| /* ==================================================================== |
| 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.extractor; |
| |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Iterator; |
| |
| import org.apache.poi.hemf.record.HemfHeader; |
| import org.apache.poi.hemf.record.HemfRecord; |
| import org.apache.poi.hemf.record.HemfRecordType; |
| import org.apache.poi.util.Internal; |
| import org.apache.poi.util.LittleEndianInputStream; |
| import org.apache.poi.util.RecordFormatException; |
| |
| /** |
| * Read-only EMF extractor. Lots remain |
| */ |
| @Internal |
| public class HemfExtractor implements Iterable<HemfRecord> { |
| |
| private HemfHeader header; |
| private final LittleEndianInputStream stream; |
| |
| public HemfExtractor(InputStream is) throws IOException { |
| stream = new LittleEndianInputStream(is); |
| header = new HemfHeader(); |
| long recordId = stream.readUInt(); |
| long recordSize = stream.readUInt(); |
| |
| header = new HemfHeader(); |
| header.init(stream, recordId, recordSize-8); |
| } |
| |
| @Override |
| public Iterator<HemfRecord> iterator() { |
| return new HemfRecordIterator(); |
| } |
| |
| public HemfHeader getHeader() { |
| return header; |
| } |
| |
| private class HemfRecordIterator implements Iterator<HemfRecord> { |
| |
| private HemfRecord currentRecord = null; |
| |
| HemfRecordIterator() { |
| //queue the first non-header record |
| currentRecord = _next(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return currentRecord != null; |
| } |
| |
| @Override |
| public HemfRecord next() { |
| HemfRecord toReturn = currentRecord; |
| currentRecord = _next(); |
| return toReturn; |
| } |
| |
| private HemfRecord _next() { |
| if (currentRecord != null && currentRecord.getRecordType().equals(HemfRecordType.eof)) { |
| return null; |
| } |
| long recordId = stream.readUInt(); |
| long recordSize = stream.readUInt(); |
| |
| HemfRecord record = null; |
| HemfRecordType type = HemfRecordType.getById(recordId); |
| if (type == null) { |
| throw new RuntimeException("Undefined record of type:"+recordId); |
| } |
| try { |
| record = type.clazz.newInstance(); |
| } catch (InstantiationException e) { |
| throw new RuntimeException(e); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException(e); |
| } |
| try { |
| record.init(stream, recordId, recordSize-8); |
| } catch (IOException e) { |
| throw new RecordFormatException(e); |
| } |
| |
| return record; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException("Remove not supported"); |
| } |
| |
| } |
| } |