org.eclipse.jdt.internal.ui.text.correction.proposals.ExtractToNullCheckedLocalProposal java code examples

/**
 * Fix for {@link IProblem#NullableFieldReference}
 * @param context context
 * @param problem problem to be fixed
 * @param proposals accumulator for computed proposals
 */
public static void addExtractCheckedLocalProposal(IInvocationContext context, IProblemLocation problem, Collection<ICommandAccess> proposals) {
  CompilationUnit compilationUnit = context.getASTRoot();
  ICompilationUnit cu= (ICompilationUnit) compilationUnit.getJavaElement();

  ASTNode selectedNode= problem.getCoveringNode(compilationUnit);
  SimpleName name= findProblemFieldName(selectedNode, problem.getProblemId());
  if (name == null)
    return;
  ASTNode method= ASTNodes.getParent(selectedNode, MethodDeclaration.class);
  if (method == null)
    method= ASTNodes.getParent(selectedNode, Initializer.class);
  if (method == null)
    return;
  
  proposals.add(new ExtractToNullCheckedLocalProposal(cu, compilationUnit, name, method));
}
private static SimpleName findProblemFieldName(ASTNode selectedNode, int problemID) {

TextEditGroup group= new TextEditGroup(FixMessages.ExtractToNullCheckedLocalProposal_extractCheckedLocal_editName);
LinkedProposalPositionGroup localNameGroup= new LinkedProposalPositionGroup(LOCAL_NAME_POSITION_GROUP);
getLinkedProposalModel().addPositionGroup(localNameGroup);
VariableDeclarationStatement localDecl= ast.newVariableDeclarationStatement(localFrag);
localDecl.setType(newType(toReplace.resolveTypeBinding(), ast, imports));
localDecl.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.FINAL_KEYWORD));
String localName= proposeLocalName(this.fieldReference, this.compilationUnit, getCompilationUnit().getJavaProject());
localFrag.setName(ast.newSimpleName(localName));
String elseStatement= "// TODO "+FixMessages.ExtractToNullCheckedLocalProposal_todoHandleNullDescription; //$NON-NLS-1$
if (origStmt instanceof ReturnStatement) {
  Type returnType= newType(((ReturnStatement)origStmt).getExpression().resolveTypeBinding(), ast, imports);
  ReturnStatement returnStatement= ast.newReturnStatement();
  returnStatement.setExpression(ASTNodeFactory.newDefaultExpression(ast, returnType, 0));
  elseStatement+= '\n' + ASTNodes.asFormattedString(returnStatement, 0, String.valueOf('\n'), FormatterProfileManager.getProjectSettings(getCompilationUnit().getJavaProject()));
addLinkedPosition(rewrite.track(localFrag.getName()), true/*first*/, LOCAL_NAME_POSITION_GROUP);
addLinkedPosition(rewrite.track(nullCheck.getLeftOperand()), false, LOCAL_NAME_POSITION_GROUP);
addLinkedPosition(rewrite.track(dereferencedName), false, LOCAL_NAME_POSITION_GROUP);

ParameterizedType parameterizedType= ast.newParameterizedType(elementType);
for (ITypeBinding typeArgument : typeArguments)
  parameterizedType.typeArguments().add(newType(typeArgument, ast, imports));
elementType = parameterizedType;

TextEditGroup group= new TextEditGroup(FixMessages.ExtractToNullCheckedLocalProposal_extractCheckedLocal_editName);
LinkedProposalPositionGroup localNameGroup= new LinkedProposalPositionGroup(LOCAL_NAME_POSITION_GROUP);
getLinkedProposalModel().addPositionGroup(localNameGroup);
VariableDeclarationStatement localDecl= ast.newVariableDeclarationStatement(localFrag);
localDecl.setType(newType(toReplace.resolveTypeBinding(), ast, imports));
localDecl.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.FINAL_KEYWORD));
String localName= proposeLocalName(this.fieldReference, this.compilationUnit, getCompilationUnit().getJavaProject());
localFrag.setName(ast.newSimpleName(localName));
String elseStatement= "// TODO "+FixMessages.ExtractToNullCheckedLocalProposal_todoHandleNullDescription; //$NON-NLS-1$
if (origStmt instanceof ReturnStatement) {
  Type returnType= newType(((ReturnStatement)origStmt).getExpression().resolveTypeBinding(), ast, imports);
  ReturnStatement returnStatement= ast.newReturnStatement();
  returnStatement.setExpression(ASTNodeFactory.newDefaultExpression(ast, returnType, 0));
  elseStatement+= '\n'+ASTNodes.asFormattedString(returnStatement, 0, String.valueOf('\n'), getCompilationUnit().getJavaProject().getOptions(true));
addLinkedPosition(rewrite.track(localFrag.getName()), true/*first*/, LOCAL_NAME_POSITION_GROUP);
addLinkedPosition(rewrite.track(nullCheck.getLeftOperand()), false, LOCAL_NAME_POSITION_GROUP);
addLinkedPosition(rewrite.track(dereferencedName), false, LOCAL_NAME_POSITION_GROUP);

ParameterizedType parameterizedType= ast.newParameterizedType(elementType);
for (ITypeBinding typeArgument : typeArguments)
  parameterizedType.typeArguments().add(newType(typeArgument, ast, imports));
elementType = parameterizedType;

/**
 * Fix for {@link IProblem#NullableFieldReference}
 * @param context context
 * @param problem problem to be fixed
 * @param proposals accumulator for computed proposals
 */
public static void addExtractCheckedLocalProposal(IInvocationContext context, IProblemLocation problem, Collection<ICommandAccess> proposals) {
  CompilationUnit compilationUnit = context.getASTRoot();
  ICompilationUnit cu= (ICompilationUnit) compilationUnit.getJavaElement();

  ASTNode selectedNode= problem.getCoveringNode(compilationUnit);
  SimpleName name= findProblemFieldName(selectedNode, problem.getProblemId());
  if (name == null)
    return;
  ASTNode method= ASTNodes.getParent(selectedNode, MethodDeclaration.class);
  if (method == null)
    method= ASTNodes.getParent(selectedNode, Initializer.class);
  if (method == null)
    return;
  
  proposals.add(new ExtractToNullCheckedLocalProposal(cu, compilationUnit, name, method));
}
private static SimpleName findProblemFieldName(ASTNode selectedNode, int problemID) {

Javadoc

Fix for field related null-issues:

IProblem#NullableFieldReference
IProblem#RequiredNonNullButProvidedSpecdNullable if relating to a field
IProblem#RequiredNonNullButProvidedUnknown if relating to a field

Extract the field reference to a fresh local variable. Add a null check for that local variable and move the dereference into the then-block of this null-check:

 
 @Nullable Exception e;void test() { 
e.printStackTrace(); 
}

will be converted to:

 
 @Nullable Exception e;void test() { 
final Exception e2 = e; 
if (e2 != null) { 
e2.printStackTrace(); 
} else { 
// TODO handle null value 
} 
}

The final keyword is added to remind the user that writing to the local variable has no effect on the original field.

Rrespects scoping if the problem occurs inside the initialization of a local variable (by moving statements into the new then block).

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How to useExtractToNullCheckedLocalProposal in org.eclipse.jdt.internal.ui.text.correction.proposals

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