringValue("name", scannedClass.getScannedClass().getName()));
+
+        // services
+        final List<String> listedInterfaces = new ArrayList<String>();
+        if (cad.getValue("service") != null) {
+            final String[] interfaces = (String[]) cad.getValue("service");
+            for (final String t : interfaces) {
+                listedInterfaces.add(t);
+            }
+        } else {
+            // scan directly implemented interfaces
+            this.searchInterfaces(listedInterfaces, scannedClass.getScannedClass());
+        }
+        if ( listedInterfaces.size() > 0 ) {
+            final ServiceDescription serviceDesc = new ServiceDescription(cad);
+            describedClass.add(serviceDesc);
+
+            for(final String name : listedInterfaces) {
+                serviceDesc.addInterface(name);
+            }
+            serviceDesc.setServiceFactory(cad.getBooleanValue("servicefactory", false));
+        }
+
+        // factory
+        component.setFactory(cad.getStringValue("factory", null));
+
+        // enabled
+        if (cad.getValue("enabled") != null) {
+            component.setEnabled(cad.getBooleanValue("enabled", true));
+        }
+
+        // immediate
+        if (cad.getValue("immediate") != null) {
+            component.setEnabled(cad.getBooleanValue("immediate", false));
+        }
+
+        // TODO: property/properties
+
+        // xmlns
+        if (cad.getValue("xmlns") != null) {
+            final SpecVersion spec = SpecVersion.fromNamespaceUrl(cad.getValue("xmlns").toString());
+            if ( spec == null ) {
+                throw new SCRDescriptorException("Unknown xmlns attribute value: " + cad.getValue("xmlns"),
+                                describedClass.getSource(), -1);
+            }
+            component.setSpecVersion(spec);
+        }
+
+        // configuration policy
+        component.setConfigurationPolicy(ComponentConfigurationPolicy.valueOf(cad.getEnumValue("policy",
+                        ComponentConfigurationPolicy.OPTIONAL.name())));
+
+        // configuration pid (TODO)
+        component.setCreatePid(cad.getBooleanValue("createPid", true));
+
+        // no inheritance
+        component.setInherit(false);
+
+        return component;
+    }
+
+    /**
+     * Get all directly implemented interfaces
+     */
+    private void searchInterfaces(final List<String> interfaceList, final Class<?> javaClass) {
+        final Class<?>[] interfaces = javaClass.getInterfaces();
+        for (final Class<?> i : interfaces) {
+            interfaceList.add(i.getName());
+        }
+    }
+
+    /**
+     * Process a reference
+     */
+    private void processReference(final ClassDescription describedClass, final MethodAnnotation ad) {
+        final ReferenceDescription ref = new ReferenceDescription(ad);
+        describedClass.add(ref);
+
+        ref.setStrategy(ReferenceStrategy.EVENT);
+
+        final String methodName = ad.getAnnotatedMethod().getName();
+        final String defaultUnbindMethodName;
+        final String refNameByMethod;
+        if ( methodName.startsWith("add") ) {
+            refNameByMethod = methodName.substring(3);
+            defaultUnbindMethodName = "remove" + refNameByMethod;
+        } else if ( methodName.startsWith("set") ) {
+            refNameByMethod = methodName.substring(3);
+            defaultUnbindMethodName = "un" + refNameByMethod;
+        } else if ( methodName.startsWith("bind") ) {
+            refNameByMethod = methodName.substring(4);
+            defaultUnbindMethodName = "un" + refNameByMethod;
+        } else {
+            refNameByMethod = methodName;
+            defaultUnbindMethodName = "un" + refNameByMethod;
+        }
+        final String defaultUpdateMethodName = "updated" + refNameByMethod;
+
+        // bind method
+        ref.setBind(new MethodDescription(ad.getAnnotatedMethod()));
+        // unbind method
+        final String unbind = ad.getStringValue("unbind",
+                        this.hasMethod(describedClass, defaultUnbindMethodName) ? defaultUnbindMethodName : "-");
+        if ( !unbind.equals("-") ) {
+            ref.setUnbind(new MethodDescription(unbind));
+        }
+        // update method
+        final String update = ad.getStringValue("updated",
+                        this.hasMethod(describedClass, defaultUpdateMethodName) ? defaultUpdateMethodName : "-");
+        if ( !update.equals("-") ) {
+            ref.setUpdated(new MethodDescription(update));
+        }
+
+        // name
+        ref.setName(ad.getStringValue("name", refNameByMethod));
+        // service
+        final String serviceName = ad.getStringValue("service", null);
+        if ( serviceName != null ) {
+            ref.setInterfaceName(serviceName);
+        } else {
+            final Class<?>[] params = ad.getAnnotatedMethod().getParameterTypes();
+            if ( params != null && params.length > 0 ) {
+                ref.setInterfaceName(params[0].getName());
+            }
+        }
+        // cardinality
+        final String cardinality = ad.getEnumValue("cardinality", "MANDATORY");
+        if ( cardinality.equals("OPTIONAL") ) {
+            ref.setCardinality(ReferenceCardinality.OPTIONAL_UNARY);
+        } else if ( cardinality.equals("MULTIPLE") ) {
+            ref.setCardinality(ReferenceCardinality.OPTIONAL_MULTIPLE);
+        } else if ( cardinality.equals("AT_LEAST_ONE") ) {
+            ref.setCardinality(ReferenceCardinality.MANDATORY_MULTIPLE);
+        } else {
+            ref.setCardinality(ReferenceCardinality.MANDATORY_UNARY);
+        }
+
+        // policy
+        ref.setPolicy(ReferencePolicy.valueOf(ad.getEnumValue("policy", ReferencePolicy.STATIC.name())));
+        // target
+        ref.setTarget(ad.getStringValue("target", null));
+    }
+
+    private boolean hasMethod(final ClassDescription classDescription, final String name) {
+        final Method[] allMethods = classDescription.getDescribedClass().getDeclaredMethods();
+        for(final Method m : allMethods) {
+            if ( m.getName().equals(name) ) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/scrplugin/ds-annotations/src/main/resources/META-INF/services/org.apache.felix.scrplugin.annotations.AnnotationProcessor b/scrplugin/ds-annotations/src/main/resources/META-INF/services/org.apache.felix.scrplugin.annotations.AnnotationProcessor
new file mode 100644
index 0000000..8303823
--- /dev/null
+++ b/scrplugin/ds-annotations/src/main/resources/META-INF/services/org.apache.felix.scrplugin.annotations.AnnotationProcessor
@@ -0,0 +1 @@
+org.apache.felix.scrplugin.ds.DSAnnotationProcessor
diff --git a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/ReferenceDescription.java b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/ReferenceDescription.java
index 03d8b09..b7c18eb 100644
--- a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/ReferenceDescription.java
+++ b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/ReferenceDescription.java
@@ -35,11 +35,11 @@
  * <li>cardinality</li>
  * <li>policy</li>
  * <li>strategy</li>
- * <li>field</li>
  * </ul>
  *
  * These values have the following default values:
  * <ul>
+ * <li>field :  null</li>
  * <li>bind : null</li>
  * <li>unbind : null</li>
  * <li>updated : null</li>
diff --git a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/SpecVersion.java b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/SpecVersion.java
index 1f0d11a..21558d8 100644
--- a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/SpecVersion.java
+++ b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/description/SpecVersion.java
@@ -16,9 +16,9 @@
 
 public enum SpecVersion {
 
-    VERSION_1_0("1.0"),              // R4.1
-    VERSION_1_1("1.1"),              // R4.2
-    VERSION_1_1_FELIX("1.1_FELIX");  // R4.2 + FELIX-1893
+    VERSION_1_0("1.0", "http://www.osgi.org/xmlns/scr/v1.0.0"),                        // R4.1
+    VERSION_1_1("1.1", "http://www.osgi.org/xmlns/scr/v1.1.0"),                        // R4.2
+    VERSION_1_1_FELIX("1.1_FELIX", "http://felix.apache.org/xmlns/scr/v1.1.0-felix");  // R4.2 + FELIX-1893
 
     /**
      * internal human readable name
@@ -26,12 +26,19 @@
     private final String name;
 
     /**
+     * Namespace url
+     */
+    private final String namespaceUrl;
+
+    /**
      * Create a type
      *
-     * @param name name
+     * @param name A human readable name
+     * @param namespaceUrl The namespace URL for this spec version
      */
-    private SpecVersion(final String name) {
+    private SpecVersion(final String name, final String namespaceUrl) {
         this.name = name;
+        this.namespaceUrl = namespaceUrl;
     }
 
     /**
@@ -44,7 +51,15 @@
     }
 
     /**
-     * Creates a version for the given name. if the name cannot be mapped
+     * Return the namespace url.
+     * @return The namespace url.
+     */
+    public String getNamespaceUrl() {
+        return this.namespaceUrl;
+    }
+
+    /**
+     * Creates a version for the given name. If the name cannot be mapped
      * to a enum type or if it's <code>null</code>, <code>null</code> is
      * returned.
      *
@@ -67,4 +82,24 @@
         }
         return null;
     }
+
+    /**
+     * Creates a version for the given url. If the url cannot be mapped
+     * to a enum type or if it's <code>null</code>, <code>null</code> is
+     * returned.
+     *
+     * @param n the url
+     * @return the type or <code>null</code>
+     */
+    public static SpecVersion fromNamespaceUrl(final String n) {
+        if (n == null) {
+            return null;
+        }
+        for(final SpecVersion sv : SpecVersion.values() ) {
+            if ( sv.getNamespaceUrl().equals(n)) {
+                return sv;
+            }
+        }
+        return null;
+    }
 }
diff --git a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/xml/ComponentDescriptorIO.java b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/xml/ComponentDescriptorIO.java
index 33d1c97..7ea5bc9 100644
--- a/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/xml/ComponentDescriptorIO.java
+++ b/scrplugin/generator/src/main/java/org/apache/felix/scrplugin/xml/ComponentDescriptorIO.java
@@ -61,15 +61,6 @@
  */
 public class ComponentDescriptorIO {
 
-    /** The namespace for R4.1 - Version 1.0 */
-    public static final String NAMESPACE_URI_1_0 = "http://www.osgi.org/xmlns/scr/v1.0.0";
-
-    /** The namespace for R4.2 - Version 1.1 */
-    public static final String NAMESPACE_URI_1_1 = "http://www.osgi.org/xmlns/scr/v1.1.0";
-
-    /** The namespace for R4.2+FELIX-1893 - Version 1.1-felix */
-    public static final String NAMESPACE_URI_1_1_FELIX = "http://felix.apache.org/xmlns/scr/v1.1.0-felix";
-
     /** The inner namespace - used for all inner elements. */
     public static final String INNER_NAMESPACE_URI = "";
 
@@ -170,14 +161,8 @@
      */
     protected static void generateXML(Components components, ContentHandler contentHandler) throws SAXException {
         // detect namespace to use
-        final String namespace;
-        if (components.getSpecVersion() == SpecVersion.VERSION_1_0) {
-            namespace = NAMESPACE_URI_1_0;
-        } else if (components.getSpecVersion() == SpecVersion.VERSION_1_1) {
-            namespace = NAMESPACE_URI_1_1;
-        } else {
-            namespace = NAMESPACE_URI_1_1_FELIX;
-        }
+        final String namespace = components.getSpecVersion().getNamespaceUrl();
+
         contentHandler.startDocument();
         contentHandler.startPrefixMapping(PREFIX, namespace);
 
@@ -213,7 +198,7 @@
         IOUtils.addAttribute(ai, COMPONENT_ATTR_FACTORY, component.getFactory());
 
         // attributes new in 1.1
-        if (NAMESPACE_URI_1_1.equals(namespace) || NAMESPACE_URI_1_1_FELIX.equals(namespace)) {
+        if (SpecVersion.VERSION_1_1.getNamespaceUrl().equals(namespace) || SpecVersion.VERSION_1_1_FELIX.getNamespaceUrl().equals(namespace)) {
             if ( component.getConfigurationPolicy() != ComponentConfigurationPolicy.OPTIONAL ) {
                 IOUtils.addAttribute(ai, COMPONENT_ATTR_POLICY, component.getConfigurationPolicy().name());
             }
@@ -350,7 +335,7 @@
         IOUtils.addAttribute(ai, "unbind", reference.getUnbind());
 
         // attributes new in 1.1-felix (FELIX-1893)
-        if (NAMESPACE_URI_1_1_FELIX.equals(namespace)) {
+        if (SpecVersion.VERSION_1_1_FELIX.getNamespaceUrl().equals(namespace)) {
             IOUtils.addAttribute(ai, "updated", reference.getUpdated());
         }
 
@@ -420,7 +405,7 @@
             if (this.firstElement) {
                 this.firstElement = false;
                 if (localName.equals(COMPONENT) && "".equals(uri)) {
-                    this.overrideNamespace = NAMESPACE_URI_1_0;
+                    this.overrideNamespace = SpecVersion.VERSION_1_0.getNamespaceUrl();
                 }
             }
 
@@ -432,19 +417,12 @@
             // of a component are unqualified, so they don't have
             // the namespace - we allow both: with or without namespace!
             if (this.isComponent && "".equals(uri)) {
-                uri = NAMESPACE_URI_1_0;
+                uri = SpecVersion.VERSION_1_0.getNamespaceUrl();
             }
 
             // from here on, uri has the namespace regardless of the used xml format
-            if (NAMESPACE_URI_1_0.equals(uri) || NAMESPACE_URI_1_1.equals(uri) || NAMESPACE_URI_1_1_FELIX.equals(uri)) {
-
-                if (NAMESPACE_URI_1_0.equals(uri)) {
-                    specVersion = SpecVersion.VERSION_1_0;
-                } else if (NAMESPACE_URI_1_1.equals(uri)) {
-                    specVersion = SpecVersion.VERSION_1_1;
-                } else if (NAMESPACE_URI_1_1_FELIX.equals(uri)) {
-                    specVersion = SpecVersion.VERSION_1_1_FELIX;
-                }
+            specVersion = SpecVersion.fromNamespaceUrl(uri);
+            if (specVersion != null) {
 
                 if (localName.equals(COMPONENT)) {
                     this.isComponent = true;
@@ -601,10 +579,10 @@
             }
 
             if (this.isComponent && "".equals(uri)) {
-                uri = NAMESPACE_URI_1_0;
+                uri = SpecVersion.VERSION_1_0.getNamespaceUrl();
             }
 
-            if (NAMESPACE_URI_1_0.equals(uri) || NAMESPACE_URI_1_1.equals(uri) || NAMESPACE_URI_1_1_FELIX.equals(uri)) {
+            if (SpecVersion.fromNamespaceUrl(uri) != null) {
                 if (localName.equals(COMPONENT)) {
                     this.currentClass = null;
                     this.currentComponent = null;