EAM.java

/**
 * Copyright (C) 2015  the original author or authors.
 *
 * Licensed 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 mujava.op;

import java.io.*;
import openjava.mop.*;
import openjava.ptree.*;

/**
 * <p>Generate EAM (Java-specific accessor method change) mutants --
 *    change the accessor method name for other compatible accessor 
 *    method names. Note: <i>compatible</i> means that the signatures
 *    are the same except the method name
 * </p>
 * <p><i>Example</i>: point.getX(); is mutated to point.getY();
 * </p>
 * @author Yu-Seung Ma
 * @version 1.0
  */

public class EAM extends mujava.op.util.Mutator
{
   public EAM(FileEnvironment file_env, ClassDeclaration cdecl, CompilationUnit comp_unit)
   {
	  super( file_env, comp_unit );
   }

   public void visit( MethodCall p ) throws ParseTreeException 
   {
      int i;
      MethodCall mutant = null;
      String method_name = p.getName();

      if ((method_name.indexOf("get") == 0) && (p.getArguments().size() == 0))
      {
         Environment env = getEnvironment();
         Expression ref = p.getReferenceExpr();

         // defined in same class
         OJClass bindedtype = null;
         if (ref == null)
         {
			bindedtype = env.lookupClass(env.currentClassName());
         }
         else if (ref instanceof Variable)
         {
		    bindedtype = env.lookupBind(ref.toString());
         } 

         if (bindedtype != null)
         {
			try
			{
			   OJMethod[] m = bindedtype.getAllMethods();
			   boolean[] find_flag = new boolean[m.length];
			   int method_index = -1;
			   for ( i=0; i<m.length ; i++)
			   {
				  find_flag[i]=false;
				  // find my method
				  if ( m[i].getName().equals(method_name))
				  {
					 //my_method = m[i];
					 method_index = i;
				 	 break;
				  }
			   }

			   if (method_index != -1)
			   {
 				  int set_num = 0;
				  for ( i=0; i<m.length; i++)
				  {
					 if ( (i != method_index) && (m[i].getName().indexOf("get") == 0)
						  && sameReturnType(m[i],m[method_index])
						  && sameParameterType(m[i],m[method_index])) 
					 {
				        find_flag[i] = true;
				        set_num++;
					 }
				  }
				  
				  if (set_num>0)
				  {
					 for (i=0; i<m.length; i++)
					 {
					    if (find_flag[i])
					    {
						   mutant = (MethodCall)p.makeRecursiveCopy();
					   	   mutant.setName(m[i].getName());
						   outputToFile(p, mutant);
					    }
					 }
					 return;
				  }
			   } 
			} catch ( Exception e)
			{
			   System.err.println(" [error] " + e + " :  " + p.toString());
               e.printStackTrace();
			}
         }
      } 

      Expression newp = this.evaluateDown( p );
      if (newp != p) 
      {
         p.replace( newp );
         return;
      }

      p.childrenAccept( this );
      newp = this.evaluateUp( p );
      if (newp != p)  
    	 p.replace( newp );
   }

   /**
    * Output EAM mutants to files
    * @param original
    * @param mutant
    */
   public void outputToFile(MethodCall original, MethodCall mutant)
   {
      if (comp_unit == null) 
    	 return;

      String f_name;
      num++;
      f_name = getSourceName(this);
      String mutant_dir = getMuantID();

      try 
      {
		 PrintWriter out = getPrintWriter(f_name);
	 	 EAM_Writer writer = new EAM_Writer( mutant_dir, out );
		 writer.setMutant(original, mutant);
		 comp_unit.accept( writer );
		 out.flush();  
		 out.close();
      } catch ( IOException e ) {
		 System.err.println( "fails to create " + f_name );
      } catch ( ParseTreeException e ) {
		 System.err.println( "errors during printing " + f_name );
		 e.printStackTrace();
      }
   }

}