Expose some information about Java compilation to Skylark.

--
MOS_MIGRATED_REVID=114438050

3 files changed, 141 insertions, 4 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaCommon.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCommon.java
index 0839da12c2..0b310b7dd9 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaCommon.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCommon.java
@@ -572,7 +572,8 @@ public class JavaCommon {
     builder
         .add(JavaExportsProvider.class, new JavaExportsProvider(collectTransitiveExports()))
         .addSkylarkTransitiveInfo(JavaSkylarkApiProvider.NAME, new JavaSkylarkApiProvider())
-        .addOutputGroup(OutputGroupProvider.FILES_TO_COMPILE, getFilesToCompile(classJar));
+        .addOutputGroup(OutputGroupProvider.FILES_TO_COMPILE, getFilesToCompile(classJar))
+        .add(JavaCompilationInfoProvider.class, createCompilationInfoProvider());
   }
 
   private void addInstrumentationFilesProvider(RuleConfiguredTargetBuilder builder,
@@ -755,4 +756,13 @@ public class JavaCommon {
   public RuleContext getRuleContext() {
     return ruleContext;
   }
+
+  private JavaCompilationInfoProvider createCompilationInfoProvider() {
+    return new JavaCompilationInfoProvider.Builder()
+        .setJavacOpts(javacOpts)
+        .setBootClasspath(getBootClasspath())
+        .setCompilationClasspath(getCompileTimeClasspath())
+        .setRuntimeClasspath(getRuntimeClasspath())
+        .build();
+  }
 }
diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationInfoProvider.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationInfoProvider.java
new file mode 100644
index 0000000000..76750e72ea
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompilationInfoProvider.java
@@ -0,0 +1,116 @@
+// Copyright 2016 The Bazel Authors. 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.java;
+
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
+import com.google.devtools.build.lib.collect.nestedset.NestedSet;
+import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
+
+/**
+ * A class that provides compilation information in Java rules, for perusal of aspects and tools.
+ */
+@SkylarkModule(
+  name = "JavaCompilationInfo",
+  doc = "Provides access to compilation information for Java rules"
+)
+@Immutable
+public class JavaCompilationInfoProvider implements TransitiveInfoProvider {
+  private final ImmutableList<String> javacOpts;
+  private final NestedSet<Artifact> runtimeClasspath;
+  private final NestedSet<Artifact> compilationClasspath;
+  private final ImmutableList<Artifact> bootClasspath;
+
+  /**
+   * Builder for {@link JavaCompilationInfoProvider}.
+   */
+  public static class Builder {
+    private ImmutableList<String> javacOpts;
+    private NestedSet<Artifact> runtimeClasspath;
+    private NestedSet<Artifact> compilationClasspath;
+    private ImmutableList<Artifact> bootClasspath;
+
+    public Builder setJavacOpts(ImmutableList<String> javacOpts) {
+      this.javacOpts = javacOpts;
+      return this;
+    }
+
+    public Builder setRuntimeClasspath(NestedSet<Artifact> runtimeClasspath) {
+      this.runtimeClasspath = runtimeClasspath;
+      return this;
+    }
+
+    public Builder setCompilationClasspath(NestedSet<Artifact> compilationClasspath) {
+      this.compilationClasspath = compilationClasspath;
+      return this;
+    }
+
+    public Builder setBootClasspath(ImmutableList<Artifact> bootClasspath) {
+      this.bootClasspath = bootClasspath;
+      return this;
+    }
+
+    public JavaCompilationInfoProvider build() {
+      return new JavaCompilationInfoProvider(
+          javacOpts, runtimeClasspath, compilationClasspath, bootClasspath);
+    }
+  }
+
+  @SkylarkCallable(name = "javac_options", structField = true, doc = "Options to java compiler")
+  public ImmutableList<String> getJavacOpts() {
+    return javacOpts;
+  }
+
+  @SkylarkCallable(
+    name = "runtime_classpath",
+    structField = true,
+    doc = "Run-time classpath for this Java target"
+  )
+  public NestedSet<Artifact> getRuntimeClasspath() {
+    return runtimeClasspath;
+  }
+
+  @SkylarkCallable(
+    name = "compilation_classpath",
+    structField = true,
+    doc = "Compilation classpath for this Java target"
+  )
+  public NestedSet<Artifact> getCompilationClasspath() {
+    return compilationClasspath;
+  }
+
+  @SkylarkCallable(
+    name = "boot_classpath",
+    structField = true,
+    doc = "Boot classpath for this Java target"
+  )
+  public ImmutableList<Artifact> getBootClasspath() {
+    return bootClasspath;
+  }
+
+  private JavaCompilationInfoProvider(
+      ImmutableList<String> javacOpts,
+      NestedSet<Artifact> runtimeClasspath,
+      NestedSet<Artifact> compileTimeClasspath,
+      ImmutableList<Artifact> bootClasspath) {
+    this.javacOpts = javacOpts;
+    this.runtimeClasspath = runtimeClasspath;
+    this.compilationClasspath = compileTimeClasspath;
+    this.bootClasspath = bootClasspath;
+  }
+}
diff --git a/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkApiProvider.java b/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkApiProvider.java
index 48d4056e4e..98cff71e15 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkApiProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/java/JavaSkylarkApiProvider.java
@@ -72,7 +72,7 @@ public final class JavaSkylarkApiProvider extends SkylarkApiProvider {
 
   @SkylarkCallable(
     name = "outputs",
-    doc = "Returns information about outputs of this Java rule",
+    doc = "Returns information about outputs of this Java target",
     structField = true
   )
   public JavaRuleOutputJarsProvider getOutputJars() {
@@ -81,11 +81,22 @@ public final class JavaSkylarkApiProvider extends SkylarkApiProvider {
 
   @SkylarkCallable(
     name = "annotation_processing",
-    structField = true, allowReturnNones = true,
-    doc = "Returns information about annotation processing for this Java rule"
+    structField = true,
+    allowReturnNones = true,
+    doc = "Returns information about annotation processing for this Java target"
   )
   public JavaGenJarsProvider getGenJarsProvider() {
     return getInfo().getProvider(JavaGenJarsProvider.class);
   }
 
+  @SkylarkCallable(
+    name = "compilation_info",
+    structField = true,
+    allowReturnNones = true,
+    doc = "Returns compilation information for this Java target"
+  )
+  public JavaCompilationInfoProvider getCompilationInfoProvider() {
+    return getInfo().getProvider(JavaCompilationInfoProvider.class);
+  }
+
 }