org.apache.poi.hemf.record.emf.HemfRecordIterator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of poi-scratchpad Show documentation
Show all versions of poi-scratchpad Show documentation
Apache POI - Java API To Access Microsoft Format Files
/* ====================================================================
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.poi.hemf.record.emf;
import java.io.IOException;
import java.util.Iterator;
import org.apache.poi.util.LittleEndianConsts;
import org.apache.poi.util.LittleEndianInputStream;
import org.apache.poi.util.RecordFormatException;
public class HemfRecordIterator implements Iterator {
static final int HEADER_SIZE = 2*LittleEndianConsts.INT_SIZE;
private final LittleEndianInputStream stream;
private HemfRecord currentRecord;
public HemfRecordIterator(LittleEndianInputStream leis) {
stream = leis;
//queue the first non-header record
currentRecord = _next();
}
@Override
public boolean hasNext() {
return currentRecord != null;
}
@Override
public HemfRecord next() {
HemfRecord toReturn = currentRecord;
currentRecord = (currentRecord instanceof HemfMisc.EmfEof) ? null : _next();
return toReturn;
}
private HemfRecord _next() {
if (currentRecord != null && HemfRecordType.eof == currentRecord.getEmfRecordType()) {
return null;
}
final int readIndex = stream.getReadIndex();
final long recordId, recordSize;
try {
recordId = stream.readUInt();
recordSize = stream.readUInt();
} catch (RuntimeException e) {
// EOF
return null;
}
HemfRecordType type = HemfRecordType.getById(recordId);
if (type == null) {
throw new RecordFormatException("Undefined record of type: "+recordId+" at "+Integer.toHexString(readIndex));
}
final HemfRecord record = type.constructor.get();
try {
long remBytes = recordSize - HEADER_SIZE;
long readBytes = record.init(stream, remBytes, recordId);
assert (readBytes <= remBytes);
stream.skipFully((int) (remBytes - readBytes));
} catch (RecordFormatException e) {
throw e;
} catch (IOException|RuntimeException e) {
throw new RecordFormatException(e);
}
return record;
}
@Override
public void remove() {
throw new UnsupportedOperationException("Remove not supported");
}
}