001/* 002 * (C) Copyright 2006-2015 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 * bstefanescu 018 */ 019package org.nuxeo.connect.update.task.guards; 020 021import java.util.Map; 022 023import org.apache.commons.jexl.Expression; 024import org.apache.commons.jexl.ExpressionFactory; 025import org.apache.commons.jexl.JexlContext; 026import org.apache.commons.jexl.parser.ParseException; 027import org.nuxeo.common.utils.ExceptionUtils; 028 029/** 030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> 031 */ 032public class Guard { 033 034 protected final String value; 035 036 protected Expression expr; 037 038 public Guard(String expr) { 039 value = expr; 040 try { 041 this.expr = ExpressionFactory.createExpression(expr); 042 } catch (ParseException e) { 043 throw new RuntimeException(e); 044 } catch (Exception e) { // stupid JEXL API throws Exception 045 throw ExceptionUtils.runtimeException(e); 046 } 047 } 048 049 public boolean evaluate(final Map<String, Object> map) { 050 map.put("Version", new VersionHelper()); 051 map.put("Platform", new PlatformHelper()); 052 JexlContext ctx = new JexlContext() { 053 @Override 054 @SuppressWarnings("rawtypes") 055 public void setVars(Map arg0) { 056 // do nothing 057 } 058 059 @Override 060 @SuppressWarnings("rawtypes") 061 public Map getVars() { 062 return map; 063 } 064 }; 065 try { 066 return (Boolean) expr.evaluate(ctx); 067 } catch (Exception e) { // stupid JEXL API throws Exception 068 throw ExceptionUtils.runtimeException(e); 069 } 070 } 071 072}