/*
* 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 com.aliyun.odps.mapred.bridge;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import com.aliyun.odps.data.Record;
/**
* @author zhe.oyz
*/
public class NonGroupingRecordIterator implements Iterator<Record> {
private WritableRecord value;
private Object[] prefetch; // Prefetched Objects
private int curIndex = 0;
private List<Object[]> valueList;
public NonGroupingRecordIterator(List<Object[]> curValuelist, WritableRecord value) {
this.valueList = curValuelist;
this.value = value;
}
private void fillKeyValue(Object[] objs) {
value.set(Arrays.copyOf(objs, value.getColumnCount()));
}
@Override
public boolean hasNext() {
if (curIndex < valueList.size()) {
return true;
} else {
return false;
}
}
public boolean reset() {
if (prefetch != null) {
fillKeyValue(prefetch);
return true;
}
return false;
}
@Override
public Record next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
fillKeyValue(valueList.get(curIndex));
curIndex++;
prefetch = null;
return value;
}
@Override
public void remove() {
if (!hasNext()) {
throw new NoSuchElementException();
}
prefetch = null;
}
}