1 files changed, 125 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/workspace/Bind.java b/src/main/java/com/google/devtools/build/lib/rules/workspace/Bind.java
new file mode 100644
index 0000000000..49f829a1c2
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/workspace/Bind.java
@@ -0,0 +1,125 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.devtools.build.lib.rules.workspace;
+
+import com.google.common.collect.ImmutableCollection;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.UnmodifiableIterator;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.FileProvider;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTarget;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
+import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
+import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
+import com.google.devtools.build.lib.packages.Target;
+import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
+import com.google.devtools.build.lib.syntax.ClassObject;
+import com.google.devtools.build.lib.syntax.Label;
+import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
+
+/**
+ * Implementation for the bind rule.
+ */
+public class Bind implements RuleConfiguredTargetFactory {
+
+  /**
+   * This configured target pretends to be whatever type of target "actual" is, returning its
+   * transitive info providers and target, but returning the label for the //external target.
+   */
+  private static class BindConfiguredTarget implements ConfiguredTarget, ClassObject {
+
+    private Label label;
+    private ConfiguredTarget configuredTarget;
+    private BuildConfiguration config;
+
+    BindConfiguredTarget(RuleContext ruleContext) {
+      label = ruleContext.getRule().getLabel();
+      config = ruleContext.getConfiguration();
+      // TODO(bazel-team): we should special case ConfiguredTargetFactory.createConfiguredTarget,
+      // not cast down here.
+      configuredTarget = (ConfiguredTarget) ruleContext.getPrerequisite("actual", Mode.TARGET);
+    }
+
+    @Override
+    public <P extends TransitiveInfoProvider> P getProvider(Class<P> provider) {
+      return configuredTarget.getProvider(provider);
+    }
+
+    @Override
+    public Label getLabel() {
+      return label;
+    }
+
+    @Override
+    public Object get(String providerKey) {
+      return configuredTarget.get(providerKey);
+    }
+
+    @Override
+    public UnmodifiableIterator<TransitiveInfoProvider> iterator() {
+      return configuredTarget.iterator();
+    }
+
+    @Override
+    public Target getTarget() {
+      return configuredTarget.getTarget();
+    }
+
+    @Override
+    public BuildConfiguration getConfiguration() {
+      return config;
+    }
+
+    /* ClassObject methods */
+
+    @Override
+    public Object getValue(String name) {
+      if (name.equals("label")) {
+        return getLabel();
+      } else if (name.equals("files")) {
+        // A shortcut for files to build in Skylark. FileConfiguredTarget and RunleConfiguredTarget
+        // always has FileProvider and Error- and PackageGroupConfiguredTarget-s shouldn't be
+        // accessible in Skylark.
+        return SkylarkNestedSet.of(
+            Artifact.class, getProvider(FileProvider.class).getFilesToBuild());
+      }
+      return configuredTarget.get(name);
+    }
+
+    @SuppressWarnings("cast")
+    @Override
+    public ImmutableCollection<String> getKeys() {
+      return new ImmutableList.Builder<String>()
+          .add("label", "files")
+          .addAll(configuredTarget.getProvider(RuleConfiguredTarget.SkylarkProviders.class)
+              .getKeys())
+          .build();
+    }
+
+    @Override
+    public String errorMessage(String name) {
+      // Use the default error message.
+      return null;
+    }
+  }
+
+  @Override
+  public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException {
+    return new BindConfiguredTarget(ruleContext);
+  }
+
+}