| /* |
| * 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 org.apache.el.stream; |
| |
| import java.beans.FeatureDescriptor; |
| import java.lang.reflect.Array; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import javax.el.ELContext; |
| import javax.el.ELResolver; |
| |
| public class StreamELResolverImpl extends ELResolver { |
| |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) { |
| return null; |
| } |
| |
| @Override |
| public Class<?> getType(ELContext context, Object base, Object property) { |
| return null; |
| } |
| |
| @Override |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) { |
| // NO-OP |
| } |
| |
| @Override |
| public boolean isReadOnly(ELContext context, Object base, Object property) { |
| return false; |
| } |
| |
| @Override |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, |
| Object base) { |
| return null; |
| } |
| |
| @Override |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| return null; |
| } |
| |
| @Override |
| public Object invoke(ELContext context, Object base, Object method, |
| Class<?>[] paramTypes, Object[] params) { |
| |
| if ("stream".equals(method) && params.length == 0) { |
| if (base.getClass().isArray()) { |
| context.setPropertyResolved(true); |
| return new Stream(new ArrayIterator(base)); |
| } else if (base instanceof Collection) { |
| context.setPropertyResolved(true); |
| @SuppressWarnings("unchecked") |
| Collection<Object> collection = (Collection<Object>) base; |
| return new Stream(collection.iterator()); |
| } |
| } |
| |
| // Not for handling by this resolver |
| return null; |
| } |
| |
| |
| private static class ArrayIterator implements Iterator<Object> { |
| |
| private final Object base; |
| private final int size; |
| private int index = 0; |
| |
| public ArrayIterator(Object base) { |
| this.base = base; |
| size = Array.getLength(base); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return size > index; |
| } |
| |
| @Override |
| public Object next() { |
| return Array.get(base, index++); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |