| /* |
| * 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.commons.jexl3.internal.introspection; |
| |
| import java.lang.reflect.Array; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * <p> |
| * An Iterator wrapper for an Object[]. This will |
| * allow us to deal with all array like structures |
| * in a consistent manner. |
| * </p> |
| * <p> |
| * WARNING : this class's operations are NOT synchronized. |
| * It is meant to be used in a single thread, newly created |
| * for each use in the #foreach() directive. |
| * If this is used or shared, synchronize in the |
| * next() method. |
| * </p> |
| * |
| * @since 1.0 |
| */ |
| public class ArrayIterator implements Iterator<Object> { |
| /** The objects to iterate over. */ |
| private final Object array; |
| /** The size of the array. */ |
| private final int size; |
| /** The current position and size in the array. */ |
| private int pos; |
| |
| /** |
| * Creates a new iterator instance for the specified array. |
| * @param arr The array for which an iterator is desired. |
| */ |
| public ArrayIterator(final Object arr) { |
| if (arr == null) { |
| array = null; |
| pos = 0; |
| size = 0; |
| } else if (!arr.getClass().isArray()) { |
| throw new IllegalArgumentException(arr.getClass() + " is not an array"); |
| } else { |
| array = arr; |
| pos = 0; |
| size = Array.getLength(array); |
| } |
| } |
| |
| /** |
| * Move to next element in the array. |
| * |
| * @return The next object in the array. |
| */ |
| @Override |
| public Object next() { |
| if (pos < size) { |
| return Array.get(array, pos++); |
| } |
| // we screwed up... |
| throw new NoSuchElementException("No more elements: " + pos |
| + " / " + size); |
| } |
| |
| /** |
| * Check to see if there is another element in the array. |
| * |
| * @return Whether there is another element. |
| */ |
| @Override |
| public boolean hasNext() { |
| return (pos < size); |
| } |
| |
| /** |
| * No op--merely added to satify the <code>Iterator</code> interface. |
| */ |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |