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From d...@apache.org
Subject svn commit: r589289 - /commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java
Date Sun, 28 Oct 2007 08:07:10 GMT
Author: dion
Date: Sun Oct 28 01:07:09 2007
New Revision: 589289

URL: http://svn.apache.org/viewvc?rev=589289&view=rev
Log:
JEXL-25 bring across code from Peters update

Added:
    commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java

Added: commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java
URL: http://svn.apache.org/viewvc/commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java?rev=589289&view=auto
==============================================================================
--- commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java
(added)
+++ commons/proper/jexl/branches/2.0/src/java/org/apache/commons/jexl/util/MapGetExecutor.java
Sun Oct 28 01:07:09 2007
@@ -0,0 +1,81 @@
+/*
+ * 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.commons.jexl.util;
+
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+
+
+/**
+ * GetExecutor that is smart about Maps. If it detects one, it does not
+ * use Reflection but a cast to access the getter.
+ *
+ * @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
+ * @version $Id$
+ */
+public class MapGetExecutor extends AbstractExecutor {
+    /** the property to get. */
+    private final String property;
+
+    /**
+     * Create the instance.
+     * @param rlog the logger.
+     * @param clazz the class to execute the get on.
+     * @param aProperty the property or key to get.
+     */
+    public MapGetExecutor(final Log rlog, final Class clazz, final String aProperty) {
+        this.rlog = rlog;
+        this.property = aProperty;
+        discover(clazz);
+    }
+
+    /**
+     * Discover the method to call.
+     * @param clazz the class to find the method on.
+     */
+    protected void discover(final Class clazz) {
+        Class[] interfaces = clazz.getInterfaces();
+        for (int i = 0; i < interfaces.length; i++) {
+            if (interfaces[i].equals(Map.class)) {
+                try {
+                    if (property != null) {
+                        method = Map.class.getMethod("get", new Class[]{Object.class});
+                    }
+                    /**
+                     * pass through application level runtime exceptions
+                     */
+                } catch (RuntimeException e) {
+                    throw e;
+                } catch (Exception e) {
+                    rlog.error("While looking for get('" + property + "') method:", e);
+                }
+                break;
+            }
+        }
+    }
+
+    /** 
+     * Get the property from the map.
+     * @param o the map.
+     * @return o.get(property)
+     */
+    public Object execute(final Object o) {
+        return ((Map) o).get(property);
+    }
+}



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