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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.eclipse.handlers;
import static lombok.eclipse.handlers.PKG.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import lombok.AccessLevel;
import lombok.ToString;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.eclipse.Eclipse;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseAST.Node;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.BinaryExpression;
import org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MarkerAnnotation;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.NameReference;
import org.eclipse.jdt.internal.compiler.ast.OperatorIds;
import org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.ReturnStatement;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.StringLiteral;
import org.eclipse.jdt.internal.compiler.ast.SuperReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.mangosdk.spi.ProviderFor;
/**
* Handles the <code>ToString</code> annotation for eclipse.
*/
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleToString implements EclipseAnnotationHandler<ToString> {
private void checkForBogusExcludes(Node type, AnnotationValues<ToString> annotation) {
List<String> list = Arrays.asList(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 ( (((FieldDeclaration)child.get()).modifiers & ClassFileConstants.AccStatic) != 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);
}
}
}
public void generateToStringForType(Node typeNode, Node errorNode) {
for ( Node child : typeNode.down() ) {
if ( child.getKind() == Kind.ANNOTATION ) {
if ( Eclipse.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, Collections.<String>emptyList(), includeFieldNames, callSuper, false);
}
public boolean handle(AnnotationValues<ToString> annotation, Annotation ast, Node annotationNode) {
ToString ann = annotation.getInstance();
List<String> excludes = Arrays.asList(ann.exclude());
Node typeNode = annotationNode.up();
checkForBogusExcludes(typeNode, annotation);
return generateToString(typeNode, annotationNode, excludes, ann.includeFieldNames(), ann.callSuper(), true);
}
public boolean generateToString(Node typeNode, Node errorNode, List<String> excludes,
boolean includeFieldNames, boolean callSuper, boolean whineIfExists) {
TypeDeclaration typeDecl = null;
if ( typeNode.get() instanceof TypeDeclaration ) typeDecl = (TypeDeclaration) typeNode.get();
int modifiers = typeDecl == null ? 0 : typeDecl.modifiers;
boolean notAClass = (modifiers &
(ClassFileConstants.AccInterface | ClassFileConstants.AccAnnotation | ClassFileConstants.AccEnum)) != 0;
if ( typeDecl == null || notAClass ) {
errorNode.addError("@ToString is only supported on a class.");
return false;
}
List<Node> nodesForToString = new ArrayList<Node>();
for ( Node child : typeNode.down() ) {
if ( child.getKind() != Kind.FIELD ) continue;
FieldDeclaration fieldDecl = (FieldDeclaration) child.get();
//Skip static fields.
if ( (fieldDecl.modifiers & ClassFileConstants.AccStatic) != 0 ) continue;
//Skip excluded fields.
if ( excludes.contains(new String(fieldDecl.name)) ) continue;
nodesForToString.add(child);
}
switch ( methodExists("toString", typeNode) ) {
case NOT_EXISTS:
MethodDeclaration toString = createToString(typeNode, nodesForToString, includeFieldNames, callSuper, errorNode.get());
injectMethod(typeNode, toString);
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 MethodDeclaration createToString(Node type, Collection<Node> fields, boolean includeFieldNames, boolean callSuper, ASTNode pos) {
TypeDeclaration typeDeclaration = (TypeDeclaration)type.get();
char[] rawTypeName = typeDeclaration.name;
String typeName = rawTypeName == null ? "" : new String(rawTypeName);
char[] suffix = ")".toCharArray();
String infixS = ", ";
char[] infix = infixS.toCharArray();
long p = (long)pos.sourceStart << 32 | pos.sourceEnd;
final int PLUS = OperatorIds.PLUS;
char[] prefix;
if ( callSuper ) {
prefix = (typeName + "(super=").toCharArray();
} else if ( fields.isEmpty() ) {
prefix = (typeName + "()").toCharArray();
} else if ( includeFieldNames ) {
prefix = (typeName + "(" + new String(((FieldDeclaration)fields.iterator().next().get()).name) + "=").toCharArray();
} else {
prefix = (typeName + "(").toCharArray();
}
boolean first = true;
Expression current = new StringLiteral(prefix, 0, 0, 0);
if ( callSuper ) {
MessageSend callToSuper = new MessageSend();
callToSuper.receiver = new SuperReference(0, 0);
callToSuper.selector = "toString".toCharArray();
current = new BinaryExpression(current, callToSuper, PLUS);
first = false;
}
for ( Node field : fields ) {
FieldDeclaration f = (FieldDeclaration)field.get();
if ( f.name == null || f.type == null ) continue;
Expression ex;
if ( f.type.dimensions() > 0 ) {
MessageSend arrayToString = new MessageSend();
arrayToString.receiver = generateQualifiedNameRef(TypeConstants.JAVA, TypeConstants.UTIL, "Arrays".toCharArray());
arrayToString.arguments = new Expression[] { new SingleNameReference(f.name, p) };
if ( f.type.dimensions() > 1 || !BUILT_IN_TYPES.contains(new String(f.type.getLastToken())) ) {
arrayToString.selector = "deepToString".toCharArray();
} else {
arrayToString.selector = "toString".toCharArray();
}
ex = arrayToString;
} else ex = new SingleNameReference(f.name, p);
if ( first ) {
current = new BinaryExpression(current, ex, PLUS);
first = false;
continue;
}
if ( includeFieldNames ) {
char[] namePlusEqualsSign = (infixS + new String(f.name) + "=").toCharArray();
current = new BinaryExpression(current, new StringLiteral(namePlusEqualsSign, 0, 0, 0), PLUS);
} else {
current = new BinaryExpression(current, new StringLiteral(infix, 0, 0, 0), PLUS);
}
current = new BinaryExpression(current, ex, PLUS);
}
if ( !first ) current = new BinaryExpression(current, new StringLiteral(suffix, 0, 0, 0), PLUS);
ReturnStatement returnStatement = new ReturnStatement(current, (int)(p >> 32), (int)p);
MethodDeclaration method = new MethodDeclaration(((CompilationUnitDeclaration) type.top().get()).compilationResult);
method.modifiers = PKG.toModifier(AccessLevel.PUBLIC);
method.returnType = new QualifiedTypeReference(TypeConstants.JAVA_LANG_STRING, new long[] {0, 0, 0});
MarkerAnnotation overrideAnnotation = new MarkerAnnotation(new QualifiedTypeReference(TypeConstants.JAVA_LANG_OVERRIDE, new long[] {p, p, p}), (int)(p >> 32));
overrideAnnotation.declarationSourceEnd = overrideAnnotation.sourceEnd = overrideAnnotation.statementEnd = (int)p;
overrideAnnotation.bits |= ASTNode.HasBeenGenerated;
method.annotations = new Annotation[] {overrideAnnotation};
method.arguments = null;
method.selector = "toString".toCharArray();
method.thrownExceptions = null;
method.typeParameters = null;
method.bits |= Eclipse.ECLIPSE_DO_NOT_TOUCH_FLAG;
method.bodyStart = method.declarationSourceStart = method.sourceStart = pos.sourceStart;
method.bodyEnd = method.declarationSourceEnd = method.sourceEnd = pos.sourceEnd;
method.statements = new Statement[] { returnStatement };
return method;
}
private static final Set<String> BUILT_IN_TYPES = Collections.unmodifiableSet(new HashSet<String>(Arrays.asList(
"byte", "short", "int", "long", "char", "boolean", "double", "float")));
private NameReference generateQualifiedNameRef(char[]... varNames) {
if ( varNames.length > 1 )
return new QualifiedNameReference(varNames, new long[varNames.length], 0, 0);
else return new SingleNameReference(varNames[0], 0);
}
}
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