Protocol Buffer runtime library and 'protoc' plugin

lib/protobuf/runtime/PbImmutableList.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/*
+ * This is a wrapper around a fixed-length list with modifications disabled.
+ */
+class PbImmutableList<T> implements List<T>, Hashable {
+  List<T> _wrappedList;
+  int _memoizedHashCode = -1;
+
+  static List _EMPTY;
+  static PbImmutableList get EMPTY() {
+    if (_EMPTY == null) {
+      _EMPTY = new PbImmutableList.from([]);
+    }
+    return _EMPTY;
+  }
+
+  PbImmutableList.from(List<T> list) {
+    _wrappedList = new List(list.length);
+    _wrappedList.setRange(0, list.length, list);
+  }
+
+  bool operator ==(Object o) {
+    if (o is! PbImmutableList){
+      return false;
+    }
+    PbImmutableList oil = o;
+    if (length != oil.length) {
+      return false;
+    }
+
+    for (int i = 0; i < length; i++) {
+      if (this[i] != oil[i]) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  int hashCode() {
+    if (_memoizedHashCode == -1) {
+      _memoizedHashCode = 13 * length;
+      for (var entry in this) {
+        if (entry is Hashable) {
+          _memoizedHashCode = (19 * _memoizedHashCode) + entry.hashCode;
+        }
+      }
+    }
+    return _memoizedHashCode;
+  }
+
+  T operator [](int index) => _wrappedList[index];
+
+  List<T> getRange(int start, int length) =>
+      _wrappedList.getRange(start, length);
+
+  int indexOf(T element, [int start = 0]) =>
+      _wrappedList.indexOf(element, start);
+
+  Iterator<T> iterator() => _wrappedList.iterator();
+
+  T last() => this[length - 1];
+
+  int lastIndexOf(T element, [int start = null]) =>
+      _wrappedList.lastIndexOf(element, start);
+
+  int get length() => _wrappedList.length;
+
+  String toString() {
+    return "PbImmutableList";
+  }
+
+  void operator []=(int index, T value) {
+    throw const UnsupportedOperationException(
+        "Cannot modify an immutable list");
+  }
+
+  void copyFrom(List src, int srcStart, int dstStart, int count) {
+    throw const UnsupportedOperationException(
+        "Cannot modify an immutable list");
+  }
+
+  void setRange(int start, int length, List<T> from, [int startFrom = 0]) {
+    throw const UnsupportedOperationException(
+        "Cannot modify an immutable list");
+  }
+
+  void removeRange(int start, int length) {
+    throw const UnsupportedOperationException(
+        "Cannot remove range of an immutable list");
+  }
+
+  void insertRange(int start, int length, [T initialValue = null]) {
+    throw const UnsupportedOperationException(
+        "Cannot insert range in an immutable list");
+  }
+
+  void sort(int compare(T a, T b)) {
+    throw const UnsupportedOperationException(
+        "Cannot modify an immutable list");
+  }
+
+  void add(T element) {
+    throw const UnsupportedOperationException(
+        "Cannot add to an immutable list");
+  }
+
+  void addLast(T element) {
+    add(element);
+  }
+
+  void addAll(Collection<T> elements) {
+    throw const UnsupportedOperationException(
+        "Cannot add to an immutable list");
+  }
+
+  void clear() {
+    throw const UnsupportedOperationException(
+        "Cannot clear an immutable list");
+  }
+
+  void set length(int length) {
+    throw const UnsupportedOperationException(
+        "Cannot change the length of an immutable list");
+  }
+
+  T removeLast() {
+    throw const UnsupportedOperationException(
+        "Cannot remove in a non-extendable list");
+  }
+
+  /**
+   * Collection interface.
+   */
+
+  void forEach(f(T element)) => _wrappedList.forEach(f);
+
+  Collection<T> filter(bool f(T element)) => _wrappedList.filter(f);
+
+  bool every(bool f(T element)) => _wrappedList.every(f);
+
+  bool some(bool f(T element)) => _wrappedList.some(f);
+
+  bool isEmpty() => _wrappedList.isEmpty();
+  
+  Collection map(f(T element)) {
+    throw "not implemented";
+  }
+}