| 1 | package org.apache.velocity.runtime.parser.node; |
| 2 | /* |
| 3 | * Copyright 2000-2001,2004 The Apache Software Foundation. |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | import org.apache.velocity.context.InternalContextAdapter; |
| 19 | import org.apache.velocity.util.introspection.Introspector; |
| 20 | |
| 21 | import java.lang.reflect.InvocationTargetException; |
| 22 | import org.apache.velocity.exception.MethodInvocationException; |
| 23 | |
| 24 | import org.apache.velocity.runtime.RuntimeLogger; |
| 25 | |
| 26 | |
| 27 | /** |
| 28 | * Executor that simply tries to execute a get(key) |
| 29 | * operation. This will try to find a get(key) method |
| 30 | * for any type of object, not just objects that |
| 31 | * implement the Map interface as was previously |
| 32 | * the case. |
| 33 | * |
| 34 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
| 35 | * @version $Id: GetExecutor.java,v 1.8.4.1 2004/03/03 23:22:59 geirm Exp $ |
| 36 | */ |
| 37 | public class GetExecutor extends AbstractExecutor |
| 38 | { |
| 39 | /** |
| 40 | * Container to hold the 'key' part of |
| 41 | * get(key). |
| 42 | */ |
| 43 | private Object[] args = new Object[1]; |
| 44 | |
| 45 | /** |
| 46 | * Default constructor. |
| 47 | */ |
| 48 | public GetExecutor(RuntimeLogger r, Introspector ispect, Class c, String key) |
| 49 | throws Exception |
| 50 | { |
| 51 | rlog = r; |
| 52 | args[0] = key; |
| 53 | method = ispect.getMethod(c, "get", args); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Execute method against context. |
| 58 | */ |
| 59 | public Object execute(Object o) |
| 60 | throws IllegalAccessException, InvocationTargetException |
| 61 | { |
| 62 | if (method == null) |
| 63 | return null; |
| 64 | |
| 65 | return method.invoke(o, args); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Execute method against context. |
| 70 | */ |
| 71 | public Object OLDexecute(Object o, InternalContextAdapter context) |
| 72 | throws IllegalAccessException, MethodInvocationException |
| 73 | { |
| 74 | if (method == null) |
| 75 | return null; |
| 76 | |
| 77 | try |
| 78 | { |
| 79 | return method.invoke(o, args); |
| 80 | } |
| 81 | catch(InvocationTargetException ite) |
| 82 | { |
| 83 | /* |
| 84 | * the method we invoked threw an exception. |
| 85 | * package and pass it up |
| 86 | */ |
| 87 | |
| 88 | throw new MethodInvocationException( |
| 89 | "Invocation of method 'get(\"" + args[0] + "\")'" |
| 90 | + " in " + o.getClass() |
| 91 | + " threw exception " |
| 92 | + ite.getTargetException().getClass(), |
| 93 | ite.getTargetException(), "get"); |
| 94 | } |
| 95 | catch(IllegalArgumentException iae) |
| 96 | { |
| 97 | return null; |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | |
| 103 | |
| 104 | |
| 105 | |
| 106 | |
| 107 | |
| 108 | |
| 109 | |