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Groovy: A powerful, dynamic language for the JVM
/*
* 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.TupleConstructor;
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.FieldNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.PropertyNode;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.VariableExpression;
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 java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import static org.codehaus.groovy.ast.ClassHelper.make;
import static org.codehaus.groovy.ast.ClassHelper.makeWithoutCaching;
import static org.codehaus.groovy.ast.tools.GeneralUtils.args;
import static org.codehaus.groovy.ast.tools.GeneralUtils.assignS;
import static org.codehaus.groovy.ast.tools.GeneralUtils.block;
import static org.codehaus.groovy.ast.tools.GeneralUtils.callX;
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.equalsNullX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getInstanceNonPropertyFields;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getInstancePropertyFields;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getSuperNonPropertyFields;
import static org.codehaus.groovy.ast.tools.GeneralUtils.getSuperPropertyFields;
import static org.codehaus.groovy.ast.tools.GeneralUtils.ifElseS;
import static org.codehaus.groovy.ast.tools.GeneralUtils.ifS;
import static org.codehaus.groovy.ast.tools.GeneralUtils.params;
import static org.codehaus.groovy.ast.tools.GeneralUtils.propX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.stmt;
import static org.codehaus.groovy.ast.tools.GeneralUtils.throwS;
import static org.codehaus.groovy.ast.tools.GeneralUtils.varX;
/**
* Handles generation of code for the @TupleConstructor annotation.
*
* @author Paul King
*/
@GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION)
public class TupleConstructorASTTransformation extends AbstractASTTransformation {
static final Class MY_CLASS = TupleConstructor.class;
static final ClassNode MY_TYPE = make(MY_CLASS);
static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage();
private static final ClassNode LHMAP_TYPE = makeWithoutCaching(LinkedHashMap.class, false);
private static final ClassNode HMAP_TYPE = makeWithoutCaching(HashMap.class, false);
private static final ClassNode CHECK_METHOD_TYPE = make(ImmutableASTTransformation.class);
private static Map, Expression> primitivesInitialValues;
static {
final ConstantExpression zero = constX(0);
final ConstantExpression zeroDecimal = constX(.0);
primitivesInitialValues = new HashMap, Expression>();
primitivesInitialValues.put(int.class, zero);
primitivesInitialValues.put(long.class, zero);
primitivesInitialValues.put(short.class, zero);
primitivesInitialValues.put(byte.class, zero);
primitivesInitialValues.put(char.class, zero);
primitivesInitialValues.put(float.class, zeroDecimal);
primitivesInitialValues.put(double.class, zeroDecimal);
primitivesInitialValues.put(boolean.class, ConstantExpression.FALSE);
}
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;
boolean includeFields = memberHasValue(anno, "includeFields", true);
boolean includeProperties = !memberHasValue(anno, "includeProperties", false);
boolean includeSuperFields = memberHasValue(anno, "includeSuperFields", true);
boolean includeSuperProperties = memberHasValue(anno, "includeSuperProperties", true);
boolean callSuper = memberHasValue(anno, "callSuper", true);
boolean force = memberHasValue(anno, "force", true);
List excludes = getMemberList(anno, "excludes");
List includes = getMemberList(anno, "includes");
if (hasAnnotation(cNode, CanonicalASTTransformation.MY_TYPE)) {
AnnotationNode canonical = cNode.getAnnotations(CanonicalASTTransformation.MY_TYPE).get(0);
if (excludes == null || excludes.isEmpty()) excludes = getMemberList(canonical, "excludes");
if (includes == null || includes.isEmpty()) includes = getMemberList(canonical, "includes");
}
if (!checkIncludeExclude(anno, excludes, includes, MY_TYPE_NAME)) return;
createConstructor(cNode, includeFields, includeProperties, includeSuperFields, includeSuperProperties, callSuper, force, excludes, includes);
}
}
public static void createConstructor(ClassNode cNode, boolean includeFields, boolean includeProperties, boolean includeSuperFields, boolean includeSuperProperties, boolean callSuper, boolean force, List excludes, List includes) {
// no processing if existing constructors found
List constructors = cNode.getDeclaredConstructors();
if (constructors.size() > 1 && !force) return;
boolean foundEmpty = constructors.size() == 1 && constructors.get(0).getFirstStatement() == null;
if (constructors.size() == 1 && !foundEmpty && !force) return;
// HACK: JavaStubGenerator could have snuck in a constructor we don't want
if (foundEmpty) constructors.remove(0);
List superList = new ArrayList();
if (includeSuperProperties) {
superList.addAll(getSuperPropertyFields(cNode.getSuperClass()));
}
if (includeSuperFields) {
superList.addAll(getSuperNonPropertyFields(cNode.getSuperClass()));
}
List list = new ArrayList();
if (includeProperties) {
list.addAll(getInstancePropertyFields(cNode));
}
if (includeFields) {
list.addAll(getInstanceNonPropertyFields(cNode));
}
final List params = new ArrayList();
final List superParams = new ArrayList();
final BlockStatement body = new BlockStatement();
for (FieldNode fNode : superList) {
String name = fNode.getName();
if (shouldSkip(name, excludes, includes)) continue;
params.add(createParam(fNode, name));
if (callSuper) {
superParams.add(varX(name));
} else {
body.addStatement(assignS(propX(varX("this"), name), varX(name)));
}
}
if (callSuper) {
body.addStatement(stmt(ctorX(ClassNode.SUPER, args(superParams))));
}
for (FieldNode fNode : list) {
String name = fNode.getName();
if (shouldSkip(name, excludes, includes)) continue;
Parameter nextParam = createParam(fNode, name);
params.add(nextParam);
body.addStatement(assignS(propX(varX("this"), name), varX(nextParam)));
}
cNode.addConstructor(new ConstructorNode(ACC_PUBLIC, params.toArray(new Parameter[params.size()]), ClassNode.EMPTY_ARRAY, body));
// add map constructor if needed, don't do it for LinkedHashMap for now (would lead to duplicate signature)
// or if there is only one Map property (for backwards compatibility)
if (!params.isEmpty()) {
ClassNode firstParam = params.get(0).getType();
if (params.size() > 1 || firstParam.equals(ClassHelper.OBJECT_TYPE)) {
if (firstParam.equals(ClassHelper.MAP_TYPE)) {
addMapConstructors(cNode, true, "The class " + cNode.getName() + " was incorrectly initialized via the map constructor with null.");
} else {
ClassNode candidate = HMAP_TYPE;
while (candidate != null) {
if (candidate.equals(firstParam)) {
addMapConstructors(cNode, true, "The class " + cNode.getName() + " was incorrectly initialized via the map constructor with null.");
break;
}
candidate = candidate.getSuperClass();
}
}
}
}
}
private static Parameter createParam(FieldNode fNode, String name) {
Parameter param = new Parameter(fNode.getType(), name);
param.setInitialExpression(providedOrDefaultInitialValue(fNode));
return param;
}
private static Expression providedOrDefaultInitialValue(FieldNode fNode) {
Expression initialExp = fNode.getInitialExpression() != null ? fNode.getInitialExpression() : ConstantExpression.NULL;
final ClassNode paramType = fNode.getType();
if (ClassHelper.isPrimitiveType(paramType) && initialExp.equals(ConstantExpression.NULL)) {
initialExp = primitivesInitialValues.get(paramType.getTypeClass());
}
return initialExp;
}
public static void addMapConstructors(ClassNode cNode, boolean hasNoArg, String message) {
Parameter[] parameters = params(new Parameter(LHMAP_TYPE, "__namedArgs"));
BlockStatement code = new BlockStatement();
VariableExpression namedArgs = varX("__namedArgs");
namedArgs.setAccessedVariable(parameters[0]);
code.addStatement(ifElseS(equalsNullX(namedArgs),
illegalArgumentBlock(message),
processArgsBlock(cNode, namedArgs)));
ConstructorNode init = new ConstructorNode(ACC_PUBLIC, parameters, ClassNode.EMPTY_ARRAY, code);
cNode.addConstructor(init);
// add a no-arg constructor too
if (!hasNoArg) {
code = new BlockStatement();
code.addStatement(stmt(ctorX(ClassNode.THIS, ctorX(LHMAP_TYPE))));
init = new ConstructorNode(ACC_PUBLIC, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, code);
cNode.addConstructor(init);
}
}
private static BlockStatement illegalArgumentBlock(String message) {
return block(throwS(ctorX(make(IllegalArgumentException.class), args(constX(message)))));
}
private static BlockStatement processArgsBlock(ClassNode cNode, VariableExpression namedArgs) {
BlockStatement block = new BlockStatement();
for (PropertyNode pNode : cNode.getProperties()) {
if (pNode.isStatic()) continue;
// if namedArgs.containsKey(propertyName) setProperty(propertyName, namedArgs.get(propertyName));
Statement ifStatement = ifS(
callX(namedArgs, "containsKey", constX(pNode.getName())),
assignS(varX(pNode), propX(namedArgs, pNode.getName())));
block.addStatement(ifStatement);
}
block.addStatement(stmt(callX(CHECK_METHOD_TYPE, "checkPropNames", args(varX("this"), namedArgs))));
return block;
}
}