added InstanciationStrategy enumeration

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1337592 13f79535-47bb-0310-9956-ffa450edef68

maven-plugin-annotations/src/main/java/org/apache/maven/plugins/annotations/InstanciationStrategy.java

@@ -0,0 +1,44 @@
+package org.apache.maven.plugins.annotations;
+
+/*
+ * 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.
+ */
+
+/**
+ * @author Hervé Boutemy
+ * @since 3.0
+ */
+public enum InstanciationStrategy
+{
+    PER_LOOKUP( "per-lookup" ),
+    SINGLETON( "singleton" ),
+    KEEP_ALIVE( "keep-alive" ),
+    POOLABLE( "poolable" );
+
+    private final String id;
+
+    InstanciationStrategy( String id )
+    {
+        this.id = id;
+    }
+
+    public String id()
+    {
+        return this.id;
+    }
+}

maven-plugin-annotations/src/main/java/org/apache/maven/plugins/annotations/Mojo.java

@@ -44,7 +44,7 @@ public @interface Mojo
 
     DependencyScope requiresDependencyCollection() default DependencyScope.RUNTIME;
 
-    String instantiationStrategy() default "per-lookup";
+    InstanciationStrategy instantiationStrategy() default InstanciationStrategy.PER_LOOKUP;
 
     String executionStrategy() default "once-per-session";
 

maven-plugin-tools-annotations/src/main/java/org/apache/maven/tools/plugin/annotations/datamodel/MojoAnnotationContent.java

@@ -20,6 +20,7 @@ package org.apache.maven.tools.plugin.annotations.datamodel;
  */
 
 import org.apache.maven.plugins.annotations.DependencyScope;
+import org.apache.maven.plugins.annotations.InstanciationStrategy;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 
@@ -41,7 +42,7 @@ public class MojoAnnotationContent
 
     private DependencyScope requiresDependencyCollection = DependencyScope.RUNTIME;
 
-    private String instantiationStrategy = "per-lookup";
+    private InstanciationStrategy instantiationStrategy = InstanciationStrategy.PER_LOOKUP;
 
     private String executionStrategy = "once-per-session";
 
@@ -96,12 +97,12 @@ public class MojoAnnotationContent
         this.requiresDependencyCollection = requiresDependencyCollection;
     }
 
-    public String instantiationStrategy()
+    public InstanciationStrategy instantiationStrategy()
     {
         return instantiationStrategy;
     }
 
-    public void instantiationStrategy( String instantiationStrategy )
+    public void instantiationStrategy( InstanciationStrategy instantiationStrategy )
     {
         this.instantiationStrategy = instantiationStrategy;
     }

maven-plugin-tools-annotations/src/site/apt/index.apt

@@ -39,6 +39,7 @@ import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugins.annotations.DependencyScope;
 import org.apache.maven.plugins.annotations.Component;
 import org.apache.maven.plugins.annotations.Execute;
+import org.apache.maven.plugins.annotations.InstanciationStrategy;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
@@ -53,7 +54,7 @@ import org.apache.maven.plugins.annotations.Parameter;
        configurator = "<roleHint>",
        executionStrategy = "<once-per-session|always>",
        inheritByDefault = <true|false>,
-       instantiationStrategy = "<per-lookup|singleton|keep-alive|poolable>",
+       instantiationStrategy = InstanciationStrategy.<strategy>,
        defaultPhase = "<phaseName>",
        requiresDependencyResolution = DependencyScope.<scope>,
        requiresDependencyCollection = DependencyScope.<scope>, // (since Maven 3.0)