Support for same prefix for multiple imports.

compiler/java/com/google/dart/compiler/resolver/LibraryPrefixElementImplementation.java

Index: compiler/java/com/google/dart/compiler/resolver/LibraryPrefixElementImplementation.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/LibraryPrefixElementImplementation.java b/compiler/java/com/google/dart/compiler/resolver/LibraryPrefixElementImplementation.java
new file mode 100644
index 0000000000000000000000000000000000000000..6b525218ff74212fd16766b0126e1a4d80ba68d6
--- /dev/null
+++ b/compiler/java/com/google/dart/compiler/resolver/LibraryPrefixElementImplementation.java
@@ -0,0 +1,73 @@
+// Copyright (c) 2012, 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.resolver;
+
+import com.google.common.collect.Lists;
+
+import java.util.Collection;
+import java.util.List;
+
+class LibraryPrefixElementImplementation extends AbstractNodeElement implements
+    LibraryPrefixElement {
+
+  private final List<LibraryElement> libraries = Lists.newArrayList();
+  private final Scope scope;
+
+  public LibraryPrefixElementImplementation(String name, Scope parent) {
+    super(null, name);
+    scope = new Scope("prefix:" + name, parent.getLibrary());
+//    scope = new Scope(name, parent.getLibrary()) {

[zundel, 2012/04/21 00:41:17]

remove commented out code

+//      @Override
+//      public Map<String, Element> getElements() {
+//        throw new RuntimeException("Not implemented");
+//      }
+//
+//      @Override
+//      public Element findLocalElement(String name) {
+//        for (LibraryElement library : libraries) {
+//          Element element = library.getScope().findLocalElement(name);
+//          if (element != null) {
+//            return element;
+//          }
+//        }
+//        return null;
+//      }
+//    };
+  }
+
+  @Override
+  public boolean isInterface() {
+    return false;
+  }
+
+  @Override
+  public Scope getScope() {
+    return scope;
+  }
+
+  @Override
+  public ElementKind getKind() {
+    return ElementKind.LIBRARY_PREFIX;
+  }
+
+  @Override
+  public Collection<Element> getMembers() {
+    return scope.getElements().values();
+  }
+
+  @Override
+  public Element lookupLocalElement(String name) {
+    return scope.findLocalElement(name);
+  }
+
+  public void addLibrary(LibraryElement library) {
+    libraries.add(library);
+  }
+
+  @Override
+  public List<LibraryElement> getLibraries() {
+    return libraries;
+  }
+}