/* $Id$ */
/**
* 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.manifoldcf.scriptengine;
import java.io.*;
/** Convert a Reader into a sequence of characters, while keeping track of line
* endings.
*/
public class CharacterStream
{
protected Reader reader;
protected int currentCharacter = -1;
protected int lineNumber = 0;
protected int characterNumber = 0;
public CharacterStream(Reader reader)
{
this.reader = reader;
}
public int peek()
throws ScriptException
{
if (currentCharacter == -1)
currentCharacter = readNextCharacter();
return currentCharacter;
}
public void skip()
{
currentCharacter = -1;
}
public int getLineNumber()
{
return lineNumber;
}
public int getCharacterNumber()
{
return characterNumber;
}
// Protected methods
protected int readNextCharacter()
throws ScriptException
{
if (reader == null)
return -1;
try
{
int rval = reader.read();
if (rval == -1)
{
reader.close();
reader = null;
return -1;
}
characterNumber++;
if (((char)rval) == '\n')
{
lineNumber++;
characterNumber = 0;
}
return rval;
}
catch (IOException e)
{
throw new ScriptException("I/O exception: "+e.getMessage(),e);
}
}
}