/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.libraries.serializer.methods;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.text.CharacterIterator;
import java.util.HashMap;
import java.util.Map;
import org.pentaho.reporting.libraries.serializer.SerializeMethod;
/**
* A serializer-method to serialize and deserialize attributed-strings.
*
* @author Thomas Morgner
*/
public class AttributedStringSerializer implements SerializeMethod
{
/**
* Default constructor.
*/
public AttributedStringSerializer()
{
}
/**
* Writes a serializable object description to the given object output
* stream.
*
* @param o the to be serialized object.
* @param stream the outputstream that should receive the object.
* @throws IOException if an I/O error occured.
*/
public void writeObject(final Object o, final ObjectOutputStream stream) throws IOException
{
final AttributedString as = (AttributedString) o;
final AttributedCharacterIterator aci = as.getIterator();
// build a plain string from aci
// then write the string
StringBuffer plainStr = new StringBuffer(100);
char current = aci.first();
while (current != CharacterIterator.DONE) {
plainStr = plainStr.append(current);
current = aci.next();
}
stream.writeObject(plainStr.toString());
// then write the attributes and limits for each run
current = aci.first();
final int begin = aci.getBeginIndex();
while (current != CharacterIterator.DONE) {
// write the current character - when the reader sees that this
// is not CharacterIterator.DONE, it will know to read the
// run limits and attributes
stream.writeChar(current);
// now write the limit, adjusted as if beginIndex is zero
final int limit = aci.getRunLimit();
stream.writeInt(limit - begin);
// now write the attribute set
final Map<AttributedCharacterIterator.Attribute,Object> atts =
new HashMap<AttributedCharacterIterator.Attribute,Object>(aci.getAttributes());
stream.writeObject(atts);
current = aci.setIndex(limit);
}
// write a character that signals to the reader that all runs
// are done...
stream.writeChar(CharacterIterator.DONE);
}
/**
* Reads the object from the object input stream.
*
* @param stream the object input stream from where to read the serialized data.
* @return the generated object.
* @throws IOException if reading the stream failed.
* @throws ClassNotFoundException if serialized object class cannot be found.
*/
public Object readObject(final ObjectInputStream stream)
throws IOException, ClassNotFoundException
{
// read string and attributes then create result
final String plainStr = (String) stream.readObject();
final AttributedString result = new AttributedString(plainStr);
char c = stream.readChar();
int start = 0;
while (c != CharacterIterator.DONE) {
final int limit = stream.readInt();
final Map<AttributedCharacterIterator.Attribute,Object> atts =
(Map<AttributedCharacterIterator.Attribute,Object>) stream.readObject();
result.addAttributes(atts, start, limit);
start = limit;
c = stream.readChar();
}
return result;
}
/**
* The class of the object, which this object can serialize.
*
* @return the class of the object type, which this method handles.
*/
public Class getObjectClass()
{
return AttributedString.class;
}
}