1 files changed, 181 insertions, 0 deletions
diff --git a/src/ProtocolBuffers/AbstractMessage.cs b/src/ProtocolBuffers/AbstractMessage.cs
new file mode 100644
index 00000000..d8b9e9e6
--- /dev/null
+++ b/src/ProtocolBuffers/AbstractMessage.cs
@@ -0,0 +1,181 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using Google.ProtocolBuffers.Collections;
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers {
+  /// <summary>
+  /// Implementation of the non-generic IMessage interface as far as possible.
+  /// </summary>
+  public abstract class AbstractMessage<TMessage, TBuilder> : IMessage<TMessage, TBuilder> 
+      where TMessage : AbstractMessage<TMessage, TBuilder> 
+      where TBuilder : AbstractBuilder<TMessage, TBuilder> {
+    /// <summary>
+    /// The serialized size if it's already been computed, or null
+    /// if we haven't computed it yet.
+    /// </summary>
+    private int? memoizedSize = null;
+
+    #region Unimplemented members of IMessage
+    public abstract MessageDescriptor DescriptorForType { get; }
+    public abstract IDictionary<FieldDescriptor, object> AllFields { get; }
+    public abstract bool HasField(FieldDescriptor field);
+    public abstract object this[FieldDescriptor field] { get; }
+    public abstract int GetRepeatedFieldCount(FieldDescriptor field);
+    public abstract object this[FieldDescriptor field, int index] { get; }
+    public abstract UnknownFieldSet UnknownFields { get; }
+    public abstract TMessage DefaultInstanceForType { get; }
+    public abstract TBuilder CreateBuilderForType();
+    #endregion
+    
+    public IBuilder WeakCreateBuilderForType() {
+      return CreateBuilderForType();
+    }
+
+    public IMessage WeakDefaultInstanceForType {
+      get { return DefaultInstanceForType; }
+    }
+
+    public virtual bool IsInitialized {
+      get {
+        // Check that all required fields are present.
+        foreach (FieldDescriptor field in DescriptorForType.Fields) {
+          if (field.IsRequired && !HasField(field)) {
+            return false;
+          }
+        }
+
+        // Check that embedded messages are initialized.
+        foreach (KeyValuePair<FieldDescriptor, object> entry in AllFields) {
+          FieldDescriptor field = entry.Key;
+          if (field.MappedType == MappedType.Message) {
+            if (field.IsRepeated) {
+              // We know it's an IList<T>, but not the exact type - so
+              // IEnumerable is the best we can do. (C# generics aren't covariant yet.)
+              foreach (IMessage element in (IEnumerable) entry.Value) {
+                if (!element.IsInitialized) {
+                  return false;
+                }
+              }
+            } else {
+              if (!((IMessage)entry.Value).IsInitialized) {
+                return false;
+              }
+            }
+          }
+        }
+        return true;
+      }
+    }
+
+    public sealed override string ToString() {
+      return TextFormat.PrintToString(this);
+    }
+
+    public virtual void WriteTo(CodedOutputStream output) {
+      foreach (KeyValuePair<FieldDescriptor, object> entry in AllFields) {
+        FieldDescriptor field = entry.Key;
+        if (field.IsRepeated) {
+          // We know it's an IList<T>, but not the exact type - so
+          // IEnumerable is the best we can do. (C# generics aren't covariant yet.)
+          foreach (object element in (IEnumerable)entry.Value) {
+            output.WriteField(field.FieldType, field.FieldNumber, element);
+          }
+        } else {
+          output.WriteField(field.FieldType, field.FieldNumber, entry.Value);
+        }
+      }
+
+      UnknownFieldSet unknownFields = UnknownFields;
+      if (DescriptorForType.Options.MessageSetWireFormat) {
+        unknownFields.WriteAsMessageSetTo(output);
+      } else {
+        unknownFields.WriteTo(output);
+      }
+    }
+
+    public virtual int SerializedSize {
+      get {
+        if (memoizedSize != null) {
+          return memoizedSize.Value;
+        }
+
+        int size = 0;
+        foreach (KeyValuePair<FieldDescriptor, object> entry in AllFields) {
+          FieldDescriptor field = entry.Key;
+          if (field.IsRepeated) {
+            foreach (object element in (IEnumerable) entry.Value) {
+              size += CodedOutputStream.ComputeFieldSize(field.FieldType, field.FieldNumber, element);
+            }
+          } else {
+            size += CodedOutputStream.ComputeFieldSize(field.FieldType, field.FieldNumber, entry.Value);
+          }
+        }
+
+        UnknownFieldSet unknownFields = UnknownFields;
+        if (DescriptorForType.Options.MessageSetWireFormat) {
+          size += unknownFields.SerializedSizeAsMessageSet;
+        } else {
+          size += unknownFields.SerializedSize;
+        }
+
+        memoizedSize = size;
+        return size;
+      }
+    }
+
+    public ByteString ToByteString() {
+      ByteString.CodedBuilder output = new ByteString.CodedBuilder(SerializedSize);
+      WriteTo(output.CodedOutput);
+      return output.Build();
+    }
+
+    public byte[] ToByteArray() {
+      byte[] result = new byte[SerializedSize];
+      CodedOutputStream output = CodedOutputStream.CreateInstance(result);
+      WriteTo(output);
+      output.CheckNoSpaceLeft();
+      return result;
+    }
+
+    public void WriteTo(Stream output) {
+      CodedOutputStream codedOutput = CodedOutputStream.CreateInstance(output);
+      WriteTo(codedOutput);
+      codedOutput.Flush();
+    }
+
+    public override bool Equals(object other) {
+      if (other == this) {
+        return true;
+      }
+      IMessage otherMessage = other as IMessage;
+      if (otherMessage == null || otherMessage.DescriptorForType != DescriptorForType) {
+        return false;
+      }
+      return Dictionaries.Equals(AllFields, otherMessage.AllFields);
+    }
+
+    public override int GetHashCode() {
+      int hash = 41;
+      hash = (19 * hash) + DescriptorForType.GetHashCode();
+      hash = (53 * hash) + Dictionaries.GetHashCode(AllFields);
+      return hash;
+    }
+  }
+}