| 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.util.introspection.Introspector; |
| 19 | |
| 20 | import org.apache.velocity.runtime.RuntimeLogger; |
| 21 | |
| 22 | /** |
| 23 | * Handles discovery and valuation of a |
| 24 | * boolean object property, of the |
| 25 | * form public boolean is<property> when executed. |
| 26 | * |
| 27 | * We do this separately as to preserve the current |
| 28 | * quasi-broken semantics of get<as is property> |
| 29 | * get< flip 1st char> get("property") and now followed |
| 30 | * by is<Property> |
| 31 | * |
| 32 | * @author <a href="geirm@apache.org">Geir Magnusson Jr.</a> |
| 33 | * @version $Id: BooleanPropertyExecutor.java,v 1.3.4.1 2004/03/03 23:22:59 geirm Exp $ |
| 34 | */ |
| 35 | public class BooleanPropertyExecutor extends PropertyExecutor |
| 36 | { |
| 37 | public BooleanPropertyExecutor(RuntimeLogger rlog, Introspector is, Class clazz, String property) |
| 38 | { |
| 39 | super(rlog, is, clazz, property); |
| 40 | } |
| 41 | |
| 42 | protected void discover(Class clazz, String property) |
| 43 | { |
| 44 | try |
| 45 | { |
| 46 | char c; |
| 47 | StringBuffer sb; |
| 48 | |
| 49 | Object[] params = { }; |
| 50 | |
| 51 | /* |
| 52 | * now look for a boolean isFoo |
| 53 | */ |
| 54 | |
| 55 | sb = new StringBuffer("is"); |
| 56 | sb.append(property); |
| 57 | |
| 58 | c = sb.charAt(2); |
| 59 | |
| 60 | if (Character.isLowerCase(c)) |
| 61 | { |
| 62 | sb.setCharAt(2, Character.toUpperCase(c)); |
| 63 | } |
| 64 | |
| 65 | methodUsed = sb.toString(); |
| 66 | method = introspector.getMethod(clazz, methodUsed, params); |
| 67 | |
| 68 | if (method != null) |
| 69 | { |
| 70 | /* |
| 71 | * now, this has to return a boolean |
| 72 | */ |
| 73 | |
| 74 | if (method.getReturnType() == Boolean.TYPE) |
| 75 | return; |
| 76 | |
| 77 | method = null; |
| 78 | } |
| 79 | } |
| 80 | catch(Exception e) |
| 81 | { |
| 82 | rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e); |
| 83 | } |
| 84 | } |
| 85 | } |