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package lombok.eclipse.handlers;
import static java.lang.Character.*;
import static lombok.eclipse.handlers.EclipseHandlerUtil.*;
import java.lang.reflect.Modifier;
import java.util.Collection;
import lombok.AccessLevel;
import lombok.FieldNameConstants;
import lombok.core.AST.Kind;
import lombok.core.AnnotationValues;
import lombok.eclipse.Eclipse;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.StringLiteral;
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;
@ProviderFor(EclipseAnnotationHandler.class) public class HandleFieldNameConstants extends EclipseAnnotationHandler<FieldNameConstants> {
public boolean generateFieldDefaultsForType(EclipseNode typeNode, EclipseNode errorNode, AccessLevel level, boolean checkForTypeLevelFieldNameConstants) {
if (checkForTypeLevelFieldNameConstants) {
if (hasAnnotation(FieldNameConstants.class, typeNode)) {
return true;
}
}
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)) != 0;
if (typeDecl == null || notAClass) {
errorNode.addError("@FieldNameConstants is only supported on a class or an enum or a field.");
return false;
}
for (EclipseNode field : typeNode.down()) {
if (fieldQualifiesForFieldNameConstantsGeneration(field)) generateFieldNameConstantsForField(field, errorNode.get(), level);
if (field.getKind() != Kind.FIELD) return false;
}
return true;
}
private void generateFieldNameConstantsForField(EclipseNode fieldNode, ASTNode pos, AccessLevel level) {
if (hasAnnotation(FieldNameConstants.class, fieldNode)) {
return;
}
createFieldNameConstantsForField(level, fieldNode, fieldNode, pos, false);
}
private void createFieldNameConstantsForField(AccessLevel level, EclipseNode fieldNode, EclipseNode errorNode, ASTNode source, boolean whineIfExists) {
if (fieldNode.getKind() != Kind.FIELD) {
errorNode.addError("@FieldNameConstants is only supported on a class or a field");
return;
}
FieldDeclaration field = (FieldDeclaration) fieldNode.get();
String constantName = camelCaseToConstant(new String(field.name));
if (constantName == null) {
errorNode.addWarning("Not generating constant for this field: It does not fit in your @Accessors prefix list");
return;
}
int pS = source.sourceStart, pE = source.sourceEnd;
long p = (long) pS << 32 | pE;
FieldDeclaration fieldConstant = new FieldDeclaration(constantName.toCharArray(), pS,pE);
fieldConstant.bits |= Eclipse.ECLIPSE_DO_NOT_TOUCH_FLAG;
fieldConstant.modifiers = toEclipseModifier(level) | Modifier.STATIC | Modifier.FINAL;
fieldConstant.type = new QualifiedTypeReference(TypeConstants.JAVA_LANG_STRING, new long[]{p,p,p});
fieldConstant.initialization = new StringLiteral(field.name, pS,pE,0);
injectField(fieldNode.up(), fieldConstant);
}
private boolean fieldQualifiesForFieldNameConstantsGeneration(EclipseNode field) {
if (field.getKind() != Kind.FIELD) return false;
FieldDeclaration fieldDecl = (FieldDeclaration) field.get();
return filterField(fieldDecl);
}
public void handle(AnnotationValues<FieldNameConstants> annotation, Annotation ast, EclipseNode annotationNode) {
EclipseNode node = annotationNode.up();
FieldNameConstants annotatationInstance = annotation.getInstance();
AccessLevel level = annotatationInstance.level();
if (node == null) return;
switch (node.getKind()){
case FIELD:
createFieldNameConstantsForFields(level, annotationNode.upFromAnnotationToFields(), annotationNode, annotationNode.get(), true);
break;
case TYPE:
generateFieldDefaultsForType(node, annotationNode, level, false);
break;
}
}
private void createFieldNameConstantsForFields(AccessLevel level, Collection<EclipseNode> fieldNodes, EclipseNode errorNode, ASTNode source, boolean whineIfExists) {
for (EclipseNode fieldNode : fieldNodes){
createFieldNameConstantsForField(level, fieldNode, errorNode, source, whineIfExists);
}
}
public static String camelCaseToConstant(final String fieldName) {
if (fieldName == null || fieldName.isEmpty()) return "";
char[] chars = fieldName.toCharArray();
StringBuilder b = new StringBuilder();
b.append(toUpperCase(chars[0]));
for (int i = 1, iend = chars.length; i < iend; i++) {
char c = chars[i];
if (isUpperCase(c)) {
b.append('_');
} else {
c = toUpperCase(c);
}
b.append(c);
}
return b.toString();
}
}
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