| /* ==================================================================== |
| 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 java.util.function.BiFunction; |
| |
| 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<>(); |
| |
| int pos = offset; |
| |
| for (int i = 0; i < numProperties; i++) { |
| final short propId = LittleEndian.getShort( data, pos ); |
| final int propData = LittleEndian.getInt( data, pos + 2 ); |
| final boolean isComplex = ( propId & EscherProperty.IS_COMPLEX ) != 0; |
| |
| EscherPropertyTypes propertyType = EscherPropertyTypes.forPropertyID(propId); |
| |
| final BiFunction<Short,Integer,EscherProperty> con; |
| switch (propertyType.holder) { |
| case BOOLEAN: |
| con = EscherBoolProperty::new; |
| break; |
| case RGB: |
| con = EscherRGBProperty::new; |
| break; |
| case SHAPE_PATH: |
| con = EscherShapePathProperty::new; |
| break; |
| default: |
| if ( isComplex ) { |
| con = (propertyType.holder == EscherPropertyTypesHolder.ARRAY) |
| ? EscherArrayProperty::new |
| : EscherComplexProperty::new; |
| } else { |
| con = EscherSimpleProperty::new; |
| } |
| break; |
| } |
| |
| results.add( con.apply(propId,propData) ); |
| pos += 6; |
| } |
| |
| // Get complex data |
| for (EscherProperty p : results) { |
| if (p instanceof EscherArrayProperty) { |
| EscherArrayProperty eap = (EscherArrayProperty)p; |
| pos += eap.setArrayData(data, pos); |
| } else if (p instanceof EscherComplexProperty) { |
| EscherComplexProperty ecp = (EscherComplexProperty)p; |
| int cdLen = ecp.getComplexData().length; |
| int leftover = data.length - pos; |
| if (leftover < cdLen) { |
| throw new IllegalStateException("Could not read complex escher property, length was " + |
| cdLen + ", but had only " + leftover + " bytes left"); |
| } |
| pos += ecp.setComplexData(data, pos); |
| } |
| } |
| return results; |
| } |
| } |