org.apache.poi.hpsf.SpecialPropertySet Maven / Gradle / Ivy
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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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See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hpsf;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import org.apache.poi.hpsf.wellknown.PropertyIDMap;
import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.util.LittleEndian;
/**
* Abstract superclass for the convenience classes {@link
* SummaryInformation} and {@link DocumentSummaryInformation}.
*
* The motivation behind this class is quite nasty if you look
* behind the scenes, but it serves the application programmer well by
* providing him with the easy-to-use {@link SummaryInformation} and
* {@link DocumentSummaryInformation} classes. When parsing the data a
* property set stream consists of (possibly coming from an {@link
* java.io.InputStream}) we want to read and process each byte only
* once. Since we don't know in advance which kind of property set we
* have, we can expect only the most general {@link
* PropertySet}. Creating a special subclass should be as easy as
* calling the special subclass' constructor and pass the general
* {@link PropertySet} in. To make things easy internally, the special
* class just holds a reference to the general {@link PropertySet} and
* delegates all method calls to it.
*
* A cleaner implementation would have been like this: The {@link
* PropertySetFactory} parses the stream data into some internal
* object first. Then it finds out whether the stream is a {@link
* SummaryInformation}, a {@link DocumentSummaryInformation} or a
* general {@link PropertySet}. However, the current implementation
* went the other way round historically: the convenience classes came
* only late to my mind.
*/
public abstract class SpecialPropertySet extends MutablePropertySet
{
/**
* The id to name mapping of the properties
* in this set.
*/
public abstract PropertyIDMap getPropertySetIDMap();
/**
* The "real" property set SpecialPropertySet
* delegates to.
*/
private MutablePropertySet delegate;
/**
* Creates a SpecialPropertySet.
*
* @param ps The property set to be encapsulated by the
* SpecialPropertySet
*/
public SpecialPropertySet(final PropertySet ps)
{
delegate = new MutablePropertySet(ps);
}
/**
*
Creates a SpecialPropertySet.
*
* @param ps The mutable property set to be encapsulated by the
* SpecialPropertySet
*/
public SpecialPropertySet(final MutablePropertySet ps)
{
delegate = ps;
}
/**
* @see PropertySet#getByteOrder
*/
public int getByteOrder()
{
return delegate.getByteOrder();
}
/**
* @see PropertySet#getFormat
*/
public int getFormat()
{
return delegate.getFormat();
}
/**
* @see PropertySet#getOSVersion
*/
public int getOSVersion()
{
return delegate.getOSVersion();
}
/**
* @see PropertySet#getClassID
*/
public ClassID getClassID()
{
return delegate.getClassID();
}
/**
* @see PropertySet#getSectionCount
*/
public int getSectionCount()
{
return delegate.getSectionCount();
}
/**
* @see PropertySet#getSections
*/
public List getSections()
{
return delegate.getSections();
}
/**
* @see PropertySet#isSummaryInformation
*/
public boolean isSummaryInformation()
{
return delegate.isSummaryInformation();
}
/**
* @see PropertySet#isDocumentSummaryInformation
*/
public boolean isDocumentSummaryInformation()
{
return delegate.isDocumentSummaryInformation();
}
/**
* @see PropertySet#getSingleSection
*/
public Section getFirstSection()
{
return delegate.getFirstSection();
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#addSection(org.apache.poi.hpsf.Section)
*/
public void addSection(final Section section)
{
delegate.addSection(section);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#clearSections()
*/
public void clearSections()
{
delegate.clearSections();
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#setByteOrder(int)
*/
public void setByteOrder(final int byteOrder)
{
delegate.setByteOrder(byteOrder);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#setClassID(org.apache.poi.hpsf.ClassID)
*/
public void setClassID(final ClassID classID)
{
delegate.setClassID(classID);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#setFormat(int)
*/
public void setFormat(final int format)
{
delegate.setFormat(format);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#setOSVersion(int)
*/
public void setOSVersion(final int osVersion)
{
delegate.setOSVersion(osVersion);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#toInputStream()
*/
public InputStream toInputStream() throws IOException, WritingNotSupportedException
{
return delegate.toInputStream();
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#write(org.apache.poi.poifs.filesystem.DirectoryEntry, java.lang.String)
*/
public void write(final DirectoryEntry dir, final String name) throws WritingNotSupportedException, IOException
{
delegate.write(dir, name);
}
/**
* @see org.apache.poi.hpsf.MutablePropertySet#write(java.io.OutputStream)
*/
public void write(final OutputStream out) throws WritingNotSupportedException, IOException
{
delegate.write(out);
}
/**
* @see org.apache.poi.hpsf.PropertySet#equals(java.lang.Object)
*/
public boolean equals(final Object o)
{
return delegate.equals(o);
}
/**
* @see org.apache.poi.hpsf.PropertySet#getProperties()
*/
public Property[] getProperties() throws NoSingleSectionException
{
return delegate.getProperties();
}
/**
* @see org.apache.poi.hpsf.PropertySet#getProperty(int)
*/
protected Object getProperty(final int id) throws NoSingleSectionException
{
return delegate.getProperty(id);
}
/**
* @see org.apache.poi.hpsf.PropertySet#getPropertyBooleanValue(int)
*/
protected boolean getPropertyBooleanValue(final int id) throws NoSingleSectionException
{
return delegate.getPropertyBooleanValue(id);
}
/**
* @see org.apache.poi.hpsf.PropertySet#getPropertyIntValue(int)
*/
protected int getPropertyIntValue(final int id) throws NoSingleSectionException
{
return delegate.getPropertyIntValue(id);
}
/**
* Fetches the property with the given ID, then does its
* best to return it as a String
* @return The property as a String, or null if unavailable
*/
protected String getPropertyStringValue(final int propertyId) {
Object propertyValue = getProperty(propertyId);
return getPropertyStringValue(propertyValue);
}
protected static String getPropertyStringValue(final Object propertyValue) {
// Normal cases
if (propertyValue == null) return null;
if (propertyValue instanceof String) return (String)propertyValue;
// Do our best with some edge cases
if (propertyValue instanceof byte[]) {
byte[] b = (byte[])propertyValue;
if (b.length == 0) {
return "";
}
if (b.length == 1) {
return Byte.toString(b[0]);
}
if (b.length == 2) {
return Integer.toString( LittleEndian.getUShort(b) );
}
if (b.length == 4) {
return Long.toString( LittleEndian.getUInt(b) );
}
// Maybe it's a string? who knows!
return new String(b);
}
return propertyValue.toString();
}
/**
* @see org.apache.poi.hpsf.PropertySet#hashCode()
*/
public int hashCode()
{
return delegate.hashCode();
}
/**
* @see org.apache.poi.hpsf.PropertySet#toString()
*/
public String toString()
{
return delegate.toString();
}
/**
* @see org.apache.poi.hpsf.PropertySet#wasNull()
*/
public boolean wasNull() throws NoSingleSectionException
{
return delegate.wasNull();
}
}