| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.drill.exec.expr.fn; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.codehaus.janino.Java; |
| import org.codehaus.janino.Java.AbstractCompilationUnit.SingleStaticImportDeclaration; |
| import org.codehaus.janino.Java.AbstractCompilationUnit.SingleTypeImportDeclaration; |
| import org.codehaus.janino.Java.AbstractCompilationUnit.StaticImportOnDemandDeclaration; |
| import org.codehaus.janino.Java.AbstractCompilationUnit.TypeImportOnDemandDeclaration; |
| import org.codehaus.janino.util.AbstractTraverser; |
| |
| public class ImportGrabber { |
| |
| private final List<String> imports = new ArrayList<>(); |
| private final ImportFinder importFinder = new ImportFinder(); |
| |
| private ImportGrabber() { |
| } |
| |
| /** |
| * Creates list of imports that are present in compilation unit. |
| * For example: |
| * [import io.netty.buffer.DrillBuf;, import org.apache.drill.exec.expr.DrillSimpleFunc;] |
| * |
| * @param compilationUnit compilation unit |
| * @return list of imports |
| */ |
| public static List<String> getImports(Java.CompilationUnit compilationUnit) { |
| ImportGrabber visitor = new ImportGrabber(); |
| Arrays.stream(compilationUnit.importDeclarations).forEach(visitor.importFinder::visitImportDeclaration); |
| |
| return visitor.imports; |
| } |
| |
| public class ImportFinder extends AbstractTraverser<RuntimeException> { |
| |
| @Override |
| public void traverseSingleTypeImportDeclaration(SingleTypeImportDeclaration stid) { |
| imports.add(stid.toString()); |
| } |
| |
| @Override |
| public void traverseSingleStaticImportDeclaration(SingleStaticImportDeclaration stid) { |
| imports.add(stid.toString()); |
| } |
| |
| @Override |
| public void traverseTypeImportOnDemandDeclaration(TypeImportOnDemandDeclaration tiodd) { |
| imports.add(tiodd.toString()); |
| } |
| |
| @Override |
| public void traverseStaticImportOnDemandDeclaration(StaticImportOnDemandDeclaration siodd) { |
| imports.add(siodd.toString()); |
| } |
| } |
| |
| } |