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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.expression;

import java.util.List;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A simple scanner for {@link JavaExpression}.
 *
 * @param  the parameter passed to the scan methods
 */
public abstract class JavaExpressionScanner extends JavaExpressionVisitor {

  /**
   * Scans the JavaExpression.
   *
   * @param javaExpression the expression to scan.
   * @param p parameter to pass
   */
  public void scan(JavaExpression javaExpression, P p) {
    visit(javaExpression, p);
  }

  /**
   * Scans each JavaExpression in {@code expressions}.
   *
   * @param expressions a list of JavaExpressions to scan
   * @param p pameter to pass
   */
  public void scan(List expressions, P p) {
    for (JavaExpression expression : expressions) {
      if (expression != null) {
        visit(expression, p);
      }
    }
  }

  @Override
  protected Void visitArrayAccess(ArrayAccess arrayAccessExpr, P p) {
    visit(arrayAccessExpr.getArray(), p);
    visit(arrayAccessExpr.getIndex(), p);
    return null;
  }

  @Override
  protected Void visitArrayCreation(ArrayCreation arrayCreationExpr, P p) {
    scan(arrayCreationExpr.getDimensions(), p);
    scan(arrayCreationExpr.getInitializers(), p);
    return null;
  }

  @Override
  protected Void visitBinaryOperation(BinaryOperation binaryOpExpr, P p) {
    visit(binaryOpExpr.getLeft(), p);
    visit(binaryOpExpr.getRight(), p);
    return null;
  }

  @Override
  protected Void visitClassName(ClassName classNameExpr, P p) {
    return null;
  }

  @Override
  protected Void visitFormalParameter(FormalParameter parameterExpr, P p) {
    return null;
  }

  @Override
  protected Void visitFieldAccess(FieldAccess fieldAccessExpr, P p) {
    visit(fieldAccessExpr.getReceiver(), p);
    return null;
  }

  @Override
  protected Void visitLocalVariable(LocalVariable localVarExpr, P p) {
    return null;
  }

  @Override
  protected Void visitMethodCall(MethodCall methodCallExpr, P p) {
    visit(methodCallExpr.getReceiver(), p);
    scan(methodCallExpr.getArguments(), p);
    return null;
  }

  @Override
  protected Void visitThisReference(ThisReference thisExpr, P p) {
    return null;
  }

  @Override
  protected Void visitUnaryOperation(UnaryOperation unaryOpExpr, P p) {
    visit(unaryOpExpr.getOperand(), p);
    return null;
  }

  @Override
  protected Void visitUnknown(Unknown unknownExpr, P p) {
    return null;
  }

  @Override
  protected Void visitValueLiteral(ValueLiteral literalExpr, P p) {
    return null;
  }
}