001// Copyright 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry.portlet.bindings; 016 017import java.util.Map; 018 019import javax.portlet.PortletRequest; 020 021import org.apache.hivemind.ApplicationRuntimeException; 022import org.apache.hivemind.Location; 023import org.apache.hivemind.util.Defense; 024import org.apache.tapestry.binding.AbstractBinding; 025import org.apache.tapestry.coerce.ValueConverter; 026 027/** 028 * Allows access to a Portlet user attrbute. 029 * 030 * @author Howard M. Lewis Ship 031 * @since 4.0 032 */ 033public class UserAttributeBinding extends AbstractBinding 034{ 035 private final PortletRequest _request; 036 037 private final String _attributeName; 038 039 public UserAttributeBinding(String description, ValueConverter valueConverter, 040 Location location, PortletRequest request, String attributeName) 041 { 042 super(description, valueConverter, location); 043 044 Defense.notNull(request, "request"); 045 Defense.notNull(attributeName, "attributeName"); 046 047 _request = request; 048 _attributeName = attributeName; 049 } 050 051 public boolean isInvariant() 052 { 053 // These can always be changed. 054 return false; 055 } 056 057 private Map getUserInfo() 058 { 059 Map result = (Map) _request.getAttribute(PortletRequest.USER_INFO); 060 061 if (result == null) 062 throw new ApplicationRuntimeException(BindingsMessages.noUserInfo(), getLocation(), 063 null); 064 065 return result; 066 } 067 068 public Object getObject() 069 { 070 return getUserInfo().get(_attributeName); 071 } 072 073 public void setObject(Object value) 074 { 075 String asString = (String) getValueConverter().coerceValue(value, String.class); 076 077 getUserInfo().put(_attributeName, asString); 078 } 079}