001/* 002 * (C) Copyright 2013 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.binding; 018 019import java.io.Serializable; 020import java.util.Collections; 021import java.util.HashMap; 022import java.util.Map; 023 024import javax.el.ELContext; 025import javax.el.PropertyNotFoundException; 026import javax.el.ValueExpression; 027 028/** 029 * Value expression representing a map of value expressions, to allow resolution, at runtime, of all of the map values. 030 * <p> 031 * Useful to pass resolved widget properties to third party code (typically javascript code) 032 * 033 * @since 5.8 034 */ 035public class MapValueExpression extends ValueExpression { 036 037 private static final long serialVersionUID = 1L; 038 039 protected final Map<String, ValueExpression> map; 040 041 public MapValueExpression(Map<String, ValueExpression> map) { 042 super(); 043 this.map = map == null ? Collections.<String, ValueExpression> emptyMap() : map; 044 } 045 046 @Override 047 public Class<?> getExpectedType() { 048 return Map.class; 049 } 050 051 @Override 052 public Class<?> getType(ELContext arg0) throws PropertyNotFoundException { 053 return Map.class; 054 } 055 056 @Override 057 public Object getValue(ELContext elContext) throws PropertyNotFoundException { 058 Map<String, Serializable> res = new HashMap<String, Serializable>(); 059 if (map != null) { 060 for (Map.Entry<String, ValueExpression> entry : map.entrySet()) { 061 ValueExpression ve = entry.getValue(); 062 if (ve != null) { 063 res.put(entry.getKey(), (Serializable) ve.getValue(elContext)); 064 } else { 065 res.put(entry.getKey(), null); 066 } 067 } 068 } 069 return res; 070 } 071 072 @Override 073 public boolean isReadOnly(ELContext arg0) throws PropertyNotFoundException { 074 return true; 075 } 076 077 @Override 078 public void setValue(ELContext arg0, Object arg1) throws PropertyNotFoundException { 079 // do nothing 080 } 081 082 @Override 083 public String getExpressionString() { 084 return null; 085 } 086 087 @Override 088 public boolean isLiteralText() { 089 return false; 090 } 091 092 @Override 093 public boolean equals(Object obj) { 094 if (this == obj) { 095 return true; 096 } 097 if (!(obj instanceof MapValueExpression)) { 098 return false; 099 } 100 MapValueExpression other = (MapValueExpression) obj; 101 return map.equals(other.map); 102 } 103 104 @Override 105 public int hashCode() { 106 return map.hashCode(); 107 } 108 109}