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// 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;
}
}
}
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