private RefactoringStatus checkExpression() throws JavaModelException {
RefactoringStatus result = new RefactoringStatus();
result.merge(checkExpressionBinding());
if (result.hasFatalError()) return result;
checkAllStaticFinal();
IExpressionFragment selectedExpression = getSelectedExpression();
Expression associatedExpression = selectedExpression.getAssociatedExpression();
if (associatedExpression instanceof NullLiteral)
result.merge(
RefactoringStatus.createFatalErrorStatus(
RefactoringCoreMessages.ExtractConstantRefactoring_null_literals));
else if (!ConstantChecks.isLoadTimeConstant(selectedExpression))
result.merge(
RefactoringStatus.createFatalErrorStatus(
RefactoringCoreMessages.ExtractConstantRefactoring_not_load_time_constant));
else if (associatedExpression instanceof SimpleName) {
if (associatedExpression.getParent() instanceof QualifiedName
&& associatedExpression.getLocationInParent() == QualifiedName.NAME_PROPERTY
|| associatedExpression.getParent() instanceof FieldAccess
&& associatedExpression.getLocationInParent() == FieldAccess.NAME_PROPERTY)
return RefactoringStatus.createFatalErrorStatus(
RefactoringCoreMessages.ExtractConstantRefactoring_select_expression);
}
return result;
}
private Type getConstantType() throws JavaModelException {
if (fConstantTypeCache == null) {
IExpressionFragment fragment = getSelectedExpression();
ITypeBinding typeBinding = guessBindingForReference(fragment.getAssociatedExpression());
AST ast = fCuRewrite.getAST();
typeBinding = Bindings.normalizeForDeclarationUse(typeBinding, ast);
ImportRewrite importRewrite = fCuRewrite.getImportRewrite();
ImportRewriteContext context =
new ContextSensitiveImportRewriteContext(
fCuRewrite.getRoot(), fSelectionStart, importRewrite);
fConstantTypeCache = importRewrite.addImport(typeBinding, ast, context);
}
return fConstantTypeCache;
}
private String[] getExcludedVariableNames() {
if (fExcludedVariableNames == null) {
try {
IExpressionFragment expr = getSelectedExpression();
Collection<String> takenNames =
new ScopeAnalyzer(fCuRewrite.getRoot())
.getUsedVariableNames(expr.getStartPosition(), expr.getLength());
fExcludedVariableNames = takenNames.toArray(new String[takenNames.size()]);
} catch (JavaModelException e) {
fExcludedVariableNames = new String[0];
}
}
return fExcludedVariableNames;
}
/* bd is a static field declaration or static initializer */
private static boolean depends(IExpressionFragment selected, BodyDeclaration bd) {
/* We currently consider selected to depend on bd only if db includes a declaration
* of a static field on which selected depends.
*
* A more accurate strategy might be to also check if bd contains (or is) a
* static initializer containing code which changes the value of a static field on
* which selected depends. However, if a static is written to multiple times within
* during class initialization, it is difficult to predict which value should be used.
* This would depend on which value is used by expressions instances for which the new
* constant will be substituted, and there may be many of these; in each, the
* static field in question may have taken on a different value (if some of these uses
* occur within static initializers).
*/
if (bd instanceof FieldDeclaration) {
FieldDeclaration fieldDecl = (FieldDeclaration) bd;
for (Iterator<VariableDeclarationFragment> fragments = fieldDecl.fragments().iterator();
fragments.hasNext(); ) {
VariableDeclarationFragment fragment = fragments.next();
SimpleName staticFieldName = fragment.getName();
if (selected.getSubFragmentsMatching(
ASTFragmentFactory.createFragmentForFullSubtree(staticFieldName))
.length
!= 0) return true;
}
}
return false;
}
// !!! -- same as in ExtractTempRefactoring
private boolean isLiteralNodeSelected() throws JavaModelException {
IExpressionFragment fragment = getSelectedExpression();
if (fragment == null) return false;
Expression expression = fragment.getAssociatedExpression();
if (expression == null) return false;
switch (expression.getNodeType()) {
case ASTNode.BOOLEAN_LITERAL:
case ASTNode.CHARACTER_LITERAL:
case ASTNode.NULL_LITERAL:
case ASTNode.NUMBER_LITERAL:
return true;
default:
return false;
}
}
private IExpressionFragment getSelectedExpression() throws JavaModelException {
if (fSelectedExpression != null) return fSelectedExpression;
IASTFragment selectedFragment =
ASTFragmentFactory.createFragmentForSourceRange(
new SourceRange(fSelectionStart, fSelectionLength), fCuRewrite.getRoot(), fCu);
if (selectedFragment instanceof IExpressionFragment
&& !Checks.isInsideJavadoc(selectedFragment.getAssociatedNode())) {
fSelectedExpression = (IExpressionFragment) selectedFragment;
}
if (fSelectedExpression != null
&& Checks.isEnumCase(fSelectedExpression.getAssociatedExpression().getParent())) {
fSelectedExpression = null;
}
return fSelectedExpression;
}
private ExtractConstantDescriptor createRefactoringDescriptor() {
final Map<String, String> arguments = new HashMap<>();
String project = null;
IJavaProject javaProject = fCu.getJavaProject();
if (javaProject != null) project = javaProject.getElementName();
int flags =
JavaRefactoringDescriptor.JAR_REFACTORING | JavaRefactoringDescriptor.JAR_SOURCE_ATTACHMENT;
if (JdtFlags.getVisibilityCode(fVisibility) != Modifier.PRIVATE)
flags |= RefactoringDescriptor.STRUCTURAL_CHANGE;
final String expression = ASTNodes.asString(fSelectedExpression.getAssociatedExpression());
final String description =
Messages.format(
RefactoringCoreMessages.ExtractConstantRefactoring_descriptor_description_short,
BasicElementLabels.getJavaElementName(fConstantName));
final String header =
Messages.format(
RefactoringCoreMessages.ExtractConstantRefactoring_descriptor_description,
new String[] {
BasicElementLabels.getJavaElementName(fConstantName),
BasicElementLabels.getJavaCodeString(expression)
});
final JDTRefactoringDescriptorComment comment =
new JDTRefactoringDescriptorComment(project, this, header);
comment.addSetting(
Messages.format(
RefactoringCoreMessages.ExtractConstantRefactoring_constant_name_pattern,
BasicElementLabels.getJavaElementName(fConstantName)));
comment.addSetting(
Messages.format(
RefactoringCoreMessages.ExtractConstantRefactoring_constant_expression_pattern,
BasicElementLabels.getJavaCodeString(expression)));
String visibility = fVisibility;
if ("".equals(visibility)) // $NON-NLS-1$
visibility = RefactoringCoreMessages.ExtractConstantRefactoring_default_visibility;
comment.addSetting(
Messages.format(
RefactoringCoreMessages.ExtractConstantRefactoring_visibility_pattern, visibility));
if (fReplaceAllOccurrences)
comment.addSetting(RefactoringCoreMessages.ExtractConstantRefactoring_replace_occurrences);
if (fQualifyReferencesWithDeclaringClassName)
comment.addSetting(RefactoringCoreMessages.ExtractConstantRefactoring_qualify_references);
arguments.put(
JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT,
JavaRefactoringDescriptorUtil.elementToHandle(project, fCu));
arguments.put(JavaRefactoringDescriptorUtil.ATTRIBUTE_NAME, fConstantName);
arguments.put(
JavaRefactoringDescriptorUtil.ATTRIBUTE_SELECTION,
new Integer(fSelectionStart).toString()
+ " "
+ new Integer(fSelectionLength).toString()); // $NON-NLS-1$
arguments.put(ATTRIBUTE_REPLACE, Boolean.valueOf(fReplaceAllOccurrences).toString());
arguments.put(
ATTRIBUTE_QUALIFY, Boolean.valueOf(fQualifyReferencesWithDeclaringClassName).toString());
arguments.put(
ATTRIBUTE_VISIBILITY, new Integer(JdtFlags.getVisibilityCode(fVisibility)).toString());
ExtractConstantDescriptor descriptor =
RefactoringSignatureDescriptorFactory.createExtractConstantDescriptor(
project, description, comment.asString(), arguments, flags);
return descriptor;
}
private void createConstantDeclaration() throws CoreException {
Type type = getConstantType();
IExpressionFragment fragment = getSelectedExpression();
Expression initializer =
getSelectedExpression().createCopyTarget(fCuRewrite.getASTRewrite(), true);
AST ast = fCuRewrite.getAST();
VariableDeclarationFragment variableDeclarationFragment = ast.newVariableDeclarationFragment();
variableDeclarationFragment.setName(ast.newSimpleName(fConstantName));
variableDeclarationFragment.setInitializer(initializer);
FieldDeclaration fieldDeclaration = ast.newFieldDeclaration(variableDeclarationFragment);
fieldDeclaration.setType(type);
Modifier.ModifierKeyword accessModifier = Modifier.ModifierKeyword.toKeyword(fVisibility);
if (accessModifier != null) fieldDeclaration.modifiers().add(ast.newModifier(accessModifier));
fieldDeclaration.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.STATIC_KEYWORD));
fieldDeclaration.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.FINAL_KEYWORD));
boolean createComments =
JavaPreferencesSettings.getCodeGenerationSettings(fCu.getJavaProject()).createComments;
if (createComments) {
String comment =
CodeGeneration.getFieldComment(
fCu, getConstantTypeName(), fConstantName, StubUtility.getLineDelimiterUsed(fCu));
if (comment != null && comment.length() > 0) {
Javadoc doc =
(Javadoc) fCuRewrite.getASTRewrite().createStringPlaceholder(comment, ASTNode.JAVADOC);
fieldDeclaration.setJavadoc(doc);
}
}
AbstractTypeDeclaration parent = getContainingTypeDeclarationNode();
ListRewrite listRewrite =
fCuRewrite.getASTRewrite().getListRewrite(parent, parent.getBodyDeclarationsProperty());
TextEditGroup msg =
fCuRewrite.createGroupDescription(
RefactoringCoreMessages.ExtractConstantRefactoring_declare_constant);
if (insertFirst()) {
listRewrite.insertFirst(fieldDeclaration, msg);
} else {
listRewrite.insertAfter(fieldDeclaration, getNodeToInsertConstantDeclarationAfter(), msg);
}
if (fLinkedProposalModel != null) {
ASTRewrite rewrite = fCuRewrite.getASTRewrite();
LinkedProposalPositionGroup nameGroup = fLinkedProposalModel.getPositionGroup(KEY_NAME, true);
nameGroup.addPosition(rewrite.track(variableDeclarationFragment.getName()), true);
String[] nameSuggestions = guessConstantNames();
if (nameSuggestions.length > 0 && !nameSuggestions[0].equals(fConstantName)) {
nameGroup.addProposal(fConstantName, null, nameSuggestions.length + 1);
}
for (int i = 0; i < nameSuggestions.length; i++) {
nameGroup.addProposal(nameSuggestions[i], null, nameSuggestions.length - i);
}
LinkedProposalPositionGroup typeGroup = fLinkedProposalModel.getPositionGroup(KEY_TYPE, true);
typeGroup.addPosition(rewrite.track(type), true);
ITypeBinding typeBinding = guessBindingForReference(fragment.getAssociatedExpression());
if (typeBinding != null) {
ITypeBinding[] relaxingTypes = ASTResolving.getNarrowingTypes(ast, typeBinding);
for (int i = 0; i < relaxingTypes.length; i++) {
typeGroup.addProposal(relaxingTypes[i], fCuRewrite.getCu(), relaxingTypes.length - i);
}
}
boolean isInterface =
parent.resolveBinding() != null && parent.resolveBinding().isInterface();
ModifierCorrectionSubProcessor.installLinkedVisibilityProposals(
fLinkedProposalModel, rewrite, fieldDeclaration.modifiers(), isInterface);
}
}