[engine][ast]Implement Break Statement

src/main/java/com/google/api/generator/engine/ast/AstNodeVisitor.java

@@ -89,6 +89,8 @@ public interface AstNodeVisitor {
 
   public void visit(EmptyLineStatement emptyLineStatement);
 
+  public void visit(BreakStatement breakStatement);
+
   /** =============================== OTHER =============================== */
   public void visit(MethodDefinition methodDefinition);
 

src/main/java/com/google/api/generator/engine/ast/BreakStatement.java

@@ -0,0 +1,28 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.engine.ast;
+
+public class BreakStatement implements Statement {
+  private BreakStatement() {}
+
+  @Override
+  public void accept(AstNodeVisitor visitor) {
+    visitor.visit(this);
+  }
+
+  public static BreakStatement create() {
+    return new BreakStatement();
+  }
+}

src/main/java/com/google/api/generator/engine/writer/ImportWriterVisitor.java

@@ -22,6 +22,7 @@
 import com.google.api.generator.engine.ast.AstNodeVisitor;
 import com.google.api.generator.engine.ast.BlockComment;
 import com.google.api.generator.engine.ast.BlockStatement;
+import com.google.api.generator.engine.ast.BreakStatement;
 import com.google.api.generator.engine.ast.CastExpr;
 import com.google.api.generator.engine.ast.ClassDefinition;
 import com.google.api.generator.engine.ast.CommentStatement;
@@ -335,6 +336,11 @@ public void visit(EmptyLineStatement emptyLineStatement) {
     // Nothing to do.
   }
 
+  @Override
+  public void visit(BreakStatement breakStatement) {
+    // Nothing to do.
+  }
+
   /** =============================== COMMENT =============================== */
   @Override
   public void visit(LineComment lineComment) {

src/main/java/com/google/api/generator/engine/writer/JavaWriterVisitor.java

@@ -22,6 +22,7 @@
 import com.google.api.generator.engine.ast.AstNodeVisitor;
 import com.google.api.generator.engine.ast.BlockComment;
 import com.google.api.generator.engine.ast.BlockStatement;
+import com.google.api.generator.engine.ast.BreakStatement;
 import com.google.api.generator.engine.ast.CastExpr;
 import com.google.api.generator.engine.ast.ClassDefinition;
 import com.google.api.generator.engine.ast.CommentStatement;
@@ -108,6 +109,7 @@ public class JavaWriterVisitor implements AstNodeVisitor {
   private static final String TRY = "try";
   private static final String VOLATILE = "volatile";
   private static final String WHILE = "while";
+  private static final String BREAK = "break";
 
   // Operators
   private static final String OPERATOR_ADDITION = "+";
@@ -631,6 +633,12 @@ public void visit(EmptyLineStatement emptyLineStatement) {
     newline();
   }
 
+  @Override
+  public void visit(BreakStatement breakStatement) {
+    buffer.append(BREAK);
+    semicolon();
+  }
+
   /** =============================== COMMENT =============================== */
   public void visit(LineComment lineComment) {
     // Split comments by new line and add `//` to each line.

src/test/java/com/google/api/generator/engine/writer/JavaWriterVisitorTest.java

@@ -24,6 +24,7 @@
 import com.google.api.generator.engine.ast.AssignmentOperationExpr;
 import com.google.api.generator.engine.ast.BlockComment;
 import com.google.api.generator.engine.ast.BlockStatement;
+import com.google.api.generator.engine.ast.BreakStatement;
 import com.google.api.generator.engine.ast.CastExpr;
 import com.google.api.generator.engine.ast.ClassDefinition;
 import com.google.api.generator.engine.ast.CommentStatement;
@@ -2244,6 +2245,13 @@ public void writeEmptyLineStatement() {
     assertEquals("\n", writerVisitor.write());
   }
 
+  @Test
+  public void writeBreakStatement() {
+    BreakStatement statement = BreakStatement.create();
+    statement.accept(writerVisitor);
+    assertEquals("break;", writerVisitor.write());
+  }
+
   @Test
   public void writePackageInfoDefinition() {
     PackageInfoDefinition packageInfo =