// 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 {
///
/// Non-generic class with generic methods which proxy to the non-generic methods
/// in the generic class.
///
public static class Dictionaries {
///
/// 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...
///
public static bool Equals(IDictionary left, IDictionary right) {
if (left.Count != right.Count) {
return false;
}
foreach (KeyValuePair 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 (!object.Equals(leftEntry.Value, rightValue)) {
return false;
}
} else {
IEnumerator leftEnumerator = leftEnumerable.GetEnumerator();
try {
foreach (object rightObject in rightEnumerable) {
if (!leftEnumerator.MoveNext()) {
return false;
}
if (!object.Equals(leftEnumerator.Current, rightObject)) {
return false;
}
}
if (leftEnumerator.MoveNext()) {
return false;
}
} finally {
if (leftEnumerator is IDisposable) {
((IDisposable)leftEnumerator).Dispose();
}
}
}
}
return true;
}
public static IDictionary AsReadOnly (IDictionary dictionary) {
return dictionary.IsReadOnly ? dictionary : new ReadOnlyDictionary(dictionary);
}
///
/// 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.
///
public static int GetHashCode(IDictionary dictionary) {
int ret = 31;
foreach (KeyValuePair entry in dictionary) {
int hash = entry.Key.GetHashCode() ^ GetDeepHashCode(entry.Value);
ret ^= hash;
}
return ret;
}
///
/// Determines the hash of a value by either taking it directly or hashing all the elements
/// for IEnumerable implementations.
///
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;
}
}
}