/*
 *  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.myfaces.buildtools.maven2.plugin.javascript.obfuscator.filters.output;

import org.apache.myfaces.buildtools.maven2.plugin.javascript.obfuscator.filters.ObfuscatorFilter;
import org.apache.myfaces.buildtools.maven2.plugin.javascript.obfuscator.javascript15parser.AnnotatedToken;
import org.apache.myfaces.buildtools.maven2.plugin.javascript.obfuscator.javascript15parser.Token;

import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;


public class OutputGenerator implements ObfuscatorFilter
{
  private PrintStream _outStream;

  public OutputGenerator()
  {
  }

  public OutputGenerator(OutputStream outStream)
  {
    _outStream = new PrintStream(new BufferedOutputStream(outStream));
  }

  public AnnotatedToken filter(AnnotatedToken startToken)
  {
    AnnotatedToken token = startToken;

    while (token != null)
    {
      printToken(token);
      token = token.getNext();
    }

    _outStream.flush();

    return startToken;
  }

  public void setOutputStream(OutputStream outStream)
  {
    _outStream = new PrintStream(new BufferedOutputStream(outStream));
  }

  public PrintStream getOutputStream()
  {
    return _outStream;
  }

  private void printToken(Token token)
  {
    // print special tokens first
    if (token.specialToken != null)
    {
      printToken(token.specialToken);
    }

    _outStream.print(token.image);
  }
}