| /* |
| * 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 javax.el; |
| |
| import java.beans.FeatureDescriptor; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class MapELResolver extends ELResolver { |
| |
| private final static Class UNMODIFIABLE = Collections.unmodifiableMap( |
| new HashMap()).getClass(); |
| |
| private final boolean readOnly; |
| |
| public MapELResolver() { |
| this.readOnly = false; |
| } |
| |
| public MapELResolver(boolean readOnly) { |
| this.readOnly = readOnly; |
| } |
| |
| public Object getValue(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof Map) { |
| context.setPropertyResolved(true); |
| return ((Map) base).get(property); |
| } |
| |
| return null; |
| } |
| |
| public Class<?> getType(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof Map) { |
| context.setPropertyResolved(true); |
| Object obj = ((Map) base).get(property); |
| return (obj != null) ? obj.getClass() : null; |
| } |
| |
| return null; |
| } |
| |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) throws NullPointerException, |
| PropertyNotFoundException, PropertyNotWritableException, |
| ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof Map) { |
| context.setPropertyResolved(true); |
| |
| if (this.readOnly) { |
| throw new PropertyNotWritableException(message(context, |
| "resolverNotWriteable", new Object[] { base.getClass() |
| .getName() })); |
| } |
| |
| try { |
| ((Map) base).put(property, value); |
| } catch (UnsupportedOperationException e) { |
| throw new PropertyNotWritableException(e); |
| } |
| } |
| } |
| |
| public boolean isReadOnly(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof Map) { |
| context.setPropertyResolved(true); |
| return this.readOnly || UNMODIFIABLE.equals(base.getClass()); |
| } |
| |
| return this.readOnly; |
| } |
| |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| if (base instanceof Map) { |
| Iterator itr = ((Map) base).keySet().iterator(); |
| List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>(); |
| Object key; |
| FeatureDescriptor desc; |
| while (itr.hasNext()) { |
| key = itr.next(); |
| desc = new FeatureDescriptor(); |
| desc.setDisplayName(key.toString()); |
| desc.setExpert(false); |
| desc.setHidden(false); |
| desc.setName(key.toString()); |
| desc.setPreferred(true); |
| desc.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.FALSE); |
| desc.setValue(TYPE, key.getClass()); |
| feats.add(desc); |
| } |
| return feats.iterator(); |
| } |
| return null; |
| } |
| |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| if (base instanceof Map) { |
| return Object.class; |
| } |
| return null; |
| } |
| |
| } |