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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac.handlers;
import static lombok.javac.handlers.JavacHandlerUtil.constructorExists;
import static lombok.javac.handlers.JavacHandlerUtil.findAnnotations;
import static lombok.javac.handlers.JavacHandlerUtil.generateNullCheck;
import static lombok.javac.handlers.JavacHandlerUtil.injectMethod;
import static lombok.javac.handlers.JavacHandlerUtil.markAnnotationAsProcessed;
import static lombok.javac.handlers.JavacHandlerUtil.methodExists;
import java.lang.reflect.Modifier;
import java.util.LinkedHashMap;
import java.util.Map;
import lombok.Data;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.core.handlers.TransformationsUtil;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.handlers.JavacHandlerUtil.MemberExistsResult;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCAssign;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCModifiers;
import com.sun.tools.javac.tree.JCTree.JCReturn;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCTypeApply;
import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
/**
* Handles the {@code lombok.Data} annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
public class HandleData implements JavacAnnotationHandler<Data> {
@Override public boolean handle(AnnotationValues<Data> annotation, JCAnnotation ast, JavacNode annotationNode) {
markAnnotationAsProcessed(annotationNode, Data.class);
JavacNode typeNode = annotationNode.up();
JCClassDecl typeDecl = null;
if (typeNode.get() instanceof JCClassDecl) typeDecl = (JCClassDecl)typeNode.get();
long flags = typeDecl == null ? 0 : typeDecl.mods.flags;
boolean notAClass = (flags & (Flags.INTERFACE | Flags.ENUM | Flags.ANNOTATION)) != 0;
if (typeDecl == null || notAClass) {
annotationNode.addError("@Data is only supported on a class.");
return false;
}
List<JavacNode> nodesForConstructor = List.nil();
Map<JavacNode, Boolean> gettersAndSetters = new LinkedHashMap<JavacNode, Boolean>();
for (JavacNode child : typeNode.down()) {
if (child.getKind() != Kind.FIELD) continue;
JCVariableDecl fieldDecl = (JCVariableDecl) child.get();
//Skip fields that start with $
if (fieldDecl.name.toString().startsWith("$")) continue;
long fieldFlags = fieldDecl.mods.flags;
//Skip static fields.
if ((fieldFlags & Flags.STATIC) != 0) continue;
boolean isFinal = (fieldFlags & Flags.FINAL) != 0;
boolean isNonNull = !findAnnotations(child, TransformationsUtil.NON_NULL_PATTERN).isEmpty();
if ((isFinal || isNonNull) && fieldDecl.init == null) nodesForConstructor = nodesForConstructor.append(child);
gettersAndSetters.put(child, !isFinal);
}
String staticConstructorName = annotation.getInstance().staticConstructor();
if (constructorExists(typeNode) == MemberExistsResult.NOT_EXISTS) {
JCMethodDecl constructor = createConstructor(staticConstructorName.equals(""), typeNode, nodesForConstructor);
injectMethod(typeNode, constructor);
}
if (!staticConstructorName.isEmpty() && methodExists("of", typeNode) == MemberExistsResult.NOT_EXISTS) {
JCMethodDecl staticConstructor = createStaticConstructor(staticConstructorName, typeNode, nodesForConstructor);
injectMethod(typeNode, staticConstructor);
}
for (Map.Entry<JavacNode, Boolean> field : gettersAndSetters.entrySet()) {
new HandleGetter().generateGetterForField(field.getKey(), annotationNode.get());
if (field.getValue()) new HandleSetter().generateSetterForField(field.getKey(), annotationNode.get());
}
new HandleEqualsAndHashCode().generateEqualsAndHashCodeForType(typeNode, annotationNode);
new HandleToString().generateToStringForType(typeNode, annotationNode);
return true;
}
private JCMethodDecl createConstructor(boolean isPublic, JavacNode typeNode, List<JavacNode> fields) {
TreeMaker maker = typeNode.getTreeMaker();
JCClassDecl type = (JCClassDecl) typeNode.get();
List<JCStatement> nullChecks = List.nil();
List<JCStatement> assigns = List.nil();
List<JCVariableDecl> params = List.nil();
for (JavacNode fieldNode : fields) {
JCVariableDecl field = (JCVariableDecl) fieldNode.get();
List<JCAnnotation> nonNulls = findAnnotations(fieldNode, TransformationsUtil.NON_NULL_PATTERN);
List<JCAnnotation> nullables = findAnnotations(fieldNode, TransformationsUtil.NULLABLE_PATTERN);
JCVariableDecl param = maker.VarDef(maker.Modifiers(Flags.FINAL, nonNulls.appendList(nullables)), field.name, field.vartype, null);
params = params.append(param);
JCFieldAccess thisX = maker.Select(maker.Ident(fieldNode.toName("this")), field.name);
JCAssign assign = maker.Assign(thisX, maker.Ident(field.name));
assigns = assigns.append(maker.Exec(assign));
if (!nonNulls.isEmpty()) {
JCStatement nullCheck = generateNullCheck(maker, fieldNode);
if (nullCheck != null) nullChecks = nullChecks.append(nullCheck);
}
}
JCModifiers mods = maker.Modifiers(isPublic ? Modifier.PUBLIC : Modifier.PRIVATE);
return maker.MethodDef(mods, typeNode.toName("<init>"),
null, type.typarams, params, List.<JCExpression>nil(), maker.Block(0L, nullChecks.appendList(assigns)), null);
}
private JCMethodDecl createStaticConstructor(String name, JavacNode typeNode, List<JavacNode> fields) {
TreeMaker maker = typeNode.getTreeMaker();
JCClassDecl type = (JCClassDecl) typeNode.get();
JCModifiers mods = maker.Modifiers(Flags.STATIC | Flags.PUBLIC);
JCExpression returnType, constructorType;
List<JCTypeParameter> typeParams = List.nil();
List<JCVariableDecl> params = List.nil();
List<JCExpression> typeArgs1 = List.nil();
List<JCExpression> typeArgs2 = List.nil();
List<JCExpression> args = List.nil();
if (!type.typarams.isEmpty()) {
for (JCTypeParameter param : type.typarams) {
typeArgs1 = typeArgs1.append(maker.Ident(param.name));
typeArgs2 = typeArgs2.append(maker.Ident(param.name));
typeParams = typeParams.append(maker.TypeParameter(param.name, param.bounds));
}
returnType = maker.TypeApply(maker.Ident(type.name), typeArgs1);
constructorType = maker.TypeApply(maker.Ident(type.name), typeArgs2);
} else {
returnType = maker.Ident(type.name);
constructorType = maker.Ident(type.name);
}
for (JavacNode fieldNode : fields) {
JCVariableDecl field = (JCVariableDecl) fieldNode.get();
JCExpression pType;
if (field.vartype instanceof JCIdent) pType = maker.Ident(((JCIdent)field.vartype).name);
else if (field.vartype instanceof JCTypeApply) {
JCTypeApply typeApply = (JCTypeApply) field.vartype;
List<JCExpression> tArgs = List.nil();
for (JCExpression arg : typeApply.arguments) tArgs = tArgs.append(arg);
pType = maker.TypeApply(typeApply.clazz, tArgs);
} else {
pType = field.vartype;
}
List<JCAnnotation> nonNulls = findAnnotations(fieldNode, TransformationsUtil.NON_NULL_PATTERN);
List<JCAnnotation> nullables = findAnnotations(fieldNode, TransformationsUtil.NULLABLE_PATTERN);
JCVariableDecl param = maker.VarDef(maker.Modifiers(Flags.FINAL, nonNulls.appendList(nullables)), field.name, pType, null);
params = params.append(param);
args = args.append(maker.Ident(field.name));
}
JCReturn returnStatement = maker.Return(maker.NewClass(null, List.<JCExpression>nil(), constructorType, args, null));
JCBlock body = maker.Block(0, List.<JCStatement>of(returnStatement));
return maker.MethodDef(mods, typeNode.toName(name), returnType, typeParams, params, List.<JCExpression>nil(), body, null);
}
}
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