| /* |
| * Copyright 2008-2014 the original author or authors. |
| * |
| * Licensed 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.InheritConstructors; |
| import org.codehaus.groovy.ast.ASTNode; |
| import org.codehaus.groovy.ast.AnnotatedNode; |
| import org.codehaus.groovy.ast.AnnotationNode; |
| import org.codehaus.groovy.ast.ClassNode; |
| import org.codehaus.groovy.ast.ConstructorNode; |
| import org.codehaus.groovy.ast.Parameter; |
| import org.codehaus.groovy.ast.expr.Expression; |
| import org.codehaus.groovy.control.CompilePhase; |
| import org.codehaus.groovy.control.SourceUnit; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import static org.codehaus.groovy.ast.ClassHelper.make; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.args; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.block; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.ctorSuperS; |
| import static org.codehaus.groovy.ast.tools.GeneralUtils.varX; |
| |
| /** |
| * Handles generation of code for the {@code @}InheritConstructors annotation. |
| * |
| * @author Paul King |
| */ |
| @GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION) |
| public class InheritConstructorsASTTransformation extends AbstractASTTransformation { |
| |
| private static final Class MY_CLASS = InheritConstructors.class; |
| private static final ClassNode MY_TYPE = make(MY_CLASS); |
| private static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage(); |
| |
| public void visit(ASTNode[] nodes, SourceUnit source) { |
| init(nodes, source); |
| AnnotatedNode parent = (AnnotatedNode) nodes[1]; |
| AnnotationNode node = (AnnotationNode) nodes[0]; |
| if (!MY_TYPE.equals(node.getClassNode())) return; |
| |
| if (parent instanceof ClassNode) { |
| processClass((ClassNode) parent); |
| } |
| } |
| |
| private void processClass(ClassNode cNode) { |
| if (cNode.isInterface()) { |
| addError("Error processing interface '" + cNode.getName() + |
| "'. " + MY_TYPE_NAME + " only allowed for classes.", cNode); |
| return; |
| } |
| ClassNode sNode = cNode.getSuperClass(); |
| List<AnnotationNode> superAnnotations = sNode.getAnnotations(MY_TYPE); |
| if (superAnnotations.size() == 1) { |
| // We need @InheritConstructors from parent classes processed first |
| // so force that order here. The transformation is benign on an already |
| // processed node so processing twice in any order won't matter bar |
| // a very small time penalty. |
| processClass(sNode); |
| } |
| for (ConstructorNode cn : sNode.getDeclaredConstructors()) { |
| addConstructorUnlessAlreadyExisting(cNode, cn); |
| } |
| } |
| |
| private void addConstructorUnlessAlreadyExisting(ClassNode classNode, ConstructorNode consNode) { |
| Parameter[] origParams = consNode.getParameters(); |
| if (consNode.isPrivate()) return; |
| Parameter[] params = new Parameter[origParams.length]; |
| List<Expression> theArgs = new ArrayList<Expression>(); |
| for (int i = 0; i < origParams.length; i++) { |
| Parameter p = origParams[i]; |
| params[i] = p.hasInitialExpression() ? |
| new Parameter(p.getType(), p.getName(), p.getInitialExpression()) : |
| new Parameter(p.getType(), p.getName()); |
| theArgs.add(varX(p.getName(), p.getType())); |
| } |
| if (isExisting(classNode, params)) return; |
| classNode.addConstructor(consNode.getModifiers(), params, consNode.getExceptions(), block(ctorSuperS(args(theArgs)))); |
| } |
| |
| private boolean isExisting(ClassNode classNode, Parameter[] params) { |
| for (ConstructorNode consNode : classNode.getDeclaredConstructors()) { |
| if (matchingTypes(params, consNode.getParameters())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean matchingTypes(Parameter[] params, Parameter[] existingParams) { |
| if (params.length != existingParams.length) return false; |
| for (int i = 0; i < params.length; i++) { |
| if (!params[i].getType().equals(existingParams[i].getType())) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |