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A Java Optimization Framework
There is a newer version: 4.1.0
package soot.javaToJimple;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2004 Jennifer Lhotak
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.List;

public abstract class AbstractJimpleBodyBuilder {

  protected soot.jimple.JimpleBody body;

  public void ext(AbstractJimpleBodyBuilder ext) {
    this.ext = ext;
    if (ext.ext != null) {
      throw new RuntimeException("Extensions created in wrong order.");
    }
    ext.base = this.base;
  }

  public AbstractJimpleBodyBuilder ext() {
    if (ext == null) {
      return this;
    }
    return ext;
  }

  private AbstractJimpleBodyBuilder ext = null;

  public void base(AbstractJimpleBodyBuilder base) {
    this.base = base;
  }

  public AbstractJimpleBodyBuilder base() {
    return base;
  }

  private AbstractJimpleBodyBuilder base = this;

  protected soot.jimple.JimpleBody createJimpleBody(polyglot.ast.Block block, List formals, soot.SootMethod sootMethod) {
    return ext().createJimpleBody(block, formals, sootMethod);
  }

  /*
   * protected soot.Value createExpr(polyglot.ast.Expr expr){ return ext().createExpr(expr); }
   */

  protected soot.Value createAggressiveExpr(polyglot.ast.Expr expr, boolean reduceAggressively, boolean reverseCondIfNec) {
    // System.out.println("in abstract");
    return ext().createAggressiveExpr(expr, reduceAggressively, reverseCondIfNec);
  }

  protected void createStmt(polyglot.ast.Stmt stmt) {
    ext().createStmt(stmt);
  }

  protected boolean needsAccessor(polyglot.ast.Expr expr) {
    return ext().needsAccessor(expr);
  }

  protected soot.Local handlePrivateFieldAssignSet(polyglot.ast.Assign assign) {
    return ext().handlePrivateFieldAssignSet(assign);
  }

  protected soot.Local handlePrivateFieldUnarySet(polyglot.ast.Unary unary) {
    return ext().handlePrivateFieldUnarySet(unary);
  }

  protected soot.Value getAssignRightLocal(polyglot.ast.Assign assign, soot.Local leftLocal) {
    return ext().getAssignRightLocal(assign, leftLocal);
  }

  protected soot.Value getSimpleAssignRightLocal(polyglot.ast.Assign assign) {
    return ext().getSimpleAssignRightLocal(assign);
  }

  protected soot.Local handlePrivateFieldSet(polyglot.ast.Expr expr, soot.Value right, soot.Value base) {
    return ext().handlePrivateFieldSet(expr, right, base);
  }

  protected soot.SootMethodRef getSootMethodRef(polyglot.ast.Call call) {
    return ext().getSootMethodRef(call);
  }

  protected soot.Local generateLocal(soot.Type sootType) {
    return ext().generateLocal(sootType);
  }

  protected soot.Local generateLocal(polyglot.types.Type polyglotType) {
    return ext().generateLocal(polyglotType);
  }

  protected soot.Local getThis(soot.Type sootType) {
    return ext().getThis(sootType);
  }

  protected soot.Value getBaseLocal(polyglot.ast.Receiver receiver) {
    return ext().getBaseLocal(receiver);
  }

  protected soot.Value createLHS(polyglot.ast.Expr expr) {
    return ext().createLHS(expr);
  }

  protected soot.jimple.FieldRef getFieldRef(polyglot.ast.Field field) {
    return ext().getFieldRef(field);
  }

  protected soot.jimple.Constant getConstant(soot.Type sootType, int val) {
    return ext().getConstant(sootType, val);
  }
}