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- /* ====================================================================
- 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.hssf.eventmodel;
-
- import java.io.InputStream;
- import java.util.Arrays;
-
- import org.apache.poi.hssf.record.ContinueRecord;
- import org.apache.poi.hssf.record.Record;
- import org.apache.poi.hssf.record.RecordFactory;
- import org.apache.poi.hssf.record.RecordInputStream;
- import org.apache.poi.util.RecordFormatException;
-
- /**
- * Event-based record factory. As opposed to RecordFactory
- * this version sends {@link ERFListener#processRecord(org.apache.poi.hssf.record.Record) } messages to
- * the supplied listener. Record notifications are sent one record behind
- * to ensure that {@link ContinueRecord}s are processed first.
- */
- public final class EventRecordFactory {
-
- private final ERFListener _listener;
- private final short[] _sids;
-
- /**
- * Create an EventRecordFactory
- *
- * @param listener the listener to be informed about events
- * @param sids an array of Record.sid values identifying the records
- * the listener will work with. Alternatively if this is "null" then
- * all records are passed. For all 'known' record types use {@link RecordFactory#getAllKnownRecordSIDs()}
- */
- public EventRecordFactory(ERFListener listener, short[] sids) {
- _listener = listener;
- if (sids == null) {
- _sids = null;
- } else {
- _sids = sids.clone();
- Arrays.sort(_sids); // for faster binary search
- }
- }
- private boolean isSidIncluded(short sid) {
- if (_sids == null) {
- return true;
- }
- return Arrays.binarySearch(_sids, sid) >= 0;
- }
-
-
- /**
- * sends the record event to all registered listeners.
- * @param record the record to be thrown.
- * @return <code>false</code> to abort. This aborts
- * out of the event loop should the listener return false
- */
- private boolean processRecord(org.apache.poi.hssf.record.Record record) {
- if (!isSidIncluded(record.getSid())) {
- return true;
- }
- return _listener.processRecord(record);
- }
-
- /**
- * Create an array of records from an input stream
- *
- * @param in the InputStream from which the records will be
- * obtained
- *
- * @throws RecordFormatException on error processing the
- * InputStream
- */
- public void processRecords(InputStream in) throws RecordFormatException {
- Record last_record = null;
-
- RecordInputStream recStream = new RecordInputStream(in);
-
- while (recStream.hasNextRecord()) {
- recStream.nextRecord();
- Record[] recs = RecordFactory.createRecord(recStream); // handle MulRK records
- if (recs.length > 1) {
- for (org.apache.poi.hssf.record.Record rec : recs) {
- if ( last_record != null ) {
- if (!processRecord(last_record)) {
- return;
- }
- }
- last_record = rec; // do to keep the algorithm homogeneous...you can't
- } // actually continue a number record anyhow.
- } else {
- Record record = recs[ 0 ];
-
- if (record != null) {
- if (last_record != null) {
- if (!processRecord(last_record)) {
- return;
- }
- }
- last_record = record;
- }
- }
- }
-
- if (last_record != null) {
- processRecord(last_record);
- }
- }
- }
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