Initial support for mixins in dartc.

compiler/java/com/google/dart/compiler/ast/DartClassTypeAlias.java

Index: compiler/java/com/google/dart/compiler/ast/DartClassTypeAlias.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartClassTypeAlias.java b/compiler/java/com/google/dart/compiler/ast/DartClassTypeAlias.java
new file mode 100644
index 0000000000000000000000000000000000000000..b9fa309f5f6169e9cf9774c7b5605265a62cad76
--- /dev/null
+++ b/compiler/java/com/google/dart/compiler/ast/DartClassTypeAlias.java
@@ -0,0 +1,88 @@
+// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.google.dart.compiler.ast;
+
+import com.google.dart.compiler.resolver.ClassNodeElement;
+import com.google.dart.compiler.resolver.Element;
+
+import java.util.List;
+
+/**
+ * Instances of the class {@code DartClassTypeAlias} represent a class type alias.
+ */
+public class DartClassTypeAlias extends DartDeclaration<DartIdentifier> {
+  private final NodeList<DartTypeParameter> typeParameters = NodeList.create(this);
+  private final Modifiers modifiers;
+  private final DartTypeNode superclass;
+  private final NodeList<DartTypeNode> mixins = NodeList.create(this);
+  private final NodeList<DartTypeNode> interfaces = NodeList.create(this);
+  private ClassNodeElement element;
+
+  public DartClassTypeAlias(DartIdentifier name, List<DartTypeParameter> typeParameters,
+      Modifiers modifiers, DartTypeNode superclass, List<DartTypeNode> mixins,
+      List<DartTypeNode> interfaces) {
+    super(name);
+    this.typeParameters.addAll(typeParameters);
+    this.modifiers = modifiers;
+    this.superclass = superclass;
+    this.mixins.addAll(mixins);
+    this.interfaces.addAll(interfaces);
+  }
+
+  public List<DartTypeParameter> getTypeParameters() {
+    return typeParameters;
+  }
+
+  public Modifiers getModifiers() {
+    return modifiers;
+  }
+
+  public boolean isAbstract() {
+    return modifiers.isAbstract();
+  }
+
+  public DartTypeNode getSuperclass() {
+    return superclass;
+  }
+
+  public NodeList<DartTypeNode> getMixins() {
+    return mixins;
+  }
+
+  public List<DartTypeNode> getInterfaces() {
+    return interfaces;
+  }
+
+  public String getClassName() {
+    if (getName() == null) {
+      return null;
+    }
+    return getName().getName();
+  }
+
+  @Override
+  public ClassNodeElement getElement() {
+    return element;
+  }
+
+  @Override
+  public void setElement(Element element) {
+    this.element = (ClassNodeElement) element;
+  }
+
+  @Override
+  public void visitChildren(ASTVisitor<?> visitor) {
+    super.visitChildren(visitor);
+    typeParameters.accept(visitor);
+    superclass.accept(visitor);
+    mixins.accept(visitor);
+    interfaces.accept(visitor);
+  }
+
+  @Override
+  public <R> R accept(ASTVisitor<R> visitor) {
+    return visitor.visitClassTypeAlias(this);
+  }
+}