| /* |
| * 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.Arrays; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public class ListELResolver extends ELResolver { |
| |
| private final boolean readOnly; |
| |
| private final static Class UNMODIFIABLE = Collections.unmodifiableList( |
| new ArrayList()).getClass(); |
| |
| public ListELResolver() { |
| this.readOnly = false; |
| } |
| |
| public ListELResolver(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 List) { |
| context.setPropertyResolved(true); |
| List list = (List) base; |
| int idx = coerce(property); |
| if (idx < 0 || idx >= list.size()) { |
| return null; |
| } |
| return list.get(idx); |
| } |
| |
| return null; |
| } |
| |
| public Class<?> getType(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof List) { |
| context.setPropertyResolved(true); |
| List list = (List) base; |
| int idx = coerce(property); |
| if (idx < 0 || idx >= list.size()) { |
| return null; |
| } |
| Object obj = list.get(idx); |
| 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 List) { |
| context.setPropertyResolved(true); |
| List list = (List) base; |
| |
| if (this.readOnly) { |
| throw new PropertyNotWritableException(message(context, |
| "resolverNotWriteable", new Object[] { base.getClass() |
| .getName() })); |
| } |
| |
| int idx = coerce(property); |
| try { |
| list.set(idx, value); |
| } catch (UnsupportedOperationException e) { |
| throw new PropertyNotWritableException(e); |
| } catch (IndexOutOfBoundsException e) { |
| throw new PropertyNotFoundException(e); |
| } |
| } |
| } |
| |
| public boolean isReadOnly(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof List) { |
| context.setPropertyResolved(true); |
| List list = (List) base; |
| int idx = coerce(property); |
| if (idx < 0 || idx >= list.size()) { |
| throw new PropertyNotFoundException( |
| new ArrayIndexOutOfBoundsException(idx).getMessage()); |
| } |
| return this.readOnly || UNMODIFIABLE.equals(list.getClass()); |
| } |
| |
| return this.readOnly; |
| } |
| |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| if (base instanceof List) { |
| FeatureDescriptor[] descs = new FeatureDescriptor[((List) base).size()]; |
| for (int i = 0; i < descs.length; i++) { |
| descs[i] = new FeatureDescriptor(); |
| descs[i].setDisplayName("["+i+"]"); |
| descs[i].setExpert(false); |
| descs[i].setHidden(false); |
| descs[i].setName(""+i); |
| descs[i].setPreferred(true); |
| descs[i].setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.FALSE); |
| descs[i].setValue(TYPE, Integer.class); |
| } |
| return Arrays.asList(descs).iterator(); |
| } |
| return null; |
| } |
| |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| if (base != null && base instanceof List) { |
| return Integer.class; |
| } |
| return null; |
| } |
| |
| private final static int coerce(Object property) { |
| if (property instanceof Number) { |
| return ((Number) property).intValue(); |
| } |
| if (property instanceof Character) { |
| return ((Character) property).charValue(); |
| } |
| if (property instanceof Boolean) { |
| return (((Boolean) property).booleanValue() ? 1 : 0); |
| } |
| if (property instanceof String) { |
| return Integer.parseInt((String) property); |
| } |
| throw new IllegalArgumentException(property != null ? property |
| .toString() : "null"); |
| } |
| } |