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author | Jan Tattermusch <jtattermusch@users.noreply.github.com> | 2015-04-17 14:15:52 -0700 |
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committer | Jan Tattermusch <jtattermusch@users.noreply.github.com> | 2015-04-17 14:15:52 -0700 |
commit | 01c8c35ca3d3424a9473dd22ea2456933b3e8d36 (patch) | |
tree | de582cb9ef3e449f24015dec09f80e998806b26a /csharp/src/ProtocolBuffers/Collections/Dictionaries.cs | |
parent | 813d6d652d8091e9365bfbd01efb5f2ee8bdfbce (diff) | |
parent | 1eab56aee8dddcb656db67d9fb87a8cc6a2ac112 (diff) | |
download | protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.tar.gz protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.tar.bz2 protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.zip |
Merge pull request #2 from jtattermusch/csharp_protobuf_imported
Pulling protobuf-csharp-port into csharp/ directory
Diffstat (limited to 'csharp/src/ProtocolBuffers/Collections/Dictionaries.cs')
-rw-r--r-- | csharp/src/ProtocolBuffers/Collections/Dictionaries.cs | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/Collections/Dictionaries.cs b/csharp/src/ProtocolBuffers/Collections/Dictionaries.cs new file mode 100644 index 00000000..1f3791b1 --- /dev/null +++ b/csharp/src/ProtocolBuffers/Collections/Dictionaries.cs @@ -0,0 +1,122 @@ +// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Google.ProtocolBuffers.Collections
+{
+ /// <summary>
+ /// Utility class for dictionaries.
+ /// </summary>
+ public static class Dictionaries
+ {
+ /// <summary>
+ /// Compares two dictionaries for equality. Each value is compared with equality using Equals
+ /// for non-IEnumerable implementations, and using EnumerableEquals otherwise.
+ /// TODO(jonskeet): This is clearly pretty slow, and involves lots of boxing/unboxing...
+ /// </summary>
+ public static bool Equals<TKey, TValue>(IDictionary<TKey, TValue> left, IDictionary<TKey, TValue> right)
+ {
+ if (left.Count != right.Count)
+ {
+ return false;
+ }
+ foreach (KeyValuePair<TKey, TValue> leftEntry in left)
+ {
+ TValue rightValue;
+ if (!right.TryGetValue(leftEntry.Key, out rightValue))
+ {
+ return false;
+ }
+
+ IEnumerable leftEnumerable = leftEntry.Value as IEnumerable;
+ IEnumerable rightEnumerable = rightValue as IEnumerable;
+ if (leftEnumerable == null || rightEnumerable == null)
+ {
+ if (!Equals(leftEntry.Value, rightValue))
+ {
+ return false;
+ }
+ }
+ else
+ {
+ if (!Enumerables.Equals(leftEnumerable, rightEnumerable))
+ {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ public static IDictionary<TKey, TValue> AsReadOnly<TKey, TValue>(IDictionary<TKey, TValue> dictionary)
+ {
+ return dictionary.IsReadOnly ? dictionary : new ReadOnlyDictionary<TKey, TValue>(dictionary);
+ }
+
+ /// <summary>
+ /// Creates a hashcode for a dictionary by XORing the hashcodes of all the fields
+ /// and values. (By XORing, we avoid ordering issues.)
+ /// TODO(jonskeet): Currently XORs other stuff too, and assumes non-null values.
+ /// </summary>
+ public static int GetHashCode<TKey, TValue>(IDictionary<TKey, TValue> dictionary)
+ {
+ int ret = 31;
+ foreach (KeyValuePair<TKey, TValue> entry in dictionary)
+ {
+ int hash = entry.Key.GetHashCode() ^ GetDeepHashCode(entry.Value);
+ ret ^= hash;
+ }
+ return ret;
+ }
+
+ /// <summary>
+ /// Determines the hash of a value by either taking it directly or hashing all the elements
+ /// for IEnumerable implementations.
+ /// </summary>
+ private static int GetDeepHashCode(object value)
+ {
+ IEnumerable iterable = value as IEnumerable;
+ if (iterable == null)
+ {
+ return value.GetHashCode();
+ }
+ int hash = 29;
+ foreach (object element in iterable)
+ {
+ hash = hash*37 + element.GetHashCode();
+ }
+ return hash;
+ }
+ }
+}
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