Examples of org.eclipse.jdt.core.dom.AST

org.eclipse.jdt.core.dom.AST
import declaration at end TextEdit edits = cu.rewrite(document, null); UndoEdit undo = edits.apply(document); See also {@link org.eclipse.jdt.core.dom.rewrite.ASTRewrite} foran alternative way to describe and serialize changes to a read-only AST.

Clients may create instances of this class using {@link #newAST(int)}, but this class is not intended to be subclassed.
@see ASTParser @see ASTNode @since 2.0 @noinstantiate This class is not intended to be instantiated by clients.

@Test
public class ASTTest {


  @SuppressWarnings("unchecked")
  public void stackoverflow_answer() {
    AST ast = AST.newAST(AST.JLS4);
    CompilationUnit cu = ast.newCompilationUnit();


    PackageDeclaration p1 = ast.newPackageDeclaration();
    p1.setName(ast.newSimpleName("foo"));
    cu.setPackage(p1);


    ImportDeclaration id = ast.newImportDeclaration();
    id.setName(ast.newName(new String[] {
        "java", "util", "Set" }));
    cu.imports().add(id);


    TypeDeclaration td = ast.newTypeDeclaration();
    td.setName(ast.newSimpleName("Foo"));
    TypeParameter tp = ast.newTypeParameter();
    tp.setName(ast.newSimpleName("X"));
    td.typeParameters().add(tp);
    cu.types().add(td);


    MethodDeclaration md = ast.newMethodDeclaration();
    md.modifiers().add(ast.newModifier(ModifierKeyword.PUBLIC_KEYWORD));
    md.setName(ast.newSimpleName("bar"));


    SingleVariableDeclaration var = ast.newSingleVariableDeclaration();
    var.setType(ast.newSimpleType(ast.newSimpleName("String")));
    var.setName(ast.newSimpleName("a"));
    md.parameters().add(var);
    td.bodyDeclarations().add(md);


    Block block = ast.newBlock();
    md.setBody(block);


    MethodInvocation mi = ast.newMethodInvocation();
    mi.setName(ast.newSimpleName("x"));


    ExpressionStatement e = ast.newExpressionStatement(mi);
    block.statements().add(e);


    System.out.println(cu);
  }

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   }


   private static org.eclipse.jdt.core.dom.Annotation createAnnotation(final AnnotationTargetSource<?, ?> parent,
            final AnnotationType type)
   {
      AST ast = ((ASTNode) parent.getInternal()).getAST();
      switch (type)
      {
      case MARKER:
         return ast.newMarkerAnnotation();
      case SINGLE:
         return ast.newSingleMemberAnnotation();
      case NORMAL:
         return ast.newNormalAnnotation();
      default:
         throw new IllegalArgumentException("Unknown annotation type: " + type);
      }
   }

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         {
            final String stub = "enum StubEnum { FOO() {}; }";
            final JavaEnumSource temp = Roaster.parse(JavaEnumSource.class, stub);
            final AnonymousClassDeclaration body = ((EnumConstantBodyImpl) temp.getEnumConstants().get(0).getBody())
                     .getBody();
            final AST ast = ((ASTNode) javaEnum.getInternal()).getAST();
            result = (AnonymousClassDeclaration) ASTNode.copySubtree(ast, body);
            enumConstantDeclaration.setAnonymousClassDeclaration(result);
         }
         return result;
      }

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      this.creationOccurred = false;
      return null;
    }
  }


  AST ast = this.cuAST.getAST();
  ImportDeclaration importDeclaration = ast.newImportDeclaration();
  importDeclaration.setStatic(Flags.isStatic(this.flags));
  // split import name into individual fragments, checking for on demand imports
  char[][] charFragments = CharOperation.splitOn('.', importActualName.toCharArray(), 0, importActualName.length());
  int length = charFragments.length;
  String[] strFragments = new String[length];
  for (int i = 0; i < length; i++) {
    strFragments[i] = String.valueOf(charFragments[i]);
  }
  Name name = ast.newName(strFragments);
  importDeclaration.setName(name);
  if (onDemand) importDeclaration.setOnDemand(true);
  return importDeclaration;
}

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            // we only consider potential compilation units
            ICompilationUnit cu = newFrag.getCompilationUnit(resourceName);
            if (Util.isExcluded(cu.getPath(), inclusionPatterns, exclusionPatterns, false/*not a folder*/)) continue;
            this.parser.setSource(cu);
            CompilationUnit astCU = (CompilationUnit) this.parser.createAST(this.progressMonitor);
            AST ast = astCU.getAST();
            ASTRewrite rewrite = ASTRewrite.create(ast);
            updatePackageStatement(astCU, newFragName, rewrite, cu);
            TextEdit edits = rewrite.rewriteAST();
            applyTextEdit(cu, edits);
            cu.save(null, false);

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    } else {
      // ensure cu is consistent (noop if already consistent)
      cu.makeConsistent(this.progressMonitor);
      this.parser.setSource(cu);
      CompilationUnit astCU = (CompilationUnit) this.parser.createAST(this.progressMonitor);
      AST ast = astCU.getAST();
      ASTRewrite rewrite = ASTRewrite.create(ast);
      updateTypeName(cu, astCU, cu.getElementName(), newName, rewrite);
      updatePackageStatement(astCU, destPackageName, rewrite, cu);
      return rewrite.rewriteAST();
    }

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      return rewrite.rewriteAST();
    }
  }
  private void updatePackageStatement(CompilationUnit astCU, String[] pkgName, ASTRewrite rewriter, ICompilationUnit cu) throws JavaModelException {
    boolean defaultPackage = pkgName.length == 0;
    AST ast = astCU.getAST();
    if (defaultPackage) {
      // remove existing package statement
      PackageDeclaration pkg = astCU.getPackage();
      if (pkg != null) {
        int pkgStart;
        Javadoc javadoc = pkg.getJavadoc();
        if (javadoc != null) {
          pkgStart = javadoc.getStartPosition() + javadoc.getLength() + 1;
        } else {
          pkgStart = pkg.getStartPosition();
        }
        int extendedStart = astCU.getExtendedStartPosition(pkg);
        if (pkgStart != extendedStart) {
          // keep the comments associated with package declaration
          // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=247757
          String commentSource = cu.getSource().substring(extendedStart, pkgStart);
          ASTNode comment = rewriter.createStringPlaceholder(commentSource, ASTNode.PACKAGE_DECLARATION);
          rewriter.set(astCU, CompilationUnit.PACKAGE_PROPERTY, comment, null);
        } else {
          rewriter.set(astCU, CompilationUnit.PACKAGE_PROPERTY, null, null);
        }
      }
    } else {
      org.eclipse.jdt.core.dom.PackageDeclaration pkg = astCU.getPackage();
      if (pkg != null) {
        // rename package statement
        Name name = ast.newName(pkgName);
        rewriter.set(pkg, PackageDeclaration.NAME_PROPERTY, name, null);
      } else {
        // create new package statement
        pkg = ast.newPackageDeclaration();
        pkg.setName(ast.newName(pkgName));
        rewriter.set(astCU, CompilationUnit.PACKAGE_PROPERTY, pkg, null);
      }
    }
  }

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     */
    private void updateTypeName(ICompilationUnit cu, CompilationUnit astCU, String oldName, String newName, ASTRewrite rewriter) throws JavaModelException {
      if (newName != null) {
        String oldTypeName= Util.getNameWithoutJavaLikeExtension(oldName);
        String newTypeName= Util.getNameWithoutJavaLikeExtension(newName);
        AST ast = astCU.getAST();
        // update main type name
        IType[] types = cu.getTypes();
        for (int i = 0, max = types.length; i < max; i++) {
          IType currentType = types[i];
          if (currentType.getElementName().equals(oldTypeName)) {
            AbstractTypeDeclaration typeNode = (AbstractTypeDeclaration) ((JavaElement) currentType).findNode(astCU);
            if (typeNode != null) {
              // rename type
              rewriter.replace(typeNode.getName(), ast.newSimpleName(newTypeName), null);
              // rename constructors
              Iterator bodyDeclarations = typeNode.bodyDeclarations().iterator();
              while (bodyDeclarations.hasNext()) {
                Object bodyDeclaration = bodyDeclarations.next();
                if (bodyDeclaration instanceof MethodDeclaration) {
                  MethodDeclaration methodDeclaration = (MethodDeclaration) bodyDeclaration;
                  if (methodDeclaration.isConstructor()) {
                    SimpleName methodName = methodDeclaration.getName();
                    if (methodName.getIdentifier().equals(oldTypeName)) {
                      rewriter.replace(methodName, ast.newSimpleName(newTypeName), null);
                    }
                  }
                }
              }
            }

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    this.parser.setSource(cu);
    CompilationUnit astCU = (CompilationUnit) this.parser.createAST(this.progressMonitor);
    ASTNode node = ((JavaElement) elementToRemove).findNode(astCU);
    if (node == null)
      Assert.isTrue(false, "Failed to locate " + elementToRemove.getElementName() + " in " + cu.getElementName()); //$NON-NLS-1$//$NON-NLS-2$
    AST ast = astCU.getAST();
    ASTRewrite rewriter = ASTRewrite.create(ast);
    rewriter.remove(node, null);
     TextEdit edits = rewriter.rewriteAST();
     applyTextEdit(cu, edits);
  }

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      //equivalent package declaration already exists
      this.creationOccurred = false;
      return null;
    }
  }
  AST ast = this.cuAST.getAST();
  PackageDeclaration pkgDeclaration = ast.newPackageDeclaration();
  Name astName = ast.newName(this.name);
  pkgDeclaration.setName(astName);
  return pkgDeclaration;
}

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