org.apache.commons.jexl.util.MapGetExecutor Maven / Gradle / Ivy
/*
* 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 Henning P. Schmiedehausen
* @version $Id$
*/
public class MapGetExecutor extends AbstractExecutor {
private final String property;
public MapGetExecutor(final Log rlog, final Class clazz, final String property) {
this.rlog = rlog;
this.property = property;
discover(clazz);
}
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;
}
}
}
public Object execute(final Object o) {
return ((Map) o).get(property);
}
}