Question

Given that I have access to an IField field (parsed from another Java file), how do I create a FieldDeclaration in order to add it to a AST?

    String varName = field.getElementName();
    String typeName = Signature.toString(field.getTypeSignature());

    VariableDeclarationFragment fieldFrag = ast.newVariableDeclarationFragment();
    fieldFrag.setName(ast.newSimpleName(varName));
    FieldDeclaration field = ast.newFieldDeclaration(fieldFrag);
    Type fieldType = ast.newSimpleType(ast.newSimpleName(typeName));
    field.setType(fieldType);
    field.modifiers().add(ast.newModifier(modifierKeyword));

The above

Type fieldType = ast.newSimpleType(ast.newSimpleName(typeName));

only works only if typeName is not a java keyword. Is there another way to simply create a fieldDeclaration with all the IField info (modifier, type, variable)

Thanks

Answer 1

I’ve found a way using copySubtree:

    AST ast = targetCompilationUnit.getAST();

    FieldDeclaration oldFieldDeclaration = ASTNodeSearchUtil.getFieldDeclarationNode(field, sourceCompilationUnit);
    Type oldType = oldFieldDeclaration.getType();

    Type newType = (Type) ASTNode.copySubtree(ast, oldType);

Then newType can be used to plug it into a FieldDeclaration