| /* |
| * 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.Iterator; |
| |
| public class CompositeELResolver extends ELResolver { |
| |
| private int size; |
| |
| private ELResolver[] resolvers; |
| |
| public CompositeELResolver() { |
| this.size = 0; |
| this.resolvers = new ELResolver[2]; |
| } |
| |
| synchronized public void add(ELResolver elResolver) { |
| if (elResolver == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (this.size >= this.resolvers.length) { |
| ELResolver[] nr = new ELResolver[this.size * 2]; |
| System.arraycopy(this.resolvers, 0, nr, 0, this.size); |
| this.resolvers = nr; |
| } |
| this.resolvers[this.size++] = elResolver; |
| } |
| |
| public Object getValue(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| context.setPropertyResolved(false); |
| int sz; |
| ELResolver[] rslvrs; |
| synchronized (this) { |
| sz = this.size; |
| rslvrs = this.resolvers; |
| } |
| Object result = null; |
| for (int i = 0; i < sz; i++) { |
| result = rslvrs[i].getValue(context, base, property); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) throws NullPointerException, |
| PropertyNotFoundException, PropertyNotWritableException, |
| ELException { |
| context.setPropertyResolved(false); |
| int sz; |
| ELResolver[] rslvrs; |
| synchronized (this) { |
| sz = this.size; |
| rslvrs = this.resolvers; |
| } |
| for (int i = 0; i < sz; i++) { |
| rslvrs[i].setValue(context, base, property, value); |
| if (context.isPropertyResolved()) { |
| return; |
| } |
| } |
| } |
| |
| public boolean isReadOnly(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| context.setPropertyResolved(false); |
| int sz; |
| ELResolver[] rslvrs; |
| synchronized (this) { |
| sz = this.size; |
| rslvrs = this.resolvers; |
| } |
| boolean readOnly = false; |
| for (int i = 0; i < sz; i++) { |
| readOnly = rslvrs[i].isReadOnly(context, base, property); |
| if (context.isPropertyResolved()) { |
| return readOnly; |
| } |
| } |
| return false; |
| } |
| |
| synchronized public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| return new FeatureIterator(context, base, this.resolvers, this.size); |
| } |
| |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| int sz; |
| ELResolver[] rslvrs; |
| synchronized (this) { |
| sz = this.size; |
| rslvrs = this.resolvers; |
| } |
| Class<?> commonType = null, type = null; |
| for (int i = 0; i < sz; i++) { |
| type = rslvrs[i].getCommonPropertyType(context, base); |
| if (type != null |
| && (commonType == null || commonType.isAssignableFrom(type))) { |
| commonType = type; |
| } |
| } |
| return commonType; |
| } |
| |
| public Class<?> getType(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| context.setPropertyResolved(false); |
| int sz; |
| ELResolver[] rslvrs; |
| synchronized (this) { |
| sz = this.size; |
| rslvrs = this.resolvers; |
| } |
| Class<?> type; |
| for (int i = 0; i < sz; i++) { |
| type = rslvrs[i].getType(context, base, property); |
| if (context.isPropertyResolved()) { |
| return type; |
| } |
| } |
| return null; |
| } |
| |
| private final static class FeatureIterator implements Iterator<FeatureDescriptor> { |
| |
| private final ELContext context; |
| |
| private final Object base; |
| |
| private final ELResolver[] resolvers; |
| |
| private final int size; |
| |
| private Iterator itr; |
| |
| private int idx; |
| |
| public FeatureIterator(ELContext context, Object base, |
| ELResolver[] resolvers, int size) { |
| this.context = context; |
| this.base = base; |
| this.resolvers = resolvers; |
| this.size = size; |
| |
| this.idx = 0; |
| this.guaranteeIterator(); |
| } |
| |
| private void guaranteeIterator() { |
| while (this.itr == null && this.idx < this.size) { |
| this.itr = this.resolvers[this.idx].getFeatureDescriptors( |
| this.context, this.base); |
| this.idx++; |
| } |
| } |
| |
| public boolean hasNext() { |
| return this.itr != null; |
| } |
| |
| public FeatureDescriptor next() { |
| Object result = null; |
| if (this.itr != null) { |
| if (this.itr.hasNext()) { |
| result = this.itr.next(); |
| if (!this.itr.hasNext()) { |
| this.itr = null; |
| this.guaranteeIterator(); |
| } |
| } |
| } |
| return (FeatureDescriptor) result; |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| } |