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/*
* Oreka -- A media capture and retrieval platform
*
* Copyright (C) 2005, orecx LLC
*
* http://www.orecx.com
*
* This program is free software, distributed under the terms of
* the GNU General Public License.
* Please refer to http://www.gnu.org/copyleft/gpl.html
*
*/
package net.sf.oreka.serializers;
import net.sf.oreka.OrkException;
import net.sf.oreka.OrkObject;
import net.sf.oreka.OrkObjectFactory;
/**
* Serializer that generates and parses objects to and from a single line of text.
* key-value pairs are separated by spaces.
* key and values are separated by equal signs.
* example: message=doit what=run
*/
public class SingleLineSerializer extends KeyValueSerializer
{
StringBuffer output;
public String serialize(OrkObject input) throws OrkException
{
output = new StringBuffer();
deserialize = false; // Set Serialize mode
addClassName(input.getOrkClassName());
input.define(this);
return output.toString();
}
enum SingleLineState {StartState, KeyState, ValueState};
public OrkObject deSerialize(String input) throws OrkException
{
// read string and extract values into map
input = input.trim();
SingleLineState state = SingleLineState.StartState;
StringBuffer key = new StringBuffer();
StringBuffer value = new StringBuffer();
String firstValue = null;
for(int i=0; i<input.length(); i++)
{
Character character = input.charAt(i);
switch(state)
{
case StartState:
if(character == ' ')
{
; // ignore spaces
}
else if ( Character.isLetterOrDigit(character) )
{
state = SingleLineState.KeyState;
key.append(character);
}
else
{
throw new OrkException("SingleLineSerializer.deSerialize: Cannot find key start, keys must be alphanum, wrong char:" + character + " input:" + input);
}
break;
case KeyState:
if( Character.isLetterOrDigit(character) )
{
key.append(character);
}
else if (character == '=')
{
state = SingleLineState.ValueState;
value = new StringBuffer();
}
else
{
throw new OrkException("SingleLineSerializer.deSerialize: Invalid key character, keys must be alphanum, wrong char:" + character + " input:" + input);
}
break;
case ValueState:
if( character == '=')
{
throw new OrkException("SingleLineSerializer.deSerialize: equals sign misplaced at index:" + i + " in input:" + input);
}
else if (character == ' ')
{
state = SingleLineState.StartState;
}
else
{
value.append(character);
}
break;
} // switch(state)
if ( (state == SingleLineState.StartState) || (i == (input.length()-1)) )
{
if (key.length() > 0)
{
// Add pair to key-value map
map.put(key.toString().toLowerCase(), unEscapeSingleLine(value.toString()));
if (firstValue == null)
{
firstValue = value.toString().toLowerCase();
}
key = new StringBuffer();
value = new StringBuffer();
}
}
}
deserialize = true; // Set DeSerialize mode
OrkObject obj = OrkObjectFactory.instance().newOrkObject(firstValue);
obj.define(this);
obj.validate();
return obj;
}
public void addClassName(String value)
{
addString(classKey, value);
}
void addString(String key, String value)
{
String pair;
String escapedValue = escapeSingleLine(value);
pair = key + "=" + escapedValue + " ";
output.append(pair);
}
/**
* Finds the Object Class from a serialized string.
* i.e. for a serialized object of the form:
* message=dosomething when=now
* it returns "dosomething"
*
* @param input
* @return
*/
/*
static String findClass(String input)
{
String result = "";
int equalsPosition = input.indexOf("=");
if (equalsPosition != -1)
{
int spacePostion = input.indexOf(" ");
if (spacePostion > equalsPosition)
{
result = input.substring(equalsPosition+1, spacePostion-1);
}
else
{
result = input.substring(equalsPosition+1, input.length() - 1);
}
}
return result.toLowerCase();
}
*/
String escapeSingleLine(String in)
{
StringBuffer out = new StringBuffer();
for(int i=0; i<in.length();i++)
{
char c = in.charAt(i);
if (c == ' ')
{
out.append("%s");
}
else if (c == ':')
{
out.append("%c");
}
else if (c == '%')
{
out.append("%p");
}
else
{
out.append(c);
}
}
return out.toString();
}
String unEscapeSingleLine(String in)
{
StringBuffer out = new StringBuffer();
int iin = 0;
while(iin<in.length())
{
if ( in.charAt(iin) == '%')
{
iin++;
switch (in.charAt(iin))
{
case 's':
out.append(' ');
break;
case 'c':
out.append(':');
break;
case 'p':
out.append('%');
break;
}
}
else
{
out.append(in.charAt(iin));
}
iin++;
}
return out.toString();
}
}
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