/******************************************************************************
 * Copyright (c) 2002 - 2006 IBM Corporation.
 * 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:
 *     IBM Corporation - initial API and implementation
 *****************************************************************************/
package com.ibm.wala.cast.ipa.callgraph;

import com.ibm.wala.cast.ipa.callgraph.AstCallGraph.*;
import com.ibm.wala.classLoader.*;
import com.ibm.wala.ipa.callgraph.*;
import com.ibm.wala.ipa.callgraph.impl.*;
import com.ibm.wala.ipa.cha.*;
import com.ibm.wala.ssa.*;
import com.ibm.wala.types.*;
import com.ibm.wala.util.debug.Assertions;
import com.ibm.wala.util.warnings.WarningSet;

import java.util.*;

public abstract class ScriptEntryPoints implements Entrypoints {

  private final ClassHierarchy cha;
  private final IClass scriptType;

  private class ScriptEntryPoint extends Entrypoint {
    ScriptEntryPoint(IMethod scriptCodeBody) {
      super( scriptCodeBody );
    }

    public TypeReference[] getParameterTypes(int i) {
      Assertions._assert(i == 0);      
      return 
	new TypeReference[]{ getMethod().getDeclaringClass().getReference() };
    }
  
    public int getNumberOfParameters() {
      return 1;
    }

    public SSAAbstractInvokeInstruction addCall(FakeRootMethod m,
						WarningSet warnings) 
    {
      CallSiteReference site = makeSite(0);

      if (site == null) {
	return null;
      }

      int functionVn = makeArgument(m, 0, warnings);
      int paramVns[] = new int[getNumberOfParameters() - 1];
      for (int j = 0; j < paramVns.length; j++) {
	paramVns[j] = makeArgument(m, j+1, warnings);
      }

      return ((ScriptFakeRoot)m).addDirectCall(functionVn, paramVns, site);
    }
  }

  public ScriptEntryPoints(ClassHierarchy cha, IClass scriptType) {
    this.cha = cha;
    this.scriptType = scriptType;
  }

  public Iterator iterator() {
    Set ES = new HashSet();
    Iterator classes = scriptType.getClassLoader().iterateAllClasses();
    while ( classes.hasNext() ) {
      IClass cls = (IClass)classes.next();
      if (cha.isSubclassOf(cls, scriptType)) {
	for (Iterator methods = cls.getDeclaredMethods().iterator(); methods.hasNext();) {
	  ES.add(new ScriptEntryPoint(((IMethod)methods.next())));
	}
      }
    }
    
    return ES.iterator();
  }
    
}