| /* |
| * 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.codehaus.groovy.transform; |
| |
| import groovy.transform.NullCheck; |
| import org.codehaus.groovy.ast.ASTNode; |
| import org.codehaus.groovy.ast.AnnotatedNode; |
| import org.codehaus.groovy.ast.AnnotationNode; |
| import org.codehaus.groovy.ast.ClassHelper; |
| import org.codehaus.groovy.ast.ClassNode; |
| import org.codehaus.groovy.ast.ConstructorNode; |
| import org.codehaus.groovy.ast.MethodNode; |
| import org.codehaus.groovy.ast.Parameter; |
| import org.codehaus.groovy.ast.stmt.BlockStatement; |
| import org.codehaus.groovy.ast.stmt.Statement; |
| import org.codehaus.groovy.control.CompilePhase; |
| import org.codehaus.groovy.control.SourceUnit; |
| |
| import static org.codehaus.groovy.ast.ClassHelper.make; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.constX; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.ctorX; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.ifS; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.isNullX; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.throwS; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.varX; |
| |
| /** |
| * Handles generation of code for the @AutoImplement annotation. |
| */ |
| @GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION) |
| public class NullCheckASTTransformation extends AbstractASTTransformation { |
| private static final Class MY_CLASS = NullCheck.class; |
| private static final ClassNode MY_TYPE = make(MY_CLASS); |
| private static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage(); |
| private static final ClassNode EXCEPTION = ClassHelper.make(IllegalArgumentException.class); |
| |
| @Override |
| public void visit(ASTNode[] nodes, SourceUnit source) { |
| init(nodes, source); |
| AnnotatedNode parent = (AnnotatedNode) nodes[1]; |
| AnnotationNode anno = (AnnotationNode) nodes[0]; |
| if (!MY_TYPE.equals(anno.getClassNode())) return; |
| |
| if (parent instanceof ClassNode) { |
| ClassNode cNode = (ClassNode) parent; |
| if (!checkNotInterface(cNode, MY_TYPE_NAME)) return; |
| for (ConstructorNode cn : cNode.getDeclaredConstructors()) { |
| adjustMethod(cn); |
| } |
| for (MethodNode mn : cNode.getAllDeclaredMethods()) { |
| adjustMethod(mn); |
| } |
| } else if (parent instanceof MethodNode) { |
| // handles constructor case too |
| adjustMethod((MethodNode) parent); |
| } |
| } |
| |
| private void adjustMethod(MethodNode mn) { |
| Statement origCode = mn.getCode(); |
| BlockStatement newCode = new BlockStatement(); |
| if (mn.getParameters().length == 0) return; |
| for (Parameter p : mn.getParameters()) { |
| newCode.addStatement(ifS(isNullX(varX(p)), |
| throwS(ctorX(EXCEPTION, constX(p.getName() + " cannot be null"))))); |
| } |
| if (origCode instanceof BlockStatement) { |
| for (Statement s : ((BlockStatement) origCode).getStatements()) { |
| newCode.addStatement(s); |
| } |
| } else { |
| newCode.addStatement(origCode); |
| } |
| mn.setCode(newCode); |
| } |
| } |