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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.ddf;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.util.LittleEndian;
/**
* Generates a property given a reference into the byte array storing that property.
*/
public final class EscherPropertyFactory {
/**
* Create new properties from a byte array.
*
* @param data The byte array containing the property
* @param offset The starting offset into the byte array
* @param numProperties The number of properties to be read
* @return The new properties
*/
public List<EscherProperty> createProperties(byte[] data, int offset, short numProperties) {
List<EscherProperty> results = new ArrayList<EscherProperty>();
int pos = offset;
for (int i = 0; i < numProperties; i++) {
short propId;
int propData;
propId = LittleEndian.getShort( data, pos );
propData = LittleEndian.getInt( data, pos + 2 );
short propNumber = (short) ( propId & (short) 0x3FFF );
boolean isComplex = ( propId & (short) 0x8000 ) != 0;
// boolean isBlipId = ( propId & (short) 0x4000 ) != 0;
byte propertyType = EscherProperties.getPropertyType(propNumber);
EscherProperty ep;
switch (propertyType) {
case EscherPropertyMetaData.TYPE_BOOLEAN:
ep = new EscherBoolProperty( propId, propData );
break;
case EscherPropertyMetaData.TYPE_RGB:
ep = new EscherRGBProperty( propId, propData );
break;
case EscherPropertyMetaData.TYPE_SHAPEPATH:
ep = new EscherShapePathProperty( propId, propData );
break;
default:
if ( !isComplex ) {
ep = new EscherSimpleProperty( propId, propData );
} else if ( propertyType == EscherPropertyMetaData.TYPE_ARRAY) {
ep = new EscherArrayProperty( propId, new byte[propData]);
} else {
ep = new EscherComplexProperty( propId, new byte[propData]);
}
break;
}
results.add( ep );
pos += 6;
}
// Get complex data
for (EscherProperty p : results) {
if (p instanceof EscherComplexProperty) {
if (p instanceof EscherArrayProperty) {
pos += ((EscherArrayProperty)p).setArrayData(data, pos);
} else {
byte[] complexData = ((EscherComplexProperty)p).getComplexData();
int leftover = data.length - pos;
if (leftover < complexData.length) {
throw new IllegalStateException("Could not read complex escher property, length was " + complexData.length + ", but had only " +
leftover + " bytes left");
}
System.arraycopy(data, pos, complexData, 0, complexData.length);
pos += complexData.length;
}
}
}
return results;
}
}
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