001: package org.apache.velocity.runtime.parser.node;
002:
003: /*
004: * Licensed to the Apache Software Foundation (ASF) under one
005: * or more contributor license agreements. See the NOTICE file
006: * distributed with this work for additional information
007: * regarding copyright ownership. The ASF licenses this file
008: * to you under the Apache License, Version 2.0 (the
009: * "License"); you may not use this file except in compliance
010: * with the License. You may obtain a copy of the License at
011: *
012: * http://www.apache.org/licenses/LICENSE-2.0
013: *
014: * Unless required by applicable law or agreed to in writing,
015: * software distributed under the License is distributed on an
016: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017: * KIND, either express or implied. See the License for the
018: * specific language governing permissions and limitations
019: * under the License.
020: */
021:
022: import java.lang.reflect.InvocationTargetException;
023:
024: import org.apache.velocity.runtime.log.Log;
025: import org.apache.velocity.util.introspection.Introspector;
026:
027: /**
028: * Executor that simply tries to execute a put(key, value)
029: * operation. This will try to find a put(key) method
030: * for any type of object, not just objects that
031: * implement the Map interface as was previously
032: * the case.
033: *
034: * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
035: * @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
036: * @version $Id: PutExecutor.java 463298 2006-10-12 16:10:32Z henning $
037: */
038: public class PutExecutor extends SetExecutor {
039: private final Introspector introspector;
040: private final String property;
041:
042: /**
043: * @param log
044: * @param introspector
045: * @param clazz
046: * @param arg
047: * @param property
048: */
049: public PutExecutor(final Log log, final Introspector introspector,
050: final Class clazz, final Object arg, final String property) {
051: this .log = log;
052: this .introspector = introspector;
053: this .property = property;
054:
055: discover(clazz, arg);
056: }
057:
058: /**
059: * @param clazz
060: * @param arg
061: */
062: protected void discover(final Class clazz, final Object arg) {
063: Object[] params;
064:
065: // If you passed in null as property, we don't use the value
066: // for parameter lookup. Instead we just look for put(Object) without
067: // any parameters.
068: //
069: // In any other case, the following condition will set up an array
070: // for looking up put(String, Object) on the class.
071:
072: if (property == null) {
073: // The passed in arg object is used by the Cache to look up the method.
074: params = new Object[] { arg };
075: } else {
076: params = new Object[] { property, arg };
077: }
078:
079: try {
080: setMethod(introspector.getMethod(clazz, "put", params));
081: }
082: /**
083: * pass through application level runtime exceptions
084: */
085: catch (RuntimeException e) {
086: throw e;
087: } catch (Exception e) {
088: log.error("While looking for put('" + params[0]
089: + "') method:", e);
090: }
091: }
092:
093: /**
094: * @see org.apache.velocity.runtime.parser.node.SetExecutor#execute(java.lang.Object, java.lang.Object)
095: */
096: public Object execute(final Object o, final Object value)
097: throws IllegalAccessException, InvocationTargetException {
098: Object[] params;
099:
100: if (isAlive()) {
101: // If property != null, pass in the name for put(key, value). Else just put(value).
102: if (property == null) {
103: params = new Object[] { value };
104: } else {
105: params = new Object[] { property, value };
106: }
107:
108: return getMethod().invoke(o, params);
109: }
110:
111: return null;
112: }
113: }
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