001/* 002 * (C) Copyright 2011 Nuxeo SA (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * Contributors: 015 * Anahide Tchertchian 016 */ 017package org.nuxeo.ecm.platform.ui.web.component; 018 019import java.util.Map; 020 021import javax.faces.context.FacesContext; 022 023/** 024 * Helper class with static methods to remove/add variables to the request during a component rendering. 025 * 026 * @since 5.5 027 */ 028public class VariableManager { 029 030 /** 031 * Returns the value exposed in request map for the var name. 032 * <p> 033 * This is useful for restoring this value in the request map. 034 */ 035 public static final Object saveRequestMapVarValue(String var) { 036 if (var != null) { 037 FacesContext context = FacesContext.getCurrentInstance(); 038 Map<String, Object> requestMap = context.getExternalContext().getRequestMap(); 039 if (requestMap.containsKey(var)) { 040 return requestMap.get(var); 041 } 042 } 043 return null; 044 } 045 046 /** 047 * Restores the given value in the request map for the var name. 048 */ 049 public static final void restoreRequestMapVarValue(String var, Object value) { 050 if (var != null) { 051 FacesContext context = FacesContext.getCurrentInstance(); 052 Map<String, Object> requestMap = context.getExternalContext().getRequestMap(); 053 if (value == null) { 054 requestMap.remove(var); 055 } else { 056 requestMap.put(var, value); 057 } 058 } 059 } 060 061 public static final void putVariableToRequestParam(String var, Object object) { 062 if (var != null) { 063 FacesContext.getCurrentInstance().getExternalContext().getRequestMap().put(var, object); 064 } 065 } 066 067 public static final void removeVariableFromRequestParam(String var) { 068 if (var != null) { 069 FacesContext.getCurrentInstance().getExternalContext().getRequestMap().remove(var); 070 } 071 } 072 073}