1 files changed, 91 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/repository/JarFunction.java b/src/main/java/com/google/devtools/build/lib/bazel/repository/JarFunction.java
new file mode 100644
index 0000000000..e519a171db
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/bazel/repository/JarFunction.java
@@ -0,0 +1,91 @@
+// Copyright 2015 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.bazel.repository;
+
+import com.google.devtools.build.lib.bazel.repository.DecompressorValue.DecompressorDescriptor;
+import com.google.devtools.build.lib.bazel.repository.RepositoryFunction.RepositoryFunctionException;
+import com.google.devtools.build.lib.vfs.FileSystemUtils;
+import com.google.devtools.build.lib.vfs.Path;
+import com.google.devtools.build.skyframe.SkyFunction;
+import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
+import com.google.devtools.build.skyframe.SkyFunctionName;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+
+import javax.annotation.Nullable;
+
+/**
+ * Creates a repository for a jar file.
+ */
+public class JarFunction implements SkyFunction {
+
+  public static final SkyFunctionName NAME = SkyFunctionName.computed("JAR_FUNCTION");
+
+  /**
+   * The .jar can be used compressed, so this just exposes it in a way Bazel can use.
+   *
+   * <p>It moves the jar from some-name/x/y/z/foo.jar to some-name/jar/foo.jar and creates a
+   * BUILD file containing one entry: the .jar.</p>
+   */
+  @Override
+  @Nullable
+  public SkyValue compute(SkyKey skyKey, Environment env) throws RepositoryFunctionException {
+    DecompressorDescriptor descriptor = (DecompressorDescriptor) skyKey.argument();
+    // Example: archiveFile is external/some-name/foo.jar.
+    String baseName = descriptor.archivePath().getBaseName();
+
+    try {
+      FileSystemUtils.createDirectoryAndParents(descriptor.repositoryPath());
+      // external/some-name/WORKSPACE.
+      Path workspaceFile = descriptor.repositoryPath().getRelative("WORKSPACE");
+      FileSystemUtils.writeContent(workspaceFile, Charset.forName("UTF-8"), String.format(
+          "# DO NOT EDIT: automatically generated WORKSPACE file for %s rule %s\n",
+          descriptor.targetKind(), descriptor.targetName()));
+      // external/some-name/jar.
+      Path jarDirectory = descriptor.repositoryPath().getRelative("jar");
+      FileSystemUtils.createDirectoryAndParents(jarDirectory);
+      // external/some-name/repository/jar/foo.jar is a symbolic link to the jar in
+      // external/some-name.
+      Path jarSymlink = jarDirectory.getRelative(baseName);
+      if (!jarSymlink.exists()) {
+        jarSymlink.createSymbolicLink(descriptor.archivePath());
+      }
+      // external/some-name/repository/jar/BUILD defines the //jar target.
+      Path buildFile = jarDirectory.getRelative("BUILD");
+      FileSystemUtils.writeLinesAs(buildFile, Charset.forName("UTF-8"),
+          "# DO NOT EDIT: automatically generated BUILD file for " + descriptor.targetKind()
+              + " rule " + descriptor.targetName(),
+          "java_import(",
+          "    name = 'jar',",
+          "    jars = ['" + baseName + "'],",
+          "    visibility = ['//visibility:public']",
+          ")");
+    } catch (IOException e) {
+      throw new RepositoryFunctionException(new IOException(
+          "Error auto-creating jar repo structure: " + e.getMessage()), Transience.TRANSIENT);
+    }
+    return new DecompressorValue(descriptor.repositoryPath());
+  }
+
+  @Override
+  @Nullable
+  public String extractTag(SkyKey skyKey) {
+    return null;
+  }
+
+}