| /* ==================================================================== |
| 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 java.util.NoSuchElementException; |
| |
| import org.apache.poi.util.LittleEndianConsts; |
| import org.apache.poi.util.LittleEndianInputStream; |
| import org.apache.poi.util.RecordFormatException; |
| |
| public class HemfRecordIterator implements Iterator<HemfRecord> { |
| |
| 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() { |
| if (!hasNext()) { |
| throw new NoSuchElementException(); |
| } |
| 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); |
| if (readBytes > remBytes) { |
| throw new RecordFormatException("Record limit exceeded - readBytes: "+readBytes+" / remBytes: "+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"); |
| } |
| |
| } |