New Annotation: FieldNameConstants.

1 files changed, 129 insertions, 0 deletions

diff --git a/src/core/lombok/eclipse/handlers/HandleFieldNameConstants.java b/src/core/lombok/eclipse/handlers/HandleFieldNameConstants.java
new file mode 100644
index 00000000..bee50f36
--- /dev/null
+++ b/src/core/lombok/eclipse/handlers/HandleFieldNameConstants.java
@@ -0,0 +1,129 @@
+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();
+	}
+	
+}