001/* 002 * (C) Copyright 2014 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-2.1.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 javax.faces.model.SelectItem; 020 021/** 022 * Helper for select items management 023 * 024 * @since 6.0 025 */ 026public abstract class SelectItemFactory { 027 028 protected abstract String getVar(); 029 030 protected abstract SelectItem createSelectItem(); 031 032 public SelectItem createSelectItem(Object value) { 033 SelectItem item = null; 034 Object varValue = saveRequestMapVarValue(); 035 try { 036 putIteratorToRequestParam(value); 037 item = createSelectItem(); 038 removeIteratorFromRequestParam(); 039 } finally { 040 restoreRequestMapVarValue(varValue); 041 } 042 return item; 043 } 044 045 protected void putIteratorToRequestParam(Object object) { 046 String var = getVar(); 047 VariableManager.putVariableToRequestParam(var, object); 048 } 049 050 protected void removeIteratorFromRequestParam() { 051 String var = getVar(); 052 VariableManager.removeVariableFromRequestParam(var); 053 } 054 055 /** 056 * Returns the value exposed in request map for the var name. 057 * <p> 058 * This is useful for restoring this value in the request map. 059 * 060 * @since 5.4.2 061 */ 062 protected final Object saveRequestMapVarValue() { 063 String varName = getVar(); 064 return VariableManager.saveRequestMapVarValue(varName); 065 } 066 067 /** 068 * Restores the given value in the request map for the var name. 069 * 070 * @since 5.4.2 071 */ 072 protected final void restoreRequestMapVarValue(Object value) { 073 VariableManager.restoreRequestMapVarValue(getVar(), value); 074 } 075 076}