| /* |
| * 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.lang.reflect.Array; |
| import java.util.Iterator; |
| |
| public class ArrayELResolver extends ELResolver { |
| |
| private final boolean readOnly; |
| |
| public ArrayELResolver() { |
| this.readOnly = false; |
| } |
| |
| public ArrayELResolver(boolean readOnly) { |
| this.readOnly = readOnly; |
| } |
| |
| @Override |
| public Class<?> getType(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base != null && base.getClass().isArray()) { |
| context.setPropertyResolved(base, property); |
| try { |
| int idx = coerce(property); |
| checkBounds(base, idx); |
| } catch (IllegalArgumentException e) { |
| // ignore |
| } |
| return base.getClass().getComponentType(); |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base != null && base.getClass().isArray()) { |
| context.setPropertyResolved(base, property); |
| int idx = coerce(property); |
| if (idx < 0 || idx >= Array.getLength(base)) { |
| return null; |
| } |
| return Array.get(base, idx); |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base != null && base.getClass().isArray()) { |
| context.setPropertyResolved(base, property); |
| |
| if (this.readOnly) { |
| throw new PropertyNotWritableException(Util.message(context, |
| "resolverNotWriteable", base.getClass().getName())); |
| } |
| |
| int idx = coerce(property); |
| checkBounds(base, idx); |
| if (value != null && !Util.isAssignableFrom(value.getClass(), |
| base.getClass().getComponentType())) { |
| throw new ClassCastException(Util.message(context, |
| "objectNotAssignable", value.getClass().getName(), |
| base.getClass().getComponentType().getName())); |
| } |
| Array.set(base, idx, value); |
| } |
| } |
| |
| @Override |
| public boolean isReadOnly(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base != null && base.getClass().isArray()) { |
| context.setPropertyResolved(base, property); |
| try { |
| int idx = coerce(property); |
| checkBounds(base, idx); |
| } catch (IllegalArgumentException e) { |
| // ignore |
| } |
| } |
| |
| return this.readOnly; |
| } |
| |
| @Override |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| return null; |
| } |
| |
| @Override |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| if (base != null && base.getClass().isArray()) { |
| return Integer.class; |
| } |
| return null; |
| } |
| |
| private static final void checkBounds(Object base, int idx) { |
| if (idx < 0 || idx >= Array.getLength(base)) { |
| throw new PropertyNotFoundException( |
| new ArrayIndexOutOfBoundsException(idx).getMessage()); |
| } |
| } |
| |
| private static final 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"); |
| } |
| |
| } |