Merge branch 'builderUpdate'

6 files changed, 214 insertions, 61 deletions

diff --git a/src/core/lombok/javac/handlers/singulars/JavacGuavaMapSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacGuavaMapSingularizer.java
index 0700e2e5..e0621cf7 100644
--- a/src/core/lombok/javac/handlers/singulars/JavacGuavaMapSingularizer.java
+++ b/src/core/lombok/javac/handlers/singulars/JavacGuavaMapSingularizer.java
@@ -32,14 +32,27 @@ public class JavacGuavaMapSingularizer extends JavacGuavaSingularizer {
 	// TODO cgcc.ImmutableClassToInstanceMap
 	// TODO cgcc.ImmutableRangeMap
 	
+	private static final LombokImmutableList<String> SUFFIXES =
+		LombokImmutableList.of("key", "value");
+	private static final LombokImmutableList<String> SUPPORTED_TYPES = LombokImmutableList.of(
+		"com.google.common.collect.ImmutableMap", 
+		"com.google.common.collect.ImmutableBiMap", 
+		"com.google.common.collect.ImmutableSortedMap"
+	);
+	
 	@Override public LombokImmutableList<String> getSupportedTypes() {
-		return LombokImmutableList.of(
-				"com.google.common.collect.ImmutableMap", 
-				"com.google.common.collect.ImmutableBiMap", 
-				"com.google.common.collect.ImmutableSortedMap");
+		return SUPPORTED_TYPES;
+	}
+	
+	@Override protected LombokImmutableList<String> getArgumentSuffixes() {
+		return SUFFIXES;
+	}
+	
+	@Override protected String getAddMethodName() {
+		return "put";
 	}
 	
-	@Override protected boolean isMap() {
-		return true;
+	@Override protected String getAddAllTypeName() {
+		return "java.util.Map";
 	}
 }
diff --git a/src/core/lombok/javac/handlers/singulars/JavacGuavaSetListSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacGuavaSetListSingularizer.java
index 2e404ca8..5c7fcab5 100644
--- a/src/core/lombok/javac/handlers/singulars/JavacGuavaSetListSingularizer.java
+++ b/src/core/lombok/javac/handlers/singulars/JavacGuavaSetListSingularizer.java
@@ -1,16 +1,16 @@
 /*
  * Copyright (C) 2015 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
@@ -21,25 +21,36 @@
  */
 package lombok.javac.handlers.singulars;
 
+import org.mangosdk.spi.ProviderFor;
+
 import lombok.core.LombokImmutableList;
 import lombok.javac.handlers.JavacSingularsRecipes.JavacSingularizer;
 
-import org.mangosdk.spi.ProviderFor;
-
 @ProviderFor(JavacSingularizer.class)
 public class JavacGuavaSetListSingularizer extends JavacGuavaSingularizer {
-	// TODO com.google.common.collect.ImmutableTable
 	// TODO com.google.common.collect.ImmutableRangeSet
 	// TODO com.google.common.collect.ImmutableMultiset and com.google.common.collect.ImmutableSortedMultiset
+	private static final LombokImmutableList<String> SUFFIXES = LombokImmutableList.of("");
+	private static final LombokImmutableList<String> SUPPORTED_TYPES = LombokImmutableList.of(
+		"com.google.common.collect.ImmutableCollection", 
+		"com.google.common.collect.ImmutableList", 
+		"com.google.common.collect.ImmutableSet", 
+		"com.google.common.collect.ImmutableSortedSet"
+	);
+	
 	@Override public LombokImmutableList<String> getSupportedTypes() {
-		return LombokImmutableList.of(
-				"com.google.common.collect.ImmutableCollection", 
-				"com.google.common.collect.ImmutableList", 
-				"com.google.common.collect.ImmutableSet", 
-				"com.google.common.collect.ImmutableSortedSet");
+		return SUPPORTED_TYPES;
+	}
+	
+	@Override protected LombokImmutableList<String> getArgumentSuffixes() {
+		return SUFFIXES;
+	}
+	
+	@Override protected String getAddMethodName() {
+		return "add";
 	}
 	
-	@Override protected boolean isMap() {
-		return false;
+	@Override protected String getAddAllTypeName() {
+		return "java.lang.Iterable";
 	}
 }
diff --git a/src/core/lombok/javac/handlers/singulars/JavacGuavaSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacGuavaSingularizer.java
index 41e379f6..4de39d98 100644
--- a/src/core/lombok/javac/handlers/singulars/JavacGuavaSingularizer.java
+++ b/src/core/lombok/javac/handlers/singulars/JavacGuavaSingularizer.java
@@ -1,16 +1,16 @@
 /*
  * Copyright (C) 2015 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
@@ -27,6 +27,7 @@ import static lombok.javac.handlers.JavacHandlerUtil.*;
 import java.util.Collections;
 
 import lombok.core.GuavaTypeMap;
+import lombok.core.LombokImmutableList;
 import lombok.core.handlers.HandlerUtil;
 import lombok.javac.JavacNode;
 import lombok.javac.JavacTreeMaker;
@@ -58,12 +59,11 @@ abstract class JavacGuavaSingularizer extends JavacSingularizer {
 		return "builder";
 	}
 	
-	protected abstract boolean isMap();
-	
 	@Override public java.util.List<JavacNode> generateFields(SingularData data, JavacNode builderType, JCTree source) {
 		JavacTreeMaker maker = builderType.getTreeMaker();
-		JCExpression type = JavacHandlerUtil.chainDots(builderType, "com", "google", "common", "collect", getSimpleTargetTypeName(data), "Builder");
-		type = addTypeArgs(isMap() ? 2 : 1, false, builderType, type, data.getTypeArgs(), source);
+		String simpleTypeName = getSimpleTargetTypeName(data);
+		JCExpression type = JavacHandlerUtil.chainDots(builderType, "com", "google", "common", "collect", simpleTypeName, "Builder");
+		type = addTypeArgs(getTypeArgumentsCount(), false, builderType, type, data.getTypeArgs(), source);
 		
 		JCVariableDecl buildField = maker.VarDef(maker.Modifiers(Flags.PRIVATE), data.getPluralName(), type, null);
 		return Collections.singletonList(injectFieldAndMarkGenerated(builderType, buildField));
@@ -74,75 +74,94 @@ abstract class JavacGuavaSingularizer extends JavacSingularizer {
 		JCExpression returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
 		JCStatement returnStatement = chain ? maker.Return(maker.Ident(builderType.toName("this"))) : null;
 		generateSingularMethod(maker, returnType, returnStatement, data, builderType, source, fluent);
-		
+
 		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
 		returnStatement = chain ? maker.Return(maker.Ident(builderType.toName("this"))) : null;
 		generatePluralMethod(maker, returnType, returnStatement, data, builderType, source, fluent);
+		
+		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
+		returnStatement = chain ? maker.Return(maker.Ident(builderType.toName("this"))) : null;
+		generateClearMethod(maker, returnType, returnStatement, data, builderType, source);
+	}
+	
+	private void generateClearMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source) {
+		JCModifiers mods = maker.Modifiers(Flags.PUBLIC);
+		List<JCTypeParameter> typeParams = List.nil();
+		List<JCExpression> thrown = List.nil();
+		List<JCVariableDecl> params = List.nil();
+		
+		JCExpression thisDotField = maker.Select(maker.Ident(builderType.toName("this")), data.getPluralName());
+		JCStatement clearField = maker.Exec(maker.Assign(thisDotField, maker.Literal(CTC_BOT, null)));
+		List<JCStatement> statements = returnStatement != null ? List.of(clearField, returnStatement) : List.of(clearField);
+		
+		JCBlock body = maker.Block(0, statements);
+		Name methodName = builderType.toName(HandlerUtil.buildAccessorName("clear", data.getPluralName().toString()));
+		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, params, thrown, body, null);
+		injectMethod(builderType, method);
 	}
 	
 	void generateSingularMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source, boolean fluent) {
 		List<JCTypeParameter> typeParams = List.nil();
 		List<JCExpression> thrown = List.nil();
-		boolean mapMode = isMap();
 		
-		Name keyName = !mapMode ? data.getSingularName() : builderType.toName(data.getSingularName() + "$key");
-		Name valueName = !mapMode ? null : builderType.toName(data.getSingularName() + "$value");
+		LombokImmutableList<String> suffixes = getArgumentSuffixes();
+		Name[] names = new Name[suffixes.size()];
+		for (int i = 0; i < suffixes.size(); i++) {
+			String s = suffixes.get(i);
+			Name n = data.getSingularName();
+			names[i] = s.isEmpty() ? n : builderType.toName(s);
+		}
 		
 		JCModifiers mods = maker.Modifiers(Flags.PUBLIC);
 		ListBuffer<JCStatement> statements = new ListBuffer<JCStatement>();
-		statements.append(createConstructBuilderVarIfNeeded(maker, data, builderType, mapMode, source));
-		JCExpression thisDotFieldDotAdd = chainDots(builderType, "this", data.getPluralName().toString(), mapMode ? "put" : "add");
-		List<JCExpression> invokeAddExpr;
-		if (mapMode) {
-			invokeAddExpr = List.<JCExpression>of(maker.Ident(keyName), maker.Ident(valueName));
-		} else {
-			invokeAddExpr = List.<JCExpression>of(maker.Ident(keyName));
+		statements.append(createConstructBuilderVarIfNeeded(maker, data, builderType, source));
+		JCExpression thisDotFieldDotAdd = chainDots(builderType, "this", data.getPluralName().toString(), getAddMethodName());
+		ListBuffer<JCExpression> invokeAddExprBuilder = new ListBuffer<JCExpression>();
+		for (int i = 0; i < suffixes.size(); i++) {
+			invokeAddExprBuilder.append(maker.Ident(names[i]));
 		}
+		List<JCExpression> invokeAddExpr = invokeAddExprBuilder.toList();
 		JCExpression invokeAdd = maker.Apply(List.<JCExpression>nil(), thisDotFieldDotAdd, invokeAddExpr);
 		statements.append(maker.Exec(invokeAdd));
 		if (returnStatement != null) statements.append(returnStatement);
 		JCBlock body = maker.Block(0, statements.toList());
 		Name methodName = data.getSingularName();
 		long paramFlags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, builderType.getContext());
-		if (!fluent) methodName = builderType.toName(HandlerUtil.buildAccessorName(mapMode ? "put" : "add", methodName.toString()));
-		List<JCVariableDecl> params;
-		if (mapMode) {
-			JCExpression keyType = cloneParamType(0, maker, data.getTypeArgs(), builderType, source);
-			JCExpression valueType = cloneParamType(1, maker, data.getTypeArgs(), builderType, source);
-			JCVariableDecl paramKey = maker.VarDef(maker.Modifiers(paramFlags), keyName, keyType, null);
-			JCVariableDecl paramValue = maker.VarDef(maker.Modifiers(paramFlags), valueName, valueType, null);
-			params = List.of(paramKey, paramValue);
-		} else {
-			JCExpression paramType = cloneParamType(0, maker, data.getTypeArgs(), builderType, source);
-			params = List.of(maker.VarDef(maker.Modifiers(paramFlags), data.getSingularName(), paramType, null));
+		if (!fluent) methodName = builderType.toName(HandlerUtil.buildAccessorName(getAddMethodName(), methodName.toString()));
+		ListBuffer<JCVariableDecl> params = new ListBuffer<JCVariableDecl>();
+		for (int i = 0; i < suffixes.size(); i++) {
+			JCExpression pt = cloneParamType(i, maker, data.getTypeArgs(), builderType, source);
+			JCVariableDecl p = maker.VarDef(maker.Modifiers(paramFlags), names[i], pt, null);
+			params.append(p);
 		}
-		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, params, thrown, body, null);
+		
+		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, params.toList(), thrown, body, null);
 		injectMethod(builderType, method);
 	}
 	
 	protected void generatePluralMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source, boolean fluent) {
 		List<JCTypeParameter> typeParams = List.nil();
 		List<JCExpression> thrown = List.nil();
-		boolean mapMode = isMap();
 		
 		JCModifiers mods = maker.Modifiers(Flags.PUBLIC);
 		ListBuffer<JCStatement> statements = new ListBuffer<JCStatement>();
-		statements.append(createConstructBuilderVarIfNeeded(maker, data, builderType, mapMode, source));
-		JCExpression thisDotFieldDotAddAll = chainDots(builderType, "this", data.getPluralName().toString(), mapMode ? "putAll" : "addAll");
+		statements.append(createConstructBuilderVarIfNeeded(maker, data, builderType, source));
+		JCExpression thisDotFieldDotAddAll = chainDots(builderType, "this", data.getPluralName().toString(), getAddMethodName() + "All");
 		JCExpression invokeAddAll = maker.Apply(List.<JCExpression>nil(), thisDotFieldDotAddAll, List.<JCExpression>of(maker.Ident(data.getPluralName())));
 		statements.append(maker.Exec(invokeAddAll));
 		if (returnStatement != null) statements.append(returnStatement);
 		JCBlock body = maker.Block(0, statements.toList());
 		Name methodName = data.getPluralName();
 		long paramFlags = JavacHandlerUtil.addFinalIfNeeded(Flags.PARAMETER, builderType.getContext());
-		if (!fluent) methodName = builderType.toName(HandlerUtil.buildAccessorName(mapMode ? "putAll" : "addAll", methodName.toString()));
+		if (!fluent) methodName = builderType.toName(HandlerUtil.buildAccessorName(getAddMethodName() + "All", methodName.toString()));
 		JCExpression paramType;
-		if (mapMode) {
-			paramType = chainDots(builderType, "java", "util", "Map");
+		String aaTypeName = getAddAllTypeName();
+		if (aaTypeName.startsWith("java.lang.") && aaTypeName.indexOf('.', 11) == -1) {
+			paramType = genJavaLangTypeRef(builderType, aaTypeName.substring(10));
 		} else {
-			paramType = genJavaLangTypeRef(builderType, "Iterable");
+			paramType = chainDotsString(builderType, aaTypeName);
 		}
-		paramType = addTypeArgs(mapMode ? 2 : 1, true, builderType, paramType, data.getTypeArgs(), source);
+		paramType = addTypeArgs(getTypeArgumentsCount(), true, builderType, paramType, data.getTypeArgs(), source);
 		JCVariableDecl param = maker.VarDef(maker.Modifiers(paramFlags), data.getPluralName(), paramType, null);
 		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, List.of(param), thrown, body, null);
 		injectMethod(builderType, method);
@@ -151,15 +170,15 @@ abstract class JavacGuavaSingularizer extends JavacSingularizer {
 	@Override public void appendBuildCode(SingularData data, JavacNode builderType, JCTree source, ListBuffer<JCStatement> statements, Name targetVariableName) {
 		JavacTreeMaker maker = builderType.getTreeMaker();
 		List<JCExpression> jceBlank = List.nil();
-		boolean mapMode = isMap();
 		
 		JCExpression varType = chainDotsString(builderType, data.getTargetFqn());
-		varType = addTypeArgs(mapMode ? 2 : 1, false, builderType, varType, data.getTypeArgs(), source);
+		int agrumentsCount = getTypeArgumentsCount();
+		varType = addTypeArgs(agrumentsCount, false, builderType, varType, data.getTypeArgs(), source);
 		
 		JCExpression empty; {
 			//ImmutableX.of()
 			JCExpression emptyMethod = chainDots(builderType, "com", "google", "common", "collect", getSimpleTargetTypeName(data), "of");
-			List<JCExpression> invokeTypeArgs = createTypeArgs(mapMode ? 2 : 1, false, builderType, data.getTypeArgs(), source);
+			List<JCExpression> invokeTypeArgs = createTypeArgs(agrumentsCount, false, builderType, data.getTypeArgs(), source);
 			empty = maker.Apply(invokeTypeArgs, emptyMethod, jceBlank);
 		}
 		
@@ -179,7 +198,7 @@ abstract class JavacGuavaSingularizer extends JavacSingularizer {
 		statements.append(jcs);
 	}
 	
-	protected JCStatement createConstructBuilderVarIfNeeded(JavacTreeMaker maker, SingularData data, JavacNode builderType, boolean mapMode, JCTree source) {
+	protected JCStatement createConstructBuilderVarIfNeeded(JavacTreeMaker maker, SingularData data, JavacNode builderType, JCTree source) {
 		List<JCExpression> jceBlank = List.nil();
 		
 		JCExpression thisDotField = maker.Select(maker.Ident(builderType.toName("this")), data.getPluralName());
@@ -191,4 +210,12 @@ abstract class JavacGuavaSingularizer extends JavacSingularizer {
 		
 		return maker.If(cond, thenPart, null);
 	}
+	
+	protected abstract LombokImmutableList<String> getArgumentSuffixes();
+	protected abstract String getAddMethodName();
+	protected abstract String getAddAllTypeName();
+	
+	protected int getTypeArgumentsCount() {
+		return getArgumentSuffixes().size();
+	}
 }
diff --git a/src/core/lombok/javac/handlers/singulars/JavacGuavaTableSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacGuavaTableSingularizer.java
new file mode 100644
index 00000000..080266b8
--- /dev/null
+++ b/src/core/lombok/javac/handlers/singulars/JavacGuavaTableSingularizer.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 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.singulars;
+
+import org.mangosdk.spi.ProviderFor;
+
+import lombok.core.LombokImmutableList;
+import lombok.javac.handlers.JavacSingularsRecipes.JavacSingularizer;
+
+@ProviderFor(JavacSingularizer.class)
+public class JavacGuavaTableSingularizer extends JavacGuavaSingularizer {
+	private static final LombokImmutableList<String> SUFFIXES =
+		LombokImmutableList.of("rowKey", "columnKey", "value");
+	private static final LombokImmutableList<String> SUPPORTED_TYPES =
+		LombokImmutableList.of("com.google.common.collect.ImmutableTable");
+	
+	@Override public LombokImmutableList<String> getSupportedTypes() {
+		return SUPPORTED_TYPES;
+	}
+	
+	@Override protected LombokImmutableList<String> getArgumentSuffixes() {
+		return SUFFIXES;
+	}
+	
+	@Override protected String getAddMethodName() {
+		return "put";
+	}
+	
+	@Override protected String getAddAllTypeName() {
+		return "com.google.common.collect.Table";
+	}
+}
diff --git a/src/core/lombok/javac/handlers/singulars/JavacJavaUtilListSetSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacJavaUtilListSetSingularizer.java
index 8574ddbf..e167c7e2 100644
--- a/src/core/lombok/javac/handlers/singulars/JavacJavaUtilListSetSingularizer.java
+++ b/src/core/lombok/javac/handlers/singulars/JavacJavaUtilListSetSingularizer.java
@@ -91,6 +91,30 @@ abstract class JavacJavaUtilListSetSingularizer extends JavacJavaUtilSingularize
 		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
 		returnStatement = chain ? maker.Return(maker.Ident(thisName)) : null;
 		generatePluralMethod(maker, returnType, returnStatement, data, builderType, source, fluent);
+		
+		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
+		returnStatement = chain ? maker.Return(maker.Ident(thisName)) : null;
+		generateClearMethod(maker, returnType, returnStatement, data, builderType, source);
+	}
+	
+	private void generateClearMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source) {
+		JCModifiers mods = maker.Modifiers(Flags.PUBLIC);
+		List<JCTypeParameter> typeParams = List.nil();
+		List<JCExpression> thrown = List.nil();
+		List<JCVariableDecl> params = List.nil();
+		List<JCExpression> jceBlank = List.nil();
+		
+		JCExpression thisDotField = maker.Select(maker.Ident(builderType.toName("this")), data.getPluralName());
+		JCExpression thisDotFieldDotClear = maker.Select(maker.Select(maker.Ident(builderType.toName("this")), data.getPluralName()), builderType.toName("clear"));
+		JCStatement clearCall = maker.Exec(maker.Apply(jceBlank, thisDotFieldDotClear, jceBlank));
+		JCExpression cond = maker.Binary(CTC_NOT_EQUAL, thisDotField, maker.Literal(CTC_BOT, null));
+		JCStatement ifSetCallClear = maker.If(cond, clearCall, null);
+		List<JCStatement> statements = returnStatement != null ? List.of(ifSetCallClear, returnStatement) : List.of(ifSetCallClear);
+		
+		JCBlock body = maker.Block(0, statements);
+		Name methodName = builderType.toName(HandlerUtil.buildAccessorName("clear", data.getPluralName().toString()));
+		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, params, thrown, body, null);
+		injectMethod(builderType, method);
 	}
 	
 	void generateSingularMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source, boolean fluent) {
diff --git a/src/core/lombok/javac/handlers/singulars/JavacJavaUtilMapSingularizer.java b/src/core/lombok/javac/handlers/singulars/JavacJavaUtilMapSingularizer.java
index 0830c9c9..1acae7e3 100644
--- a/src/core/lombok/javac/handlers/singulars/JavacJavaUtilMapSingularizer.java
+++ b/src/core/lombok/javac/handlers/singulars/JavacJavaUtilMapSingularizer.java
@@ -115,6 +115,33 @@ public class JavacJavaUtilMapSingularizer extends JavacJavaUtilSingularizer {
 		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
 		returnStatement = chain ? maker.Return(maker.Ident(builderType.toName("this"))) : null;
 		generatePluralMethod(maker, returnType, returnStatement, data, builderType, source, fluent);
+		
+		returnType = chain ? cloneSelfType(builderType) : maker.Type(createVoidType(maker, CTC_VOID));
+		returnStatement = chain ? maker.Return(maker.Ident(builderType.toName("this"))) : null;
+		generateClearMethod(maker, returnType, returnStatement, data, builderType, source);
+	}
+	
+	private void generateClearMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source) {
+		JCModifiers mods = maker.Modifiers(Flags.PUBLIC);
+		List<JCTypeParameter> typeParams = List.nil();
+		List<JCExpression> thrown = List.nil();
+		List<JCVariableDecl> params = List.nil();
+		List<JCExpression> jceBlank = List.nil();
+		
+		JCExpression thisDotKeyField = chainDots(builderType, "this", data.getPluralName() + "$key");
+		JCExpression thisDotKeyFieldDotClear = chainDots(builderType, "this", data.getPluralName() + "$key", "clear");
+		JCExpression thisDotValueFieldDotClear = chainDots(builderType, "this", data.getPluralName() + "$value", "clear");
+		JCStatement clearKeyCall = maker.Exec(maker.Apply(jceBlank, thisDotKeyFieldDotClear, jceBlank));
+		JCStatement clearValueCall = maker.Exec(maker.Apply(jceBlank, thisDotValueFieldDotClear, jceBlank));
+		JCExpression cond = maker.Binary(CTC_NOT_EQUAL, thisDotKeyField, maker.Literal(CTC_BOT, null));
+		JCBlock clearCalls = maker.Block(0, List.of(clearKeyCall, clearValueCall));
+		JCStatement ifSetCallClear = maker.If(cond, clearCalls, null);
+		List<JCStatement> statements = returnStatement != null ? List.of(ifSetCallClear, returnStatement) : List.of(ifSetCallClear);
+		
+		JCBlock body = maker.Block(0, statements);
+		Name methodName = builderType.toName(HandlerUtil.buildAccessorName("clear", data.getPluralName().toString()));
+		JCMethodDecl method = maker.MethodDef(mods, methodName, returnType, typeParams, params, thrown, body, null);
+		injectMethod(builderType, method);
 	}
 	
 	private void generateSingularMethod(JavacTreeMaker maker, JCExpression returnType, JCStatement returnStatement, SingularData data, JavacNode builderType, JCTree source, boolean fluent) {