83 lines
2.3 KiB
Java
83 lines
2.3 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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http://www.apache.org/licenses/LICENSE-2.0
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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.poi.hssf.model;
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import java.util.List;
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import org.apache.poi.hssf.record.Record;
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/**
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* Simplifies iteration over a sequence of <tt>Record</tt> objects.
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*/
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public final class RecordStream {
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private final List<Record> _list;
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private int _nextIndex;
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private int _countRead;
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private final int _endIx;
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/**
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* Creates a RecordStream bounded by startIndex and endIndex
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*/
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public RecordStream(List<Record> inputList, int startIndex, int endIx) {
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_list = inputList;
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_nextIndex = startIndex;
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_endIx = endIx;
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_countRead = 0;
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}
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public RecordStream(List<Record> records, int startIx) {
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this(records, startIx, records.size());
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}
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public boolean hasNext() {
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return _nextIndex < _endIx;
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}
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public Record getNext() {
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if(!hasNext()) {
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throw new RuntimeException("Attempt to read past end of record stream");
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}
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_countRead ++;
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return (Record) _list.get(_nextIndex++);
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}
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/**
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* @return the {@link Class} of the next Record. <code>null</code> if this stream is exhausted.
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*/
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public Class<? extends Record> peekNextClass() {
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if(!hasNext()) {
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return null;
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}
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return _list.get(_nextIndex).getClass();
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}
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/**
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* @return -1 if at end of records
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*/
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public int peekNextSid() {
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if(!hasNext()) {
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return -1;
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}
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return ((Record)_list.get(_nextIndex)).getSid();
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}
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public int getCountRead() {
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return _countRead;
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}
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}
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