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/*******************************************************************************
 * Copyright (c) 2004, 2007 Boeing.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.framework.jdk.core.text.rules;

import java.util.LinkedHashSet;
import org.eclipse.osee.framework.jdk.core.text.Rule;
import org.eclipse.osee.framework.jdk.core.text.change.ChangeSet;

/**
 * @author Ryan D. Brooks
 */
public class Unique extends Rule {
   public ChangeSet computeChanges(CharSequence seq) {
      LinkedHashSet<Object> set = new LinkedHashSet<Object>();
      int start = 0;
      int end = 0;
      int length = seq.length();
      ChangeSet changeSet = new ChangeSet(seq);

      for (int i = 0; i < length; i++) {
         if (seq.charAt(i) == '\n') {
            end = i + 1;
            if (!set.add(seq.subSequence(start, end))) { // if set already contains this line
               changeSet.delete(start, end); // then skip over it
            }
            start = end;
         }
      }
      ruleWasApplicable = true;
      return changeSet;
   }
}