Initial commit - WPinternals 2.6

DiscUtils/Ntfs/IndexView.cs

@@ -0,0 +1,160 @@
+//
+// Copyright (c) 2008-2011, Kenneth Bell
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+namespace DiscUtils.Ntfs
+{
+    using System;
+    using System.Collections.Generic;
+
+    internal class IndexView<K, D>
+        where K : IByteArraySerializable, new()
+        where D : IByteArraySerializable, new()
+    {
+        private Index _index;
+
+        public IndexView(Index index)
+        {
+            _index = index;
+        }
+
+        public int Count
+        {
+            get { return _index.Count; }
+        }
+
+        public IEnumerable<KeyValuePair<K, D>> Entries
+        {
+            get
+            {
+                foreach (var entry in _index.Entries)
+                {
+                    yield return new KeyValuePair<K, D>(Convert<K>(entry.Key), Convert<D>(entry.Value));
+                }
+            }
+        }
+
+        public D this[K key]
+        {
+            get
+            {
+                return Convert<D>(_index[Unconvert(key)]);
+            }
+
+            set
+            {
+                _index[Unconvert(key)] = Unconvert<D>(value);
+            }
+        }
+
+        public IEnumerable<KeyValuePair<K, D>> FindAll(IComparable<byte[]> query)
+        {
+            foreach (var entry in _index.FindAll(query))
+            {
+                yield return new KeyValuePair<K, D>(Convert<K>(entry.Key), Convert<D>(entry.Value));
+            }
+        }
+
+        public KeyValuePair<K, D> FindFirst(IComparable<byte[]> query)
+        {
+            foreach (var entry in FindAll(query))
+            {
+                return entry;
+            }
+
+            return default(KeyValuePair<K, D>);
+        }
+
+        public IEnumerable<KeyValuePair<K, D>> FindAll(IComparable<K> query)
+        {
+            foreach (var entry in _index.FindAll(new ComparableConverter(query)))
+            {
+                yield return new KeyValuePair<K, D>(Convert<K>(entry.Key), Convert<D>(entry.Value));
+            }
+        }
+
+        public KeyValuePair<K, D> FindFirst(IComparable<K> query)
+        {
+            foreach (var entry in FindAll(query))
+            {
+                return entry;
+            }
+
+            return default(KeyValuePair<K, D>);
+        }
+
+        public bool TryGetValue(K key, out D data)
+        {
+            byte[] value;
+            if (_index.TryGetValue(Unconvert(key), out value))
+            {
+                data = Convert<D>(value);
+                return true;
+            }
+            else
+            {
+                data = default(D);
+                return false;
+            }
+        }
+
+        public bool ContainsKey(K key)
+        {
+            return _index.ContainsKey(Unconvert(key));
+        }
+
+        public void Remove(K key)
+        {
+            _index.Remove(Unconvert(key));
+        }
+
+        private static T Convert<T>(byte[] data)
+            where T : IByteArraySerializable, new()
+        {
+            T result = new T();
+            result.ReadFrom(data, 0);
+            return result;
+        }
+
+        private static byte[] Unconvert<T>(T value)
+            where T : IByteArraySerializable, new()
+        {
+            byte[] buffer = new byte[value.Size];
+            value.WriteTo(buffer, 0);
+            return buffer;
+        }
+
+        private class ComparableConverter : IComparable<byte[]>
+        {
+            private IComparable<K> _wrapped;
+
+            public ComparableConverter(IComparable<K> toWrap)
+            {
+                _wrapped = toWrap;
+            }
+
+            public int CompareTo(byte[] other)
+            {
+                return _wrapped.CompareTo(Convert<K>(other));
+            }
+        }
+    }
+}