| /* |
| * 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.classgen; |
| |
| import org.codehaus.groovy.ast.ClassCodeVisitorSupport; |
| import org.codehaus.groovy.ast.ClassHelper; |
| import org.codehaus.groovy.ast.ClassNode; |
| import org.codehaus.groovy.ast.CodeVisitorSupport; |
| import org.codehaus.groovy.ast.ConstructorNode; |
| import org.codehaus.groovy.ast.EnumConstantClassNode; |
| import org.codehaus.groovy.ast.InnerClassNode; |
| import org.codehaus.groovy.ast.Parameter; |
| import org.codehaus.groovy.ast.expr.ArgumentListExpression; |
| import org.codehaus.groovy.ast.expr.ConstructorCallExpression; |
| import org.codehaus.groovy.ast.expr.Expression; |
| import org.codehaus.groovy.ast.expr.TupleExpression; |
| import org.codehaus.groovy.ast.expr.VariableExpression; |
| import org.codehaus.groovy.ast.stmt.BlockStatement; |
| import org.codehaus.groovy.ast.stmt.ExpressionStatement; |
| import org.codehaus.groovy.ast.stmt.Statement; |
| import org.codehaus.groovy.control.CompilationUnit; |
| import org.codehaus.groovy.control.SourceUnit; |
| import org.codehaus.groovy.transform.TupleConstructorASTTransformation; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import static org.objectweb.asm.Opcodes.ACC_PUBLIC; |
| |
| /** |
| * Enums have a parent constructor with two arguments from java.lang.Enum. |
| * This visitor adds those two arguments into manually created constructors |
| * and performs the necessary super call. |
| */ |
| public class EnumCompletionVisitor extends ClassCodeVisitorSupport { |
| private final SourceUnit sourceUnit; |
| |
| public EnumCompletionVisitor(CompilationUnit cu, SourceUnit su) { |
| sourceUnit = su; |
| } |
| |
| public void visitClass(ClassNode node) { |
| if (!node.isEnum()) return; |
| completeEnum(node); |
| } |
| |
| protected SourceUnit getSourceUnit() { |
| return sourceUnit; |
| } |
| |
| private void completeEnum(ClassNode enumClass) { |
| boolean isAic = isAnonymousInnerClass(enumClass); |
| if (enumClass.getDeclaredConstructors().isEmpty()) { |
| addImplicitConstructors(enumClass, isAic); |
| } |
| |
| for (ConstructorNode ctor : enumClass.getDeclaredConstructors()) { |
| transformConstructor(ctor, isAic); |
| } |
| } |
| |
| /** |
| * Add map and no-arg constructor or mirror those of the superclass (i.e. base enum). |
| */ |
| private static void addImplicitConstructors(ClassNode enumClass, boolean aic) { |
| if (aic) { |
| ClassNode sn = enumClass.getSuperClass(); |
| List<ConstructorNode> sctors = new ArrayList<ConstructorNode>(sn.getDeclaredConstructors()); |
| if (sctors.isEmpty()) { |
| addMapConstructors(enumClass); |
| } else { |
| for (ConstructorNode constructorNode : sctors) { |
| ConstructorNode init = new ConstructorNode(ACC_PUBLIC, constructorNode.getParameters(), ClassNode.EMPTY_ARRAY, new BlockStatement()); |
| enumClass.addConstructor(init); |
| } |
| } |
| } else { |
| addMapConstructors(enumClass); |
| } |
| } |
| |
| /** |
| * If constructor does not define a call to super, then transform constructor |
| * to get String,int parameters at beginning and add call super(String,int). |
| */ |
| private void transformConstructor(ConstructorNode ctor, boolean isAic) { |
| boolean chainedThisConstructorCall = false; |
| ConstructorCallExpression cce = null; |
| if (ctor.firstStatementIsSpecialConstructorCall()) { |
| Statement code = ctor.getFirstStatement(); |
| cce = (ConstructorCallExpression) ((ExpressionStatement) code).getExpression(); |
| if (cce.isSuperCall()) return; |
| // must be call to this(...) |
| chainedThisConstructorCall = true; |
| } |
| // we need to add parameters |
| Parameter[] oldP = ctor.getParameters(); |
| Parameter[] newP = new Parameter[oldP.length + 2]; |
| String stringParameterName = getUniqueVariableName("__str", ctor.getCode()); |
| newP[0] = new Parameter(ClassHelper.STRING_TYPE, stringParameterName); |
| String intParameterName = getUniqueVariableName("__int", ctor.getCode()); |
| newP[1] = new Parameter(ClassHelper.int_TYPE, intParameterName); |
| System.arraycopy(oldP, 0, newP, 2, oldP.length); |
| ctor.setParameters(newP); |
| VariableExpression stringVariable = new VariableExpression(newP[0]); |
| VariableExpression intVariable = new VariableExpression(newP[1]); |
| if (chainedThisConstructorCall) { |
| TupleExpression args = (TupleExpression) cce.getArguments(); |
| List<Expression> argsExprs = args.getExpressions(); |
| argsExprs.add(0, stringVariable); |
| argsExprs.add(1, intVariable); |
| } else { |
| // add a super call |
| List<Expression> args = new ArrayList<Expression>(); |
| args.add(stringVariable); |
| args.add(intVariable); |
| if (isAic) { |
| for (Parameter parameter : oldP) { |
| args.add(new VariableExpression(parameter.getName())); |
| } |
| } |
| cce = new ConstructorCallExpression(ClassNode.SUPER, new ArgumentListExpression(args)); |
| BlockStatement code = new BlockStatement(); |
| code.addStatement(new ExpressionStatement(cce)); |
| Statement oldCode = ctor.getCode(); |
| if (oldCode != null) code.addStatement(oldCode); |
| ctor.setCode(code); |
| } |
| } |
| |
| private static void addMapConstructors(ClassNode enumClass) { |
| TupleConstructorASTTransformation.addSpecialMapConstructors(ACC_PUBLIC, enumClass, "One of the enum constants for enum " + enumClass.getName() + |
| " was initialized with null. Please use a non-null value or define your own constructor.", true); |
| } |
| |
| private String getUniqueVariableName(final String name, Statement code) { |
| if (code == null) return name; |
| final Object[] found = new Object[1]; |
| CodeVisitorSupport cv = new CodeVisitorSupport() { |
| public void visitVariableExpression(VariableExpression expression) { |
| if (expression.getName().equals(name)) found[0] = Boolean.TRUE; |
| } |
| }; |
| code.visit(cv); |
| if (found[0] != null) return getUniqueVariableName("_" + name, code); |
| return name; |
| } |
| |
| private static boolean isAnonymousInnerClass(ClassNode enumClass) { |
| if (!(enumClass instanceof EnumConstantClassNode)) return false; |
| InnerClassNode ic = (InnerClassNode) enumClass; |
| return ic.getVariableScope() == null; |
| } |
| } |