1 files changed, 131 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..089d225d
--- /dev/null
+++ b/src/core/lombok/javac/handlers/HandleFieldNameConstants.java
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2014-2018 The Project Lombok Authors.
+ * 
+ * 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.core.handlers.HandlerUtil.handleExperimentalFlagUsage;
+import static lombok.javac.handlers.JavacHandlerUtil.*;
+
+import java.lang.reflect.Modifier;
+import java.util.Collection;
+
+import lombok.AccessLevel;
+import lombok.ConfigurationKeys;
+import lombok.core.AST.Kind;
+import lombok.core.handlers.HandlerUtil;
+import lombok.core.AnnotationValues;
+import lombok.experimental.FieldNameConstants;
+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;
+
+@ProviderFor(JavacAnnotationHandler.class)
+public class HandleFieldNameConstants extends JavacAnnotationHandler<FieldNameConstants> {
+	public void generateFieldNameConstantsForType(JavacNode typeNode, JavacNode errorNode, AccessLevel level) {
+		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, 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);
+	}
+	
+	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) {
+		handleExperimentalFlagUsage(annotationNode, ConfigurationKeys.FIELD_NAME_CONSTANTS_FLAG_USAGE, "@FieldNameConstants");
+		
+		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 (node == null) return;
+		switch (node.getKind()) {
+		case FIELD:
+			if (level != AccessLevel.NONE) createFieldNameConstantsForFields(level, fields, annotationNode, annotationNode, true);
+			break;
+		case TYPE:
+			if (level == AccessLevel.NONE) {
+				annotationNode.addWarning("type-level '@FieldNameConstants' does not work with AccessLevel.NONE.");
+				return;
+			}
+			generateFieldNameConstantsForType(node, annotationNode, level);
+			break;
+		}
+	}
+	
+	private void createFieldNameConstantsForFields(AccessLevel level, Collection<JavacNode> fieldNodes, JavacNode annotationNode, JavacNode errorNode, boolean whineIfExists) {
+		for (JavacNode fieldNode : fieldNodes) createFieldNameConstantsForField(level, fieldNode, errorNode, whineIfExists);
+	}
+	
+	private void createFieldNameConstantsForField(AccessLevel level, JavacNode fieldNode, JavacNode source, boolean whineIfExists) {
+		if (fieldNode.getKind() != Kind.FIELD) {
+			source.addError("@FieldNameConstants is only supported on a class, an enum, or a field");
+			return;
+		}
+		
+		JCVariableDecl field = (JCVariableDecl) fieldNode.get();
+		String fieldName = field.name.toString();
+		String constantName = HandlerUtil.camelCaseToConstant(fieldName);
+		if (constantName.equals(fieldName)) {
+			fieldNode.addWarning("Not generating constant for this field: The name of the constant would be equal to the name of this field.");
+			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);
+	}
+}
+\ No newline at end of file