001/* 002 * (C) Copyright 2013 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 * Anahide Tchertchian 018 */ 019package org.nuxeo.ecm.platform.actions; 020 021import javax.el.ELContext; 022import javax.el.ELException; 023import javax.el.ExpressionFactory; 024import javax.el.ValueExpression; 025import javax.el.VariableMapper; 026 027import org.apache.commons.lang.StringUtils; 028import org.nuxeo.ecm.core.api.DocumentModel; 029import org.nuxeo.ecm.core.api.NuxeoPrincipal; 030 031/** 032 * Default EL action context 033 * 034 * @since 5.7.3 035 */ 036public class ELActionContext extends AbstractActionContext implements ActionContext { 037 038 private static final long serialVersionUID = 1L; 039 040 protected final ELContext originalContext; 041 042 protected final ExpressionFactory expressionFactory; 043 044 public ELActionContext(ELContext originalContext, ExpressionFactory expressionFactory) { 045 super(); 046 this.originalContext = originalContext; 047 this.expressionFactory = expressionFactory; 048 } 049 050 @Override 051 public boolean checkCondition(String expression) throws ELException { 052 if (StringUtils.isBlank(expression) || (expression != null && StringUtils.isBlank(expression.trim()))) { 053 return false; 054 } 055 String expr = expression.trim(); 056 // compatibility code, as JEXL could resolve that kind of expression: 057 // detect if expression is in brackets #{}, otherwise add it 058 if (!expr.startsWith("#{") && !expr.startsWith("${") 059 // don't confuse error messages in case of simple mistakes in the 060 // expression 061 && !expr.endsWith("}")) { 062 expr = "#{" + expr + "}"; 063 } 064 VariableMapper vm = originalContext.getVariableMapper(); 065 // init default variables 066 ValueExpression documentExpr = expressionFactory.createValueExpression(getCurrentDocument(), 067 DocumentModel.class); 068 ValueExpression userExpr = expressionFactory.createValueExpression(getCurrentPrincipal(), NuxeoPrincipal.class); 069 // add variables originally exposed by the action framework, 070 // do not add aliases currentDocument and currentUser here as they 071 // should already be available in this JSF context 072 vm.setVariable("document", documentExpr); 073 vm.setVariable("principal", userExpr); 074 vm.setVariable("currentDocument", documentExpr); 075 vm.setVariable("currentUser", userExpr); 076 // get custom context from ActionContext 077 for (String key : localVariables.keySet()) { 078 vm.setVariable(key, expressionFactory.createValueExpression(getLocalVariable(key), Object.class)); 079 } 080 081 // evaluate expression 082 ValueExpression ve = expressionFactory.createValueExpression(originalContext, expr, Boolean.class); 083 return Boolean.TRUE.equals(ve.getValue(originalContext)); 084 } 085 086}