| /* |
| * 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.apache.groovy.ast.tools.ConstructorNodeUtils; |
| 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.expr.ConstantExpression; |
| import org.codehaus.groovy.ast.expr.ConstructorCallExpression; |
| import org.codehaus.groovy.ast.expr.Expression; |
| import org.codehaus.groovy.ast.stmt.BlockStatement; |
| import org.codehaus.groovy.ast.stmt.ThrowStatement; |
| import org.codehaus.groovy.classgen.BytecodeSequence; |
| import org.codehaus.groovy.control.CompilePhase; |
| import org.codehaus.groovy.control.SourceUnit; |
| |
| import java.util.List; |
| |
| import static org.apache.groovy.ast.tools.AnnotatedNodeUtils.isGenerated; |
| import static org.apache.groovy.ast.tools.MethodNodeUtils.getCodeAsBlock; |
| 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.param; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.params; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.throwS; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.varX; |
| import static org.codehaus.groovy.transform.stc.StaticTypesMarker.DIRECT_METHOD_CALL_TARGET; |
| |
| /** |
| * Handles generation of code for the @NullCheck annotation. |
| */ |
| @GroovyASTTransformation(phase = CompilePhase.INSTRUCTION_SELECTION) |
| public class NullCheckASTTransformation extends AbstractASTTransformation { |
| public static final ClassNode NULL_CHECK_TYPE = ClassHelper.make(NullCheck.class); |
| private static final String NULL_CHECK_NAME = "@" + NULL_CHECK_TYPE.getNameWithoutPackage(); |
| private static final ClassNode EXCEPTION = ClassHelper.make(IllegalArgumentException.class); |
| private static final ConstructorNode EXCEPTION_STRING_CTOR = EXCEPTION.getDeclaredConstructor(params(param(ClassHelper.STRING_TYPE, "s"))); |
| private static final String NULL_CHECK_IS_PROCESSED = "NullCheck.isProcessed"; |
| |
| @Override |
| public void visit(ASTNode[] nodes, SourceUnit source) { |
| init(nodes, source); |
| AnnotatedNode parent = (AnnotatedNode) nodes[1]; |
| AnnotationNode anno = (AnnotationNode) nodes[0]; |
| if (!NULL_CHECK_TYPE.equals(anno.getClassNode())) return; |
| boolean includeGenerated = isIncludeGenerated(anno); |
| |
| if (parent instanceof ClassNode) { |
| ClassNode cNode = (ClassNode) parent; |
| if (!checkNotInterface(cNode, NULL_CHECK_NAME)) return; |
| for (ConstructorNode cn : cNode.getDeclaredConstructors()) { |
| adjustMethod(cn, includeGenerated); |
| } |
| for (MethodNode mn : cNode.getAllDeclaredMethods()) { |
| adjustMethod(mn, includeGenerated); |
| } |
| } else if (parent instanceof MethodNode) { |
| // handles constructor case too |
| adjustMethod((MethodNode) parent, false); |
| } |
| } |
| |
| private boolean isIncludeGenerated(AnnotationNode anno) { |
| return memberHasValue(anno, "includeGenerated", true); |
| } |
| |
| public static boolean hasIncludeGenerated(ClassNode cNode) { |
| List<AnnotationNode> annotations = cNode.getAnnotations(NULL_CHECK_TYPE); |
| if (annotations.isEmpty()) return false; |
| return hasIncludeGenerated(annotations.get(0)); |
| } |
| |
| private static boolean hasIncludeGenerated(AnnotationNode node) { |
| final Expression member = node.getMember("includeGenerated"); |
| return member instanceof ConstantExpression && ((ConstantExpression) member).getValue().equals(true); |
| } |
| |
| private void adjustMethod(MethodNode mn, boolean includeGenerated) { |
| BlockStatement newCode = getCodeAsBlock(mn); |
| if (mn.getParameters().length == 0) return; |
| boolean generated = isGenerated(mn); |
| int startingIndex = 0; |
| if (!includeGenerated && generated) return; |
| if (isMarkedAsProcessed(mn)) return; |
| if (mn instanceof ConstructorNode) { |
| // some transform has been here already and we assume it knows what it is doing |
| if (mn.getFirstStatement() instanceof BytecodeSequence) return; |
| // ignore any constructors calling this(...) or super(...) |
| ConstructorCallExpression cce = ConstructorNodeUtils.getFirstIfSpecialConstructorCall(mn.getCode()); |
| if (cce != null) { |
| if (generated) { |
| return; |
| } else { |
| startingIndex = 1; // skip over this/super() call |
| } |
| } |
| } |
| for (Parameter p : mn.getParameters()) { |
| if (ClassHelper.isPrimitiveType(p.getType())) continue; |
| newCode.getStatements().add(startingIndex, ifS(isNullX(varX(p)), makeThrowStmt(p.getName()))); |
| } |
| mn.setCode(newCode); |
| } |
| |
| public static ThrowStatement makeThrowStmt(final String variableName) { |
| ConstructorCallExpression newException = ctorX(EXCEPTION, constX(variableName + " cannot be null")); |
| newException.putNodeMetaData(DIRECT_METHOD_CALL_TARGET, EXCEPTION_STRING_CTOR); // GROOVY-10178 |
| return throwS(newException); |
| } |
| |
| /** |
| * Mark a method as already processed. |
| * |
| * @param mn the method node to be considered already processed |
| */ |
| public static void markAsProcessed(MethodNode mn) { |
| mn.setNodeMetaData(NULL_CHECK_IS_PROCESSED, Boolean.TRUE); |
| } |
| |
| private static boolean isMarkedAsProcessed(MethodNode mn) { |
| Boolean r = mn.getNodeMetaData(NULL_CHECK_IS_PROCESSED); |
| return null != r && r; |
| } |
| } |