added javadoc
git-svn-id: https://svn.apache.org/repos/asf/maven/maven-2/branches/maven-2.2.x@1340265 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java b/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java
index 17b9edd..faf5f99 100644
--- a/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java
+++ b/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java
@@ -35,6 +35,24 @@
import java.util.Properties;
/**
+ * Evaluator for plugin parameters expressions. Content surrounded by <code>${</code> and <code>}</code> is evaluated.
+ * Recognized values are:<ul>
+ * <li><code>localRepository</code></li>
+ * <li><code>session</code></li>
+ * <li><code>reactorProjects</code></li>
+ * <li><code>reports</code></li>
+ * <li><code>mojoExecution</code></li>
+ * <li><code>project</code></li>
+ * <li><code>executedProject</code></li>
+ * <li><code>project.*</code></li>
+ * <li><code>plugin.*</code></li>
+ * <li><code>settings</code></li>
+ * <li><code>settings.*</code></li>
+ * <li><code>basedir</code></li>
+ * <li>system properties</li>
+ * <li>project properties</li>
+ * </ul>
+ *
* @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
* @version $Id$
* @todo belong in MavenSession, so it only gets created once?
