001/* 002 * (C) Copyright 2014 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.ui.web.component; 020 021import javax.faces.model.SelectItem; 022 023/** 024 * Helper for select items management 025 * 026 * @since 6.0 027 */ 028public abstract class SelectItemFactory { 029 030 protected abstract String getVar(); 031 032 protected abstract SelectItem createSelectItem(); 033 034 public SelectItem createSelectItem(Object value) { 035 SelectItem item = null; 036 Object varValue = saveRequestMapVarValue(); 037 try { 038 putIteratorToRequestParam(value); 039 item = createSelectItem(); 040 removeIteratorFromRequestParam(); 041 } finally { 042 restoreRequestMapVarValue(varValue); 043 } 044 return item; 045 } 046 047 protected void putIteratorToRequestParam(Object object) { 048 String var = getVar(); 049 VariableManager.putVariableToRequestParam(var, object); 050 } 051 052 protected void removeIteratorFromRequestParam() { 053 String var = getVar(); 054 VariableManager.removeVariableFromRequestParam(var); 055 } 056 057 /** 058 * Returns the value exposed in request map for the var name. 059 * <p> 060 * This is useful for restoring this value in the request map. 061 * 062 * @since 5.4.2 063 */ 064 protected final Object saveRequestMapVarValue() { 065 String varName = getVar(); 066 return VariableManager.saveRequestMapVarValue(varName); 067 } 068 069 /** 070 * Restores the given value in the request map for the var name. 071 * 072 * @since 5.4.2 073 */ 074 protected final void restoreRequestMapVarValue(Object value) { 075 VariableManager.restoreRequestMapVarValue(getVar(), value); 076 } 077 078}