001/* 002 * (C) Copyright 2007 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Nuxeo - initial API and implementation 018 * 019 * $Id: MethodResultTagHandler.java 19474 2007-05-27 10:18:21Z sfermigier $ 020 */ 021 022package org.nuxeo.ecm.platform.ui.web.tag.handler; 023 024import java.io.IOException; 025 026import javax.el.MethodExpression; 027import javax.el.ValueExpression; 028import javax.el.VariableMapper; 029import javax.faces.component.UIComponent; 030import javax.faces.view.facelets.FaceletContext; 031import javax.faces.view.facelets.MetaRuleset; 032import javax.faces.view.facelets.MetaTagHandler; 033import javax.faces.view.facelets.TagAttribute; 034import javax.faces.view.facelets.TagConfig; 035 036import org.nuxeo.ecm.platform.ui.web.binding.MethodValueExpression; 037 038import com.sun.faces.facelets.el.VariableMapperWrapper; 039 040/** 041 * Tag handler that exposes the result of a method binding in the variable map. 042 * 043 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a> 044 * @deprecated since Seam 2.0 handles method results 045 * @see SetTagHandler for caching features using parameter immediate 046 */ 047@Deprecated 048public class MethodResultTagHandler extends MetaTagHandler { 049 050 private static final Class[] DEFAULT_PARAM_TYPES_CLASSES = new Class[0]; 051 052 private final TagAttribute name; 053 054 private final TagAttribute value; 055 056 private final TagAttribute immediate; 057 058 private final TagAttribute paramTypes; 059 060 public MethodResultTagHandler(TagConfig config) { 061 super(config); 062 name = getRequiredAttribute("name"); 063 value = getRequiredAttribute("value"); 064 immediate = getAttribute("immediate"); 065 paramTypes = getAttribute("paramTypes"); 066 } 067 068 private Class[] resolveParamTypes(FaceletContext ctx) { 069 // TODO: implement string parsing ? 070 return DEFAULT_PARAM_TYPES_CLASSES; 071 } 072 073 @Override 074 public void apply(FaceletContext ctx, UIComponent parent) throws IOException { 075 String nameStr = name.getValue(ctx); 076 // resolve given value as a method binding, paramtypes ignored for now 077 Class[] paramTypesClasses = resolveParamTypes(ctx); 078 MethodExpression meth = value.getMethodExpression(ctx, Object.class, paramTypesClasses); 079 Boolean invokeNow = false; 080 if (immediate != null) { 081 invokeNow = immediate.getBoolean(ctx); 082 } 083 ValueExpression ve; 084 if (invokeNow) { 085 Object res = meth.invoke(ctx, paramTypesClasses); 086 ve = ctx.getExpressionFactory().createValueExpression(res, Object.class); 087 } else { 088 ve = new MethodValueExpression(ctx.getFunctionMapper(), ctx.getVariableMapper(), meth, paramTypesClasses); 089 } 090 VariableMapper orig = ctx.getVariableMapper(); 091 VariableMapper vm = new VariableMapperWrapper(orig); 092 ctx.setVariableMapper(vm); 093 vm.setVariable(nameStr, ve); 094 try { 095 nextHandler.apply(ctx, parent); 096 } finally { 097 ctx.setVariableMapper(orig); 098 } 099 } 100 101 @Override 102 @SuppressWarnings("rawtypes") 103 protected MetaRuleset createMetaRuleset(Class type) { 104 return null; 105 } 106 107}