Update implementation of TaskContext to support the new resolveValue method in TaskContext

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270515 13f79535-47bb-0310-9956-ffa450edef68

proposal/myrmidon/src/java/org/apache/myrmidon/components/workspace/DefaultTaskContext.java

@@ -12,6 +12,8 @@ import java.util.Map;
 import org.apache.avalon.excalibur.i18n.ResourceManager;
 import org.apache.avalon.excalibur.i18n.Resources;
 import org.apache.avalon.excalibur.io.FileUtil;
+import org.apache.avalon.excalibur.property.PropertyException;
+import org.apache.avalon.excalibur.property.PropertyUtil;
 import org.apache.avalon.framework.context.ContextException;
 import org.apache.avalon.framework.context.DefaultContext;
 import org.apache.myrmidon.api.TaskContext;
@@ -104,6 +106,38 @@ public class DefaultTaskContext
         return FileUtil.resolveFile( getBaseDirectory(), filename );
     }
 
+    /**
+     * Resolve a value according to the context.
+     * This involves evaluating the string and thus removing
+     * ${} sequences according to the rules specified at
+     * ............
+     *
+     * @param value the value to resolve
+     * @return the resolved value
+     */
+    public Object resolveValue( final String value )
+        throws TaskException
+    {
+        try
+        {
+            final Object object =
+                PropertyUtil.resolveProperty( value, this, false );
+
+            if( null == object )
+            {
+                final String message = REZ.getString( "null-resolved-value.error", value );
+                throw new TaskException( message );
+            }
+
+            return object;
+        }
+        catch( final PropertyException pe )
+        {
+            final String message = REZ.getString( "bad-resolve.error", value );
+            throw new TaskException( message, pe );
+        }
+    }
+
     /**
      * Retrieve property for name.
      *

proposal/myrmidon/src/java/org/apache/myrmidon/components/workspace/Resources.properties

@@ -17,3 +17,5 @@ no-dir.error=No Base Directory in Context.
 no-parent.error=Can't set a property with parent scope when context has no parent.
 bad-scope.error=Unknown property scope! ({0}).
 bad-property.error=Property {0} must have a value of type {1}.
+null-resolved-value.error=Value "{0}" resolved to null.
+bad-resolve.error=Unable to resolve value "{0}".