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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.PKG.*;
import lombok.ToString;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.javac.Javac;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacAST.Node;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCArrayTypeTree;
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.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
import com.sun.tools.javac.tree.JCTree.JCModifiers;
import com.sun.tools.javac.tree.JCTree.JCPrimitiveTypeTree;
import com.sun.tools.javac.tree.JCTree.JCStatement;
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>ToString</code> annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
public class HandleToString implements JavacAnnotationHandler<ToString> {
private void checkForBogusExcludes(Node type, AnnotationValues<ToString> annotation) {
List<String> list = List.from(annotation.getInstance().exclude());
boolean[] matched = new boolean[list.size()];
for ( Node child : type.down() ) {
if ( list.isEmpty() ) break;
if ( child.getKind() != Kind.FIELD ) continue;
if ( (((JCVariableDecl)child.get()).mods.flags & Flags.STATIC) != 0 ) continue;
int idx = list.indexOf(child.getName());
if ( idx > -1 ) matched[idx] = true;
}
for ( int i = 0 ; i < list.size() ; i++ ) {
if ( !matched[i] ) {
annotation.setWarning("exclude", "This field does not exist, or would have been excluded anyway.", i);
}
}
}
@Override public boolean handle(AnnotationValues<ToString> annotation, JCAnnotation ast, Node annotationNode) {
ToString ann = annotation.getInstance();
List<String> excludes = List.from(ann.exclude());
Node typeNode = annotationNode.up();
checkForBogusExcludes(typeNode, annotation);
return generateToString(typeNode, annotationNode, excludes, ann.includeFieldNames(), ann.callSuper(), true);
}
public void generateToStringForType(Node typeNode, Node errorNode) {
for ( Node child : typeNode.down() ) {
if ( child.getKind() == Kind.ANNOTATION ) {
if ( Javac.annotationTypeMatches(ToString.class, child) ) {
//The annotation will make it happen, so we can skip it.
return;
}
}
}
boolean includeFieldNames = false;
boolean callSuper = false;
try {
includeFieldNames = ((Boolean)ToString.class.getMethod("includeFieldNames").getDefaultValue()).booleanValue();
} catch ( Exception ignore ) {}
try {
callSuper = ((Boolean)ToString.class.getMethod("callSuper").getDefaultValue()).booleanValue();
} catch ( Exception ignore ) {}
generateToString(typeNode, errorNode, List.<String>nil(), includeFieldNames, callSuper, false);
}
private boolean generateToString(Node typeNode, Node errorNode, List<String> excludes,
boolean includeFieldNames, boolean callSuper, boolean whineIfExists) {
boolean notAClass = true;
if ( typeNode.get() instanceof JCClassDecl ) {
long flags = ((JCClassDecl)typeNode.get()).mods.flags;
notAClass = (flags & (Flags.INTERFACE | Flags.ANNOTATION | Flags.ENUM)) != 0;
}
if ( notAClass ) {
errorNode.addError("@ToString is only supported on a class.");
return false;
}
List<Node> nodesForToString = List.nil();
for ( Node child : typeNode.down() ) {
if ( child.getKind() != Kind.FIELD ) continue;
JCVariableDecl fieldDecl = (JCVariableDecl) child.get();
//Skip static fields.
if ( (fieldDecl.mods.flags & Flags.STATIC) != 0 ) continue;
//Skip excluded fields.
if ( excludes.contains(fieldDecl.name.toString()) ) continue;
nodesForToString = nodesForToString.append(child);
}
switch ( methodExists("toString", typeNode) ) {
case NOT_EXISTS:
JCMethodDecl method = createToString(typeNode, nodesForToString, includeFieldNames, callSuper);
injectMethod(typeNode, method);
return true;
case EXISTS_BY_LOMBOK:
return true;
default:
case EXISTS_BY_USER:
if ( whineIfExists ) {
errorNode.addWarning("Not generating toString(): A method with that name already exists");
}
return true;
}
}
private JCMethodDecl createToString(Node typeNode, List<Node> fields, boolean includeFieldNames, boolean callSuper) {
TreeMaker maker = typeNode.getTreeMaker();
JCAnnotation overrideAnnotation = maker.Annotation(chainDots(maker, typeNode, "java", "lang", "Override"), List.<JCExpression>nil());
JCModifiers mods = maker.Modifiers(Flags.PUBLIC, List.of(overrideAnnotation));
JCExpression returnType = chainDots(maker, typeNode, "java", "lang", "String");
boolean first = true;
String typeName = ((JCClassDecl) typeNode.get()).name.toString();
String infix = ", ";
String suffix = ")";
String prefix;
if ( callSuper ) {
prefix = typeName + "(super=";
} else if ( fields.isEmpty() ) {
prefix = typeName + "()";
} else if ( includeFieldNames ) {
prefix = typeName + "(" + ((JCVariableDecl)fields.iterator().next().get()).name.toString() + "=";
} else {
prefix = typeName + "(";
}
JCExpression current = maker.Literal(prefix);
if ( callSuper ) {
JCMethodInvocation callToSuper = maker.Apply(List.<JCExpression>nil(),
maker.Select(maker.Ident(typeNode.toName("super")), typeNode.toName("toString")),
List.<JCExpression>nil());
current = maker.Binary(JCTree.PLUS, current, callToSuper);
first = false;
}
for ( Node fieldNode : fields ) {
JCVariableDecl field = (JCVariableDecl) fieldNode.get();
JCExpression expr;
if ( field.vartype instanceof JCArrayTypeTree ) {
boolean multiDim = ((JCArrayTypeTree)field.vartype).elemtype instanceof JCArrayTypeTree;
boolean primitiveArray = ((JCArrayTypeTree)field.vartype).elemtype instanceof JCPrimitiveTypeTree;
boolean useDeepTS = multiDim || !primitiveArray;
JCExpression hcMethod = chainDots(maker, typeNode, "java", "util", "Arrays", useDeepTS ? "deepToString" : "toString");
expr = maker.Apply(List.<JCExpression>nil(), hcMethod, List.<JCExpression>of(maker.Ident(field.name)));
} else expr = maker.Ident(field.name);
if ( first ) {
current = maker.Binary(JCTree.PLUS, current, expr);
first = false;
continue;
}
if ( includeFieldNames ) {
current = maker.Binary(JCTree.PLUS, current, maker.Literal(infix + fieldNode.getName() + "="));
} else {
current = maker.Binary(JCTree.PLUS, current, maker.Literal(infix));
}
current = maker.Binary(JCTree.PLUS, current, expr);
}
if ( !first ) current = maker.Binary(JCTree.PLUS, current, maker.Literal(suffix));
JCStatement returnStatement = maker.Return(current);
JCBlock body = maker.Block(0, List.of(returnStatement));
return maker.MethodDef(mods, typeNode.toName("toString"), returnType,
List.<JCTypeParameter>nil(), List.<JCVariableDecl>nil(), List.<JCExpression>nil(), body, null);
}
}
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