poi/src/java/org/apache/poi/hssf/record/RecordFactory.java

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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.hssf.record;

import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.*;

import org.apache.poi.hssf.record.chart.*;
import org.apache.poi.hssf.record.pivottable.*;

/**
 * Title:  Record Factory<P>
 * Description:  Takes a stream and outputs an array of Record objects.<P>
 *
 * @see org.apache.poi.hssf.eventmodel.EventRecordFactory
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @author Marc Johnson (mjohnson at apache dot org)
 * @author Glen Stampoultzis (glens at apache.org)
 * @author Csaba Nagy (ncsaba at yahoo dot com)
 */
public final class RecordFactory {
	private static final int NUM_RECORDS = 512;

	private interface I_RecordCreator {
		Record create(RecordInputStream in);

		Class<? extends Record> getRecordClass();
	}
	private static final class ReflectionRecordCreator implements I_RecordCreator {

		private final Constructor<? extends Record> _c;
		public ReflectionRecordCreator(Constructor<? extends Record> c) {
			_c = c;
		}
		public Record create(RecordInputStream in) {
			Object[] args = { in, };
			try {
				return _c.newInstance(args);
			} catch (IllegalArgumentException e) {
				throw new RuntimeException(e);
			} catch (InstantiationException e) {
				throw new RuntimeException(e);
			} catch (IllegalAccessException e) {
				throw new RuntimeException(e);
			} catch (InvocationTargetException e) {
				throw new RecordFormatException("Unable to construct record instance" , e.getTargetException());
			}
		}
		public Class<? extends Record> getRecordClass() {
			return _c.getDeclaringClass();
		}
	}


	private static final Class<?>[] CONSTRUCTOR_ARGS = { RecordInputStream.class, };

	/**
	 * contains the classes for all the records we want to parse.<br/>
	 * Note - this most but not *every* subclass of Record.
	 */
	@SuppressWarnings("unchecked")
	private static final Class<? extends Record>[] recordClasses = new Class[] {
		ArrayRecord.class,
		BackupRecord.class,
		BlankRecord.class,
		BOFRecord.class,
		BookBoolRecord.class,
		BoolErrRecord.class,
		BottomMarginRecord.class,
		BoundSheetRecord.class,
		CalcCountRecord.class,
		CalcModeRecord.class,
		CFHeaderRecord.class,
		CFRuleRecord.class,
		ChartRecord.class,
		ChartTitleFormatRecord.class,
		CodepageRecord.class,
		ColumnInfoRecord.class,
		ContinueRecord.class,
		CountryRecord.class,
		CRNCountRecord.class,
		CRNRecord.class,
		DateWindow1904Record.class,
		DBCellRecord.class,
		DefaultColWidthRecord.class,
		DefaultRowHeightRecord.class,
		DeltaRecord.class,
		DimensionsRecord.class,
		DrawingGroupRecord.class,
		DrawingRecord.class,
		DrawingSelectionRecord.class,
		DSFRecord.class,
		DVALRecord.class,
		DVRecord.class,
		EOFRecord.class,
		ExtendedFormatRecord.class,
		ExternalNameRecord.class,
		ExternSheetRecord.class,
		ExtSSTRecord.class,
		FilePassRecord.class,
		FileSharingRecord.class,
		FnGroupCountRecord.class,
		FontRecord.class,
		FooterRecord.class,
		FormatRecord.class,
		FormulaRecord.class,
		GridsetRecord.class,
		GutsRecord.class,
		HCenterRecord.class,
		HeaderRecord.class,
		HideObjRecord.class,
		HorizontalPageBreakRecord.class,
		HyperlinkRecord.class,
		IndexRecord.class,
		InterfaceEndRecord.class,
		InterfaceHdrRecord.class,
		IterationRecord.class,
		LabelRecord.class,
		LabelSSTRecord.class,
		LeftMarginRecord.class,
		LegendRecord.class,
		MergeCellsRecord.class,
		MMSRecord.class,
		MulBlankRecord.class,
		MulRKRecord.class,
		NameRecord.class,
		NoteRecord.class,
		NumberRecord.class,
		ObjectProtectRecord.class,
		ObjRecord.class,
		PaletteRecord.class,
		PaneRecord.class,
		PasswordRecord.class,
		PasswordRev4Record.class,
		PrecisionRecord.class,
		PrintGridlinesRecord.class,
		PrintHeadersRecord.class,
		PrintSetupRecord.class,
		ProtectionRev4Record.class,
		ProtectRecord.class,
		RecalcIdRecord.class,
		RefModeRecord.class,
		RefreshAllRecord.class,
		RightMarginRecord.class,
		RKRecord.class,
		RowRecord.class,
		SaveRecalcRecord.class,
		ScenarioProtectRecord.class,
		SelectionRecord.class,
		SeriesRecord.class,
		SeriesTextRecord.class,
		SharedFormulaRecord.class,
		SSTRecord.class,
		StringRecord.class,
		StyleRecord.class,
		SupBookRecord.class,
		TabIdRecord.class,
		TableRecord.class,
		TableStylesRecord.class,
		TextObjectRecord.class,
		TopMarginRecord.class,
		UncalcedRecord.class,
		UseSelFSRecord.class,
		VCenterRecord.class,
		VerticalPageBreakRecord.class,
		WindowOneRecord.class,
		WindowProtectRecord.class,
		WindowTwoRecord.class,
		WriteAccessRecord.class,
		WriteProtectRecord.class,
		WSBoolRecord.class,

		// chart records
		BeginRecord.class,
		ChartFRTInfoRecord.class,
		ChartStartBlockRecord.class,
		ChartEndBlockRecord.class,
// TODO ChartFormatRecord.class,
		ChartStartObjectRecord.class,
		ChartEndObjectRecord.class,
		CatLabRecord.class,
		EndRecord.class,
		LinkedDataRecord.class,
		SeriesToChartGroupRecord.class,

		// pivot table records
		DataItemRecord.class,
		ExtendedPivotTableViewFieldsRecord.class,
		PageItemRecord.class,
		StreamIDRecord.class,
		ViewDefinitionRecord.class,
		ViewFieldsRecord.class,
		ViewSourceRecord.class,
	};

	/**
	 * cache of the recordsToMap();
	 */
	private static final Map<Integer, I_RecordCreator> _recordCreatorsById  = recordsToMap(recordClasses);

	private static short[] _allKnownRecordSIDs;

	/**
	 * Debug / diagnosis method<br/>
	 * Gets the POI implementation class for a given <tt>sid</tt>.  Only a subset of the any BIFF
	 * records are actually interpreted by POI.  A few others are known but not interpreted
	 * (see {@link UnknownRecord#getBiffName(int)}).
	 * @return the POI implementation class for the specified record <tt>sid</tt>.
	 * <code>null</code> if the specified record is not interpreted by POI.
	 */
	public static Class<? extends Record> getRecordClass(int sid) {
		I_RecordCreator rc = _recordCreatorsById.get(Integer.valueOf(sid));
		if (rc == null) {
			return null;
		}
		return rc.getRecordClass();
	}
	/**
	 * create a record, if there are MUL records than multiple records
	 * are returned digested into the non-mul form.
	 */
	public static Record [] createRecord(RecordInputStream in) {

		Record record = createSingleRecord(in);
		if (record instanceof DBCellRecord) {
			// Not needed by POI.  Regenerated from scratch by POI when spreadsheet is written
			return new Record[] { null, };
		}
		if (record instanceof RKRecord) {
			return new Record[] { convertToNumberRecord((RKRecord) record), };
		}
		if (record instanceof MulRKRecord) {
			return convertRKRecords((MulRKRecord)record);
		}
		return new Record[] { record, };
	}

	public static Record createSingleRecord(RecordInputStream in) {
		I_RecordCreator constructor = _recordCreatorsById.get(Integer.valueOf(in.getSid()));

		if (constructor == null) {
			return new UnknownRecord(in);
		}

		return constructor.create(in);
	}

	/**
	 * RK record is a slightly smaller alternative to NumberRecord
	 * POI likes NumberRecord better
	 */
	public static NumberRecord convertToNumberRecord(RKRecord rk) {
		NumberRecord num = new NumberRecord();

		num.setColumn(rk.getColumn());
		num.setRow(rk.getRow());
		num.setXFIndex(rk.getXFIndex());
		num.setValue(rk.getRKNumber());
		return num;
	}

	/**
	 * Converts a {@link MulRKRecord} into an equivalent array of {@link NumberRecord}s
	 */
	public static NumberRecord[] convertRKRecords(MulRKRecord mrk) {
		NumberRecord[] mulRecs = new NumberRecord[mrk.getNumColumns()];
		for (int k = 0; k < mrk.getNumColumns(); k++) {
			NumberRecord nr = new NumberRecord();

			nr.setColumn((short) (k + mrk.getFirstColumn()));
			nr.setRow(mrk.getRow());
			nr.setXFIndex(mrk.getXFAt(k));
			nr.setValue(mrk.getRKNumberAt(k));
			mulRecs[k] = nr;
		}
		return mulRecs;
	}

	/**
	 * Converts a {@link MulBlankRecord} into an equivalent array of {@link BlankRecord}s
	 */
	public static BlankRecord[] convertBlankRecords(MulBlankRecord mbk) {
		BlankRecord[] mulRecs = new BlankRecord[mbk.getNumColumns()];
		for (int k = 0; k < mbk.getNumColumns(); k++) {
			BlankRecord br = new BlankRecord();

			br.setColumn((short) (k + mbk.getFirstColumn()));
			br.setRow(mbk.getRow());
			br.setXFIndex(mbk.getXFAt(k));
			mulRecs[k] = br;
		}
		return mulRecs;
	}

	/**
	 * @return an array of all the SIDS for all known records
	 */
	public static short[] getAllKnownRecordSIDs() {
		if (_allKnownRecordSIDs == null) {
			short[] results = new short[ _recordCreatorsById.size() ];
			int i = 0;

			for (Iterator<Integer> iterator = _recordCreatorsById.keySet().iterator(); iterator.hasNext(); ) {
				Integer sid = iterator.next();

				results[i++] = sid.shortValue();
			}
			Arrays.sort(results);
 			_allKnownRecordSIDs = results;
		}

		return _allKnownRecordSIDs.clone();
	}

	/**
	 * gets the record constructors and sticks them in the map by SID
	 * @return map of SIDs to short,short,byte[] constructors for Record classes
	 * most of org.apache.poi.hssf.record.*
	 */
	private static Map<Integer, I_RecordCreator> recordsToMap(Class<? extends Record> [] records) {
		Map<Integer, I_RecordCreator> result = new HashMap<Integer, I_RecordCreator>();
		Set<Class<?>> uniqueRecClasses = new HashSet<Class<?>>(records.length * 3 / 2);

		for (int i = 0; i < records.length; i++) {

			Class<? extends Record> recClass = records[ i ];
			if(!Record.class.isAssignableFrom(recClass)) {
				throw new RuntimeException("Invalid record sub-class (" + recClass.getName() + ")");
			}
			if(Modifier.isAbstract(recClass.getModifiers())) {
				throw new RuntimeException("Invalid record class (" + recClass.getName() + ") - must not be abstract");
			}
			if(!uniqueRecClasses.add(recClass)) {
				throw new RuntimeException("duplicate record class (" + recClass.getName() + ")");
			}

			short sid;
			Constructor<? extends Record> constructor;
			try {
				sid = recClass.getField("sid").getShort(null);
				constructor = recClass.getConstructor(CONSTRUCTOR_ARGS);
			} catch (Exception illegalArgumentException) {
				throw new RecordFormatException(
					"Unable to determine record types");
			}
			Integer key = Integer.valueOf(sid);
			if (result.containsKey(key)) {
				Class<?> prevClass = result.get(key).getRecordClass();
				throw new RuntimeException("duplicate record sid 0x" + Integer.toHexString(sid).toUpperCase()
						+ " for classes (" + recClass.getName() + ") and (" + prevClass.getName() + ")");
			}
			result.put(key, new ReflectionRecordCreator(constructor));
		}
//		result.put(Integer.valueOf(0x0406), result.get(Integer.valueOf(0x06)));
		return result;
	}

	/**
	 * Create an array of records from an input stream
	 *
	 * @param in the InputStream from which the records will be obtained
	 *
	 * @return an array of Records created from the InputStream
	 *
	 * @exception RecordFormatException on error processing the InputStream
	 */
	public static List<Record> createRecords(InputStream in) throws RecordFormatException {

		List<Record> records = new ArrayList<Record>(NUM_RECORDS);

		RecordFactoryInputStream recStream = new RecordFactoryInputStream(in, true);

		Record record;
		while ((record = recStream.nextRecord())!=null) {
			records.add(record);
		}

		return records;
	}
}