114 lines
3.3 KiB
Java
114 lines
3.3 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.el.stream;
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import java.beans.FeatureDescriptor;
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import java.lang.reflect.Array;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import javax.el.ELContext;
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import javax.el.ELResolver;
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public class StreamELResolverImpl extends ELResolver {
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@Override
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public Object getValue(ELContext context, Object base, Object property) {
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return null;
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}
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@Override
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public Class<?> getType(ELContext context, Object base, Object property) {
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return null;
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}
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@Override
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public void setValue(ELContext context, Object base, Object property,
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Object value) {
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// NO-OP
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}
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@Override
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public boolean isReadOnly(ELContext context, Object base, Object property) {
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return false;
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}
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@Override
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public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
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Object base) {
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return null;
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}
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@Override
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public Class<?> getCommonPropertyType(ELContext context, Object base) {
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return null;
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}
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@Override
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public Object invoke(ELContext context, Object base, Object method,
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Class<?>[] paramTypes, Object[] params) {
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if ("stream".equals(method) && params.length == 0) {
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if (base.getClass().isArray()) {
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context.setPropertyResolved(true);
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return new Stream(new ArrayIterator(base));
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} else if (base instanceof Collection) {
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context.setPropertyResolved(true);
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@SuppressWarnings("unchecked")
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Collection<Object> collection = (Collection<Object>) base;
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return new Stream(collection.iterator());
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}
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}
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// Not for handling by this resolver
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return null;
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}
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private static class ArrayIterator implements Iterator<Object> {
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private final Object base;
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private final int size;
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private int index = 0;
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public ArrayIterator(Object base) {
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this.base = base;
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size = Array.getLength(base);
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}
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@Override
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public boolean hasNext() {
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return size > index;
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}
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@Override
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public Object next() {
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try {
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return Array.get(base, index++);
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} catch (ArrayIndexOutOfBoundsException e) {
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throw new NoSuchElementException();
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}
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}
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@Override
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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}
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