1 files changed, 116 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/shell/CommandResult.java b/src/main/java/com/google/devtools/build/lib/shell/CommandResult.java
new file mode 100644
index 0000000000..185f91df6e
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/shell/CommandResult.java
@@ -0,0 +1,116 @@
+// 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.shell;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Encapsulates the results of a command execution, including exit status
+ * and output to stdout and stderr.
+ */
+public final class CommandResult {
+
+  private static final Logger log =
+    Logger.getLogger("com.google.devtools.build.lib.shell.Command");
+
+  private static final byte[] NO_BYTES = new byte[0];
+
+  static final ByteArrayOutputStream EMPTY_OUTPUT =
+    new ByteArrayOutputStream() {
+
+      @Override
+      public byte[] toByteArray() {
+        return NO_BYTES;
+      }
+  };
+
+  static final ByteArrayOutputStream NO_OUTPUT_COLLECTED =
+    new ByteArrayOutputStream(){
+
+      @Override
+      public byte[] toByteArray() {
+        throw new IllegalStateException("Output was not collected");
+      }
+  };
+
+  private final ByteArrayOutputStream stdout;
+  private final ByteArrayOutputStream stderr;
+  private final TerminationStatus terminationStatus;
+
+  CommandResult(final ByteArrayOutputStream stdout,
+                final ByteArrayOutputStream stderr,
+                final TerminationStatus terminationStatus) {
+    checkNotNull(stdout);
+    checkNotNull(stderr);
+    checkNotNull(terminationStatus);
+    this.stdout = stdout;
+    this.stderr = stderr;
+    this.terminationStatus = terminationStatus;
+  }
+
+  /**
+   * @return raw bytes that were written to stdout by the command, or
+   *  null if caller did chose to ignore output
+   * @throws IllegalStateException if output was not collected
+   */
+  public byte[] getStdout() {
+    return stdout.toByteArray();
+  }
+
+  /**
+   * @return raw bytes that were written to stderr by the command, or
+   *  null if caller did chose to ignore output
+   * @throws IllegalStateException if output was not collected
+   */
+  public byte[] getStderr() {
+    return stderr.toByteArray();
+  }
+
+  /**
+   * @return the result of Process.waitFor for the subprocess.
+   * @deprecated this returns the result of Process.waitFor, which is not
+   *   precisely defined, and is not to be confused with the value passed to
+   *   exit(2) by the subprocess.  Use getTerminationStatus() instead.
+   */
+  @Deprecated
+  public int getExitStatus() {
+    return terminationStatus.getRawResult();
+  }
+
+  /**
+   * @return the termination status of the subprocess.
+   */
+  public TerminationStatus getTerminationStatus() {
+    return terminationStatus;
+  }
+
+  void logThis() {
+    if (!log.isLoggable(Level.FINER)) {
+      return;
+    }
+    log.finer(terminationStatus.toString());
+
+    if (stdout == NO_OUTPUT_COLLECTED) {
+      return;
+    }
+    log.finer("Stdout: " + LogUtil.toTruncatedString(stdout.toByteArray()));
+    log.finer("Stderr: " + LogUtil.toTruncatedString(stderr.toByteArray()));
+  }
+
+}