1 files changed, 138 insertions, 0 deletions
diff --git a/src/core/lombok/javac/handlers/HandleFieldNameConstants.java b/src/core/lombok/javac/handlers/HandleFieldNameConstants.java
new file mode 100644
index 00000000..45943a33
--- /dev/null
+++ b/src/core/lombok/javac/handlers/HandleFieldNameConstants.java
@@ -0,0 +1,138 @@
+package lombok.javac.handlers;
+
+import static lombok.javac.handlers.JavacHandlerUtil.*;
+
+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.javac.JavacAnnotationHandler;
+import lombok.javac.JavacNode;
+import lombok.javac.JavacTreeMaker;
+
+import org.mangosdk.spi.ProviderFor;
+
+import com.sun.tools.javac.code.Flags;
+import com.sun.tools.javac.tree.JCTree.JCAnnotation;
+import com.sun.tools.javac.tree.JCTree.JCClassDecl;
+import com.sun.tools.javac.tree.JCTree.JCExpression;
+import com.sun.tools.javac.tree.JCTree.JCModifiers;
+import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
+import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
+import com.sun.tools.javac.util.List;
+
+@ProviderFor(JavacAnnotationHandler.class) @SuppressWarnings("restriction") public class HandleFieldConstants extends JavacAnnotationHandler<FieldNameConstants> {
+	
+	public void generateFieldDefaultsForType(JavacNode typeNode, JavacNode errorNode, AccessLevel level, boolean checkForTypeLevelFieldNameConstants) {
+		
+		if (checkForTypeLevelFieldNameConstants) {
+			if (hasAnnotation(FieldNameConstants.class, typeNode)) {
+				return;
+			}
+		}
+		
+		JCClassDecl typeDecl = null;
+		if (typeNode.get() instanceof JCClassDecl) typeDecl = (JCClassDecl) typeNode.get();
+		
+		long modifiers = typeDecl == null ? 0 : typeDecl.mods.flags;
+		boolean notAClass = (modifiers & (Flags.INTERFACE | Flags.ANNOTATION)) != 0;
+		
+		if (typeDecl == null || notAClass) {
+			errorNode.addError("@FieldNameConstants is only supported on a class or an enum or a field.");
+			return;
+		}
+		
+		for (JavacNode field : typeNode.down()) {
+			if (fieldQualifiesForFieldNameConstantsGeneration(field)) generateFieldNameConstantsForField(field, errorNode.get(), level);
+			
+		}
+	}
+	
+	private void generateFieldNameConstantsForField(JavacNode fieldNode, DiagnosticPosition pos, AccessLevel level) {
+		if (hasAnnotation(FieldNameConstants.class, fieldNode)) {
+			return;
+		}
+		createFieldNameConstantsForField(level, fieldNode, fieldNode, false, List.<JCAnnotation>nil());
+	}
+	
+	private boolean fieldQualifiesForFieldNameConstantsGeneration(JavacNode field) {
+		if (field.getKind() != Kind.FIELD) return false;
+		JCVariableDecl fieldDecl = (JCVariableDecl) field.get();
+		if (fieldDecl.name.toString().startsWith("$")) return false;
+		if ((fieldDecl.mods.flags & Flags.STATIC) != 0) return false;
+		return true;
+	}
+	
+	public void handle(AnnotationValues<FieldNameConstants> annotation, JCAnnotation ast, JavacNode annotationNode) {
+		
+		Collection<JavacNode> fields = annotationNode.upFromAnnotationToFields();
+		deleteAnnotationIfNeccessary(annotationNode, FieldNameConstants.class);
+		deleteImportFromCompilationUnit(annotationNode, "lombok.AccessLevel");
+		JavacNode node = annotationNode.up();
+		FieldNameConstants annotatationInstance = annotation.getInstance();
+		AccessLevel level = annotatationInstance.level();
+		if (level == AccessLevel.NONE) {
+			annotationNode.addWarning("'lazy' does not work with AccessLevel.NONE.");
+			return;
+		}
+		if (node == null) return;
+		List<JCAnnotation> onMethod = unboxAndRemoveAnnotationParameter(ast, "onMethod", "@FieldNameConstants(onMethod=", annotationNode);
+		switch (node.getKind()) {
+		case FIELD:
+			createFieldNameConstantsForFields(level, fields, annotationNode, annotationNode, true, onMethod);
+			break;
+		case TYPE:
+			if (!onMethod.isEmpty()) {
+				annotationNode.addError("'onMethod' is not supported for @FieldNameConstants on a type.");
+			}
+			generateFieldDefaultsForType(node, annotationNode, level, false);
+			break;
+		}
+	}
+	
+	private void createFieldNameConstantsForFields(AccessLevel level, Collection<JavacNode> fieldNodes, JavacNode annotationNode, JavacNode errorNode, boolean whineIfExists, List<JCAnnotation> onMethod) {
+		for (JavacNode fieldNode : fieldNodes) {
+			createFieldNameConstantsForField(level, fieldNode, errorNode, whineIfExists, onMethod);
+		}
+	}
+	
+	private void createFieldNameConstantsForField(AccessLevel level, JavacNode fieldNode, JavacNode source, boolean whineIfExists, List<JCAnnotation> onMethod) {
+		if (fieldNode.getKind() != Kind.FIELD) {
+			source.addError("@FieldNameConstants is only supported on a class or a field");
+			return;
+		}
+		JCVariableDecl field = (JCVariableDecl) fieldNode.get();
+		String constantName = camelCaseToConstant(field.name.toString());
+		if (constantName == null) {
+			source.addWarning("Not generating constant for this field: It does not fit in your @Accessors prefix list");
+			return;
+		}
+		
+		JavacTreeMaker treeMaker = fieldNode.getTreeMaker();
+		JCModifiers modifiers = treeMaker.Modifiers(toJavacModifier(level) | Modifier.STATIC | Modifier.FINAL);
+		JCExpression returnType = chainDots(fieldNode, "java", "lang", "String");
+		JCExpression init = treeMaker.Literal(fieldNode.getName());
+		JCVariableDecl fieldConstant = treeMaker.VarDef(modifiers, fieldNode.toName(constantName), returnType, init);
+		injectField(fieldNode.up(), fieldConstant);
+	}
+	
+	public static String camelCaseToConstant(final String fieldName) {
+		if (fieldName == null || fieldName.isEmpty()) return "";
+		char[] chars = fieldName.toCharArray();
+		StringBuilder b = new StringBuilder();
+		b.append(Character.toUpperCase(chars[0]));
+		for (int i = 1, iend = chars.length; i < iend; i++) {
+			char c = chars[i];
+			if (Character.isUpperCase(c)) {
+				b.append('_');
+			} else {
+				c = Character.toUpperCase(c);
+			}
+			b.append(c);
+		}
+		return b.toString();
+	}
+}
+\ No newline at end of file