/* ====================================================================
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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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namespace HH.WMS.Utils.NPOI.HSSF.Record.Aggregates
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{
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using System;
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using System.Text;
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using HH.WMS.Utils.NPOI.HSSF.Record;
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public interface RecordVisitor
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{
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/**
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* Implementors may call non-mutating methods on Record r.
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* @param r must not be <c>null</c>
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*/
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void VisitRecord(Record r);
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}
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/**
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* <c>RecordAggregate</c>s are groups of of BIFF <c>Record</c>s that are typically stored
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* together and/or updated together. Workbook / Sheet records are typically stored in a sequential
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* list, which does not provide much structure to coordinate updates.
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*
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* @author Josh Micich
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*/
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[Serializable]
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public abstract class RecordAggregate : RecordBase
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{
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public virtual short Sid
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{
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get
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{
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throw new NotImplementedException("Should not be called");
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}
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}
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// there seams to be nothing to free: public abstract void Dispose();
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/**
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* Visit each of the atomic BIFF records contained in this {@link RecordAggregate} in the order
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* that they should be written to file. Implementors may or may not return the actual
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* {@link Record}s being used to manage POI's internal implementation. Callers should not
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* assume either way, and therefore only attempt to modify those {@link Record}s after cloning
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*/
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public abstract void VisitContainedRecords(RecordVisitor rv);
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public override int Serialize(int offset, byte[] data)
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{
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SerializingRecordVisitor srv = new SerializingRecordVisitor(data, offset);
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VisitContainedRecords(srv);
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return srv.CountBytesWritten();
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}
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public override int RecordSize
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{
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get
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{
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RecordSizingVisitor rsv = new RecordSizingVisitor();
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VisitContainedRecords(rsv);
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return rsv.TotalSize;
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}
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}
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private class SerializingRecordVisitor : RecordVisitor
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{
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private byte[] _data;
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private int _startOffset;
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private int _countBytesWritten;
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public SerializingRecordVisitor(byte[] data, int startOffset)
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{
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_data = data;
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_startOffset = startOffset;
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_countBytesWritten = 0;
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}
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public int CountBytesWritten()
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{
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return _countBytesWritten;
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}
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public void VisitRecord(Record r)
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{
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int currentOffset = _startOffset + _countBytesWritten;
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_countBytesWritten += r.Serialize(currentOffset, _data);
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}
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}
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private class RecordSizingVisitor : RecordVisitor
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{
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private int _totalSize;
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public RecordSizingVisitor()
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{
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_totalSize = 0;
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}
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public int TotalSize
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{
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get
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{
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return _totalSize;
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}
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}
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public void VisitRecord(Record r)
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{
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_totalSize += r.RecordSize;
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}
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}
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public virtual Record CloneViaReserialise()
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{
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throw new NotImplementedException("Please implement it in subclass");
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}
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}
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/**
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* A wrapper for {@link RecordVisitor} which accumulates the sizes of all
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* records visited.
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*/
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public class PositionTrackingVisitor : RecordVisitor
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{
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private RecordVisitor _rv;
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private int _position;
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public PositionTrackingVisitor(RecordVisitor rv, int initialPosition)
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{
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_rv = rv;
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_position = initialPosition;
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}
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public void VisitRecord(Record r)
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{
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_position += r.RecordSize;
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_rv.VisitRecord(r);
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}
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public int Position
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{
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get
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{
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return _position;
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}
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set { _position = value; }
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}
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}
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}
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