| /* |
| * 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; |
| import java.util.NoSuchElementException; |
| |
| public class CompositeELResolver extends ELResolver { |
| |
| private static final Class<?> SCOPED_ATTRIBUTE_EL_RESOLVER; |
| static { |
| Class<?> clazz = null; |
| try { |
| clazz = |
| Class.forName("javax.servlet.jsp.el.ScopedAttributeELResolver"); |
| } catch (ClassNotFoundException e) { |
| // Ignore. This is expected if using the EL stand-alone |
| } |
| SCOPED_ATTRIBUTE_EL_RESOLVER = clazz; |
| } |
| |
| private int size; |
| |
| private ELResolver[] resolvers; |
| |
| public CompositeELResolver() { |
| this.size = 0; |
| this.resolvers = new ELResolver[8]; |
| } |
| |
| 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; |
| } |
| |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| Object result = null; |
| for (int i = 0; i < sz; i++) { |
| result = this.resolvers[i].getValue(context, base, property); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * @since EL 2.2 |
| */ |
| @Override |
| public Object invoke(ELContext context, Object base, Object method, |
| Class<?>[] paramTypes, Object[] params) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| Object obj; |
| for (int i = 0; i < sz; i++) { |
| obj = this.resolvers[i].invoke(context, base, method, paramTypes, |
| params); |
| if (context.isPropertyResolved()) { |
| return obj; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public Class<?> getType(ELContext context, Object base, Object property) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| Class<?> type; |
| for (int i = 0; i < sz; i++) { |
| type = this.resolvers[i].getType(context, base, property); |
| if (context.isPropertyResolved()) { |
| if (SCOPED_ATTRIBUTE_EL_RESOLVER != null && |
| SCOPED_ATTRIBUTE_EL_RESOLVER.isAssignableFrom( |
| resolvers[i].getClass())) { |
| // Special case since |
| // javax.servlet.jsp.el.ScopedAttributeELResolver will |
| // always return Object.class for type |
| Object value = |
| resolvers[i].getValue(context, base, property); |
| if (value != null) { |
| return value.getClass(); |
| } |
| } |
| return type; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| for (int i = 0; i < sz; i++) { |
| this.resolvers[i].setValue(context, base, property, value); |
| if (context.isPropertyResolved()) { |
| return; |
| } |
| } |
| } |
| |
| @Override |
| public boolean isReadOnly(ELContext context, Object base, Object property) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| boolean readOnly = false; |
| for (int i = 0; i < sz; i++) { |
| readOnly = this.resolvers[i].isReadOnly(context, base, property); |
| if (context.isPropertyResolved()) { |
| return readOnly; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| return new FeatureIterator(context, base, this.resolvers, this.size); |
| } |
| |
| @Override |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| int sz = this.size; |
| Class<?> commonType = null, type = null; |
| for (int i = 0; i < sz; i++) { |
| type = this.resolvers[i].getCommonPropertyType(context, base); |
| if (type != null |
| && (commonType == null || commonType.isAssignableFrom(type))) { |
| commonType = type; |
| } |
| } |
| return commonType; |
| } |
| |
| @Override |
| public Object convertToType(ELContext context, Object obj, Class<?> type) { |
| context.setPropertyResolved(false); |
| int sz = this.size; |
| Object result = null; |
| for (int i = 0; i < sz; i++) { |
| result = this.resolvers[i].convertToType(context, obj, type); |
| if (context.isPropertyResolved()) { |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| private static final class FeatureIterator implements Iterator<FeatureDescriptor> { |
| |
| private final ELContext context; |
| |
| private final Object base; |
| |
| private final ELResolver[] resolvers; |
| |
| private final int size; |
| |
| private Iterator<FeatureDescriptor> itr; |
| |
| private int idx; |
| |
| private FeatureDescriptor next; |
| |
| 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++; |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (this.next != null) |
| return true; |
| if (this.itr != null){ |
| while (this.next == null && itr.hasNext()) { |
| this.next = itr.next(); |
| } |
| } else { |
| return false; |
| } |
| if (this.next == null) { |
| this.itr = null; |
| this.guaranteeIterator(); |
| } |
| return hasNext(); |
| } |
| |
| @Override |
| public FeatureDescriptor next() { |
| if (!hasNext()) |
| throw new NoSuchElementException(); |
| FeatureDescriptor result = this.next; |
| this.next = null; |
| return result; |
| |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| } |