content: /* ***** BEGIN LICENSE BLOCK *****
   * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   *
   * The contents of this file are subject to the Mozilla Public License Version
   * 1.1 (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.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the
   * License.
   *
   * The Original Code is Mozilla Universal charset detector code.
   *
   * The Initial Developer of the Original Code is
   * Netscape Communications Corporation.
   * Portions created by the Initial Developer are Copyright (C) 2001
   * the Initial Developer. All Rights Reserved.
   *
   * Contributor(s):
   *          Shy Shalom <shooshX@gmail.com>
   *          Kohei TAKETA <k-tak@void.in> (Java port)
   *
   * Alternatively, the contents of this file may be used under the terms of
   * either the GNU General Public License Version 2 or later (the "GPL"), or
   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
   * in which case the provisions of the GPL or the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of either the GPL or the LGPL, and not to allow others to
   * use your version of this file under the terms of the MPL, indicate your
   * decision by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL or the LGPL. If you do not delete
   * the provisions above, a recipient may use your version of this file under
   * the terms of any one of the MPL, the GPL or the LGPL.
   *
   * ***** END LICENSE BLOCK ***** */
  
  package org.mozilla.universalchardet.prober;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class MBCSGroupProber extends CharsetProber {
      ////////////////////////////////////////////////////////////////
      // fields
      ////////////////////////////////////////////////////////////////
      private ProbingState        state;
      private List<CharsetProber> probers = new ArrayList<>();
      private CharsetProber       bestGuess;
      private int                 activeNum;
  
  
      ////////////////////////////////////////////////////////////////
      // methods
      ////////////////////////////////////////////////////////////////
  	public MBCSGroupProber() {
  		super();
  
  
  		
  		probers.add(new GB18030Prober());
  		probers.add(new UTF8Prober());
  		probers.add(new Big5Prober());
  		probers.add(new SJISProber());
  		probers.add(new EUCJPProber());
  		probers.add(new EUCKRProber());
  		probers.add(new EUCTWProber());
  
  		reset();
  	}
  
      @Override
  	public String getCharSetName() {
  		if (this.bestGuess == null) {
  			getConfidence();
  			if (this.bestGuess == null) {
  				this.bestGuess = probers.get(0);
  			}
  		}
  		return this.bestGuess.getCharSetName();
  	}
  
      @Override
  	public float getConfidence() {
          float bestConf = 0.0f;
          float cf;
  
          if (this.state == ProbingState.FOUND_IT) {
              return 0.99f;
          } else if (this.state == ProbingState.NOT_ME) {
              return 0.01f;
          } else {
          	for(CharsetProber prober: probers) {
          		if (!prober.isActive()) {
          			continue;
          		}
          		cf = prober.getConfidence();
                  if (bestConf < cf) {
                      bestConf = cf;
                      this.bestGuess = prober;
                  }
          	}
          }
  
          return bestConf;
      }
  
      @Override
  	public ProbingState getState() {
          return this.state;
      }
  
      @Override
  	public ProbingState handleData(byte[] buf, int offset, int length) {
          ProbingState st;
          
          boolean keepNext = true;
          byte[] highbyteBuf = new byte[length];
          int highpos = 0;
  
          int maxPos = offset + length;
          for (int i=offset; i<maxPos; ++i) {
              if ((buf[i] & 0x80) != 0) {
                  highbyteBuf[highpos++] = buf[i];
                  keepNext = true;
              } else {
                  //if previous is highbyte, keep this even it is a ASCII
                  if (keepNext) {
                      highbyteBuf[highpos++] = buf[i];
                      keepNext = false;
                  }
              }
          }
          
          for(CharsetProber prober: this.probers) {
          	if (!prober.isActive()) {
          		continue;
          	}
          	st = prober.handleData(highbyteBuf, 0, highpos);
          	if (st == ProbingState.FOUND_IT || 0.99f == prober.getConfidence()) {
                  this.bestGuess = prober;
                  this.state = ProbingState.FOUND_IT;
                  break;
              } else if (st == ProbingState.NOT_ME) {
                  prober.setActive(false);
                  this.activeNum--;
                  if (this.activeNum <= 0) {
                      this.state = ProbingState.NOT_ME;
                      break;
                  }
              }
          }
          
          return this.state;
      }
  
      @Override
  	public final void reset() {
          this.activeNum = 0;
          for (CharsetProber prober: this.probers) {
              prober.reset();
              prober.setActive(true);
              this.activeNum++;
          }
          this.bestGuess = null;
          this.state = ProbingState.DETECTING;
      }
  
      @Override
      public void setOption()
      {}
  }
  