| /* |
| * $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.tiles.el; |
| |
| import java.beans.FeatureDescriptor; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import javax.el.ELContext; |
| import javax.el.ELResolver; |
| |
| import org.apache.tiles.request.Request; |
| |
| /** |
| * Resolves beans in request, session and application scope. |
| * |
| * @version $Rev$ $Date$ |
| * @since 2.2.1 |
| */ |
| public class ScopeELResolver extends ELResolver { |
| |
| /** |
| * The length of the suffix: "Scope". |
| */ |
| private static final int SUFFIX_LENGTH = 5; |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| // only resolve at the root of the context |
| if (base != null) { |
| return null; |
| } |
| |
| return Map.class; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, |
| Object base) { |
| if (base != null) { |
| List<FeatureDescriptor> retValue = Collections.emptyList(); |
| return retValue.iterator(); |
| } |
| |
| List<FeatureDescriptor> list = new ArrayList<FeatureDescriptor>(); |
| |
| Request request = (Request) context |
| .getContext(Request.class); |
| for (String scope : request.getAvailableScopes()) { |
| FeatureDescriptor descriptor = new FeatureDescriptor(); |
| descriptor.setDisplayName(scope + "Scope"); |
| descriptor.setExpert(false); |
| descriptor.setHidden(false); |
| descriptor.setName(scope + "Scope"); |
| descriptor.setPreferred(true); |
| descriptor.setShortDescription(""); |
| descriptor.setValue("type", Map.class); |
| descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE); |
| list.add(descriptor); |
| } |
| |
| return list.iterator(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Class<?> getType(ELContext context, Object base, Object property) { |
| if (base != null || property == null || !(property instanceof String) |
| || !((String) property).endsWith("Scope")) { |
| return null; |
| } |
| |
| return Map.class; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) { |
| if (base != null) { |
| return null; |
| } |
| |
| Object retValue = null; |
| String propertyString = (String) property; |
| if (property instanceof String && propertyString.endsWith("Scope")) { |
| Request request = (Request) context |
| .getContext(Request.class); |
| retValue = request.getContext(propertyString.substring(0, |
| propertyString.length() - SUFFIX_LENGTH)); |
| } |
| |
| if (retValue != null) { |
| context.setPropertyResolved(true); |
| } |
| |
| return retValue; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean isReadOnly(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| return true; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) { |
| // Does nothing for the moment. |
| } |
| } |