ArrayListBackedIterator.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.hadoop.contrib.utils.join;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Iterator;
- /**
- * This class provides an implementation of ResetableIterator. The
- * implementation will be based on ArrayList.
- *
- *
- */
- public class ArrayListBackedIterator implements ResetableIterator {
- private Iterator iter;
- private ArrayList<Object> data;
- public ArrayListBackedIterator() {
- this(new ArrayList<Object>());
- }
- public ArrayListBackedIterator(ArrayList<Object> data) {
- this.data = data;
- this.iter = this.data.iterator();
- }
- public void add(Object item) {
- this.data.add(item);
- }
- public boolean hasNext() {
- return this.iter.hasNext();
- }
- public Object next() {
- return this.iter.next();
- }
- public void remove() {
- }
- public void reset() {
- this.iter = this.data.iterator();
- }
- public void close() throws IOException {
- this.iter = null;
- this.data = null;
- }
- }