1 files changed, 97 insertions, 0 deletions
diff --git a/src/com/google/common/io/protocol/ProtoBufUtil.java b/src/com/google/common/io/protocol/ProtoBufUtil.java
new file mode 100644
index 0000000..077bd3d
--- /dev/null
+++ b/src/com/google/common/io/protocol/ProtoBufUtil.java
@@ -0,0 +1,97 @@
+// Copyright 2008 The Android Open Source Project
+
+package com.google.common.io.protocol;
+
+/**
+ * Utility functions for dealing with ProtoBuf objects consolidated from
+ * previous spot implementations across the codebase.
+ *
+ */
+public final class ProtoBufUtil {
+  private ProtoBufUtil() {
+  }
+
+  /** Convenience method to return a string value from of a proto or "". */
+  public static String getProtoValueOrEmpty(ProtoBuf proto, int tag) {
+    try {
+      return (proto != null && proto.has(tag)) ? proto.getString(tag) : "";
+    } catch (ClassCastException e) {
+      return "";
+    }
+  }
+
+  /** Convenience method to return a string value from of a sub-proto or "". */
+  public static String getSubProtoValueOrEmpty(
+      ProtoBuf proto, int sub, int tag) {
+    try {
+      ProtoBuf subProto =
+          (proto != null && proto.has(sub)) ? proto.getProtoBuf(sub) : null;
+      return getProtoValueOrEmpty(subProto, tag);
+    } catch (ClassCastException e) {
+      return "";
+    }
+  }
+
+  /**
+   * Get an Int with "tag" from the proto buffer.
+   * If the given field can't be retrieved, return 0.
+   *
+   * @param proto The proto buffer.
+   * @param tag The tag value that identifies which protocol buffer field to
+   * retrieve.
+   * @return The result which should be an integer.
+   */
+  public static int getProtoValueOrZero(ProtoBuf proto, int tag) {
+    try {
+      return (proto != null && proto.has(tag)) ? proto.getInt(tag) : 0;
+    } catch (IllegalArgumentException e) {
+      return 0;
+    } catch (ClassCastException e) {
+      return 0;
+    }
+  }
+
+  /**
+   * Get an Int with "tag" from the proto buffer.
+   * If the given field can't be retrieved, return -1.
+   *
+   * @param proto The proto buffer.
+   * @param tag The tag value that identifies which protocol buffer field to
+   * retrieve.
+   * @return The result which should be a long.
+   */
+  public static long getProtoValueOrNegativeOne(ProtoBuf proto, int tag) {
+    try {
+      return (proto != null && proto.has(tag)) ? proto.getLong(tag) : -1;
+    } catch (IllegalArgumentException e) {
+      return -1;
+    } catch (ClassCastException e) {
+      return -1;
+    }
+  }
+
+  /**
+   * A wrapper for <code> getProtoValueOrNegativeOne </code> that drills into
+   * a sub message returning the long value if it exists, returning -1 if it
+   * does not.
+   *
+   * @param proto The proto buffer.
+   * @param tag The tag value that identifies which protocol buffer field to
+   * retrieve.
+   * @param sub The sub tag value that identifies which protocol buffer
+   * sub-field to retrieve.n
+   * @return The result which should be a long.
+   */
+  public static long getSubProtoValueOrNegativeOne(
+      ProtoBuf proto, int sub, int tag) {
+    try {
+      ProtoBuf subProto =
+          (proto != null && proto.has(sub)) ? proto.getProtoBuf(sub) : null;
+      return getProtoValueOrNegativeOne(subProto, tag);
+    } catch (IllegalArgumentException e) {
+      return -1;
+    } catch (ClassCastException e) {
+      return -1; 
+    }
+  }
+}