/**
 * {@inheritDoc}
 */
@Override
protected ASTVisitor handleGetCorrectingASTVisitor(final IRegion lineInfo,
        final int markerStartPosition) {

  return new ASTVisitor() {
    @Override
    public boolean visit(EmptyStatement node) {
      if (containsPosition(lineInfo, node.getStartPosition())) {

        // early exit if the statement is mandatory, e.g. only
        // statement in a for-statement without block
        StructuralPropertyDescriptor p = node.getLocationInParent();
        if (p.isChildProperty() && ((ChildPropertyDescriptor) p).isMandatory()) {
          return false;
        }

        node.delete();
      }
      return false;
    }
  };
}
 

@Override
public ASTVisitor getCorrectingASTVisitor(IRegion lineInfo, int markerStartOffset) {
    return new ASTVisitor() {
        @Override
        public boolean visit(EmptyStatement node) {
            if (containsPosition(lineInfo, node.getStartPosition())) {

                // early exit if the statement is mandatory, e.g. only
                // statement in a for-statement without block
                final StructuralPropertyDescriptor p = node.getLocationInParent();
                if (p.isChildProperty() && ((ChildPropertyDescriptor) p).isMandatory()) {
                    return false;
                }

                node.delete();
            }
            return false;
        }
    };
}
 

public ASTNode genericChildProperty(final ASTNode node, final String propertyName) {
  final Function1<ChildPropertyDescriptor, Boolean> _function = (ChildPropertyDescriptor it) -> {
    String _id = it.getId();
    return Boolean.valueOf(Objects.equal(propertyName, _id));
  };
  final ChildPropertyDescriptor property = IterableExtensions.<ChildPropertyDescriptor>head(IterableExtensions.<ChildPropertyDescriptor>filter(Iterables.<ChildPropertyDescriptor>filter(node.structuralPropertiesForType(), ChildPropertyDescriptor.class), _function));
  if ((property != null)) {
    Object _structuralProperty = node.getStructuralProperty(property);
    return ((ASTNode) _structuralProperty);
  }
  return null;
}
 

public boolean isDangligIf() {
	List<Statement> statements= fDeclaration.getBody().statements();
	if (statements.size() != 1)
		return false;

	ASTNode p= statements.get(0);

	while (true) {
		if (p instanceof IfStatement) {
			return ((IfStatement) p).getElseStatement() == null;
		} else {

			ChildPropertyDescriptor childD;
			if (p instanceof WhileStatement) {
				childD= WhileStatement.BODY_PROPERTY;
			} else if (p instanceof ForStatement) {
				childD= ForStatement.BODY_PROPERTY;
			} else if (p instanceof EnhancedForStatement) {
				childD= EnhancedForStatement.BODY_PROPERTY;
			} else if (p instanceof DoStatement) {
				childD= DoStatement.BODY_PROPERTY;
			} else if (p instanceof LabeledStatement) {
				childD= LabeledStatement.BODY_PROPERTY;
			} else {
				return false;
			}
			Statement body= (Statement) p.getStructuralProperty(childD);
			if (body instanceof Block) {
				return false;
			} else {
				p= body;
			}
		}
	}
}
 

private void handle(Statement body, ChildPropertyDescriptor bodyProperty) {
	if ((body.getFlags() & ASTNode.RECOVERED) != 0)
		return;
	Statement parent= (Statement)body.getParent();
	if ((parent.getFlags() & ASTNode.RECOVERED) != 0)
		return;

	if (fRemoveUnnecessaryBlocksOnlyWhenReturnOrThrow) {
		if (!(body instanceof Block)) {
			if (body.getNodeType() != ASTNode.IF_STATEMENT && body.getNodeType() != ASTNode.RETURN_STATEMENT && body.getNodeType() != ASTNode.THROW_STATEMENT) {
				fResult.add(new AddBlockOperation(bodyProperty, body, parent));
			}
		} else {
			if (RemoveBlockOperation.satisfiesCleanUpPrecondition(parent, bodyProperty, true)) {
				fResult.add(new RemoveBlockOperation(parent, bodyProperty));
			}
		}
	} else if (fFindControlStatementsWithoutBlock) {
		if (!(body instanceof Block)) {
			fResult.add(new AddBlockOperation(bodyProperty, body, parent));
		}
	} else if (fRemoveUnnecessaryBlocks) {
		if (RemoveBlockOperation.satisfiesCleanUpPrecondition(parent, bodyProperty, false)) {
			fResult.add(new RemoveBlockOperation(parent, bodyProperty));
		}
	}
}
 

@Override
protected ChildPropertyDescriptor getJavaDocProperty() {
	return MethodDeclaration.JAVADOC_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getBodyProperty() {
	return MethodDeclaration.BODY_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getJavaDocProperty() {
	return FieldDeclaration.JAVADOC_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getBodyProperty() {
	return VariableDeclarationFragment.INITIALIZER_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getJavaDocProperty() {
	return MethodDeclaration.JAVADOC_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getBodyProperty() {
	return MethodDeclaration.BODY_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getJavaDocProperty() {
	return FieldDeclaration.JAVADOC_PROPERTY;
}
 

@Override
protected ChildPropertyDescriptor getBodyProperty() {
	return VariableDeclarationFragment.INITIALIZER_PROPERTY;
}
 

public AddBlockOperation(ChildPropertyDescriptor bodyProperty, Statement body, Statement controlStatement) {
	fBodyProperty= bodyProperty;
	fBody= body;
	fControlStatement= controlStatement;
}
 

public RemoveBlockOperation(Statement controlStatement, ChildPropertyDescriptor child) {
	fStatement= controlStatement;
	fChild= child;
}
 

public static boolean satisfiesCleanUpPrecondition(Statement controlStatement, ChildPropertyDescriptor childDescriptor, boolean onlyReturnAndThrows) {
	return satisfiesPrecondition(controlStatement, childDescriptor, onlyReturnAndThrows, true);
}
 

public static boolean satisfiesQuickAssistPrecondition(Statement controlStatement, ChildPropertyDescriptor childDescriptor) {
	return satisfiesPrecondition(controlStatement, childDescriptor, false, false);
}
 

private static boolean satisfiesPrecondition(Statement controlStatement, ChildPropertyDescriptor childDescriptor, boolean onlyReturnAndThrows, boolean cleanUpCheck) {
	Object child= controlStatement.getStructuralProperty(childDescriptor);

	if (!(child instanceof Block))
		return false;

	Block block= (Block)child;
	List<Statement> list= block.statements();
	if (list.size() != 1)
		return false;

	ASTNode singleStatement= list.get(0);

	if (onlyReturnAndThrows)
		if (!(singleStatement instanceof ReturnStatement) && !(singleStatement instanceof ThrowStatement))
			return false;

	if (controlStatement instanceof IfStatement) {
		// if (true) {
		//  while (true)
		// 	 if (false)
		//    ;
		// } else
		//   ;

		if (((IfStatement)controlStatement).getThenStatement() != child)
			return true;//can always remove blocks in else part

		IfStatement ifStatement= (IfStatement)controlStatement;
		if (ifStatement.getElseStatement() == null)
			return true;//can always remove if no else part

		return !hasUnblockedIf((Statement)singleStatement, onlyReturnAndThrows, cleanUpCheck);
	} else {
		//if (true)
		// while (true) {
		//  if (false)
		//   ;
		// }
		//else
		// ;
		if (!hasUnblockedIf((Statement)singleStatement, onlyReturnAndThrows, cleanUpCheck))
			return true;

		ASTNode currentChild= controlStatement;
		ASTNode parent= currentChild.getParent();
		while (true) {
			Statement body= null;
			if (parent instanceof IfStatement) {
				body= ((IfStatement)parent).getThenStatement();
				if (body == currentChild && ((IfStatement)parent).getElseStatement() != null)//->currentChild is an unblocked then part
					return false;
			} else if (parent instanceof WhileStatement) {
				body= ((WhileStatement)parent).getBody();
			} else if (parent instanceof DoStatement) {
				body= ((DoStatement)parent).getBody();
			} else if (parent instanceof ForStatement) {
				body= ((ForStatement)parent).getBody();
			} else if (parent instanceof EnhancedForStatement) {
				body= ((EnhancedForStatement)parent).getBody();
			} else {
				return true;
			}
			if (body != currentChild)//->parents child is a block
				return true;

			currentChild= parent;
			parent= currentChild.getParent();
		}
	}
}
 

/**
 * Returns the javadoc property descriptor. The javadoc will be added using
 * this descriptor.
 *
 * @return property descriptor
 */
protected abstract ChildPropertyDescriptor getJavaDocProperty();
 

/**
 * Returns the body property descriptor. The body of the delegate will be
 * added using this descriptor.
 *
 * @return property descriptor
 */
protected abstract ChildPropertyDescriptor getBodyProperty();
 

/**
 * Returns the javadoc property descriptor. The javadoc will be added using
 * this descriptor.
 *
 * @return property descriptor
 */
protected abstract ChildPropertyDescriptor getJavaDocProperty();
 

/**
 * Returns the body property descriptor. The body of the delegate will be
 * added using this descriptor.
 *
 * @return property descriptor
 */
protected abstract ChildPropertyDescriptor getBodyProperty();