Index: dart/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/index/file/ContextCodec.java |
=================================================================== |
--- dart/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/index/file/ContextCodec.java (revision 0) |
+++ dart/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/index/file/ContextCodec.java (revision 0) |
@@ -0,0 +1,71 @@ |
+/* |
+ * Copyright (c) 2014, the Dart project authors. |
+ * |
+ * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html |
+ * |
+ * 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. |
+ */ |
+package com.google.dart.engine.internal.index.file; |
+ |
+import com.google.common.collect.Maps; |
+import com.google.dart.engine.context.AnalysisContext; |
+ |
+import java.util.Map; |
+ |
+/** |
+ * A helper that encodes/decodes {@link AnalysisContext}s from/to integers. |
+ * |
+ * @coverage dart.engine.index |
+ */ |
+public class ContextCodec { |
+ /** |
+ * A table mapping contexts to their unique indices. |
+ */ |
+ private final Map<AnalysisContext, Integer> contextToIndex = Maps.newHashMap(); |
+ |
+ /** |
+ * A table mapping indices to the corresponding contexts. |
+ */ |
+ private final Map<Integer, AnalysisContext> indexToContext = Maps.newHashMap(); |
+ |
+ /** |
+ * The next id to assign. |
+ */ |
+ private int nextId; |
+ |
+ /** |
+ * Returns the {@link AnalysisContext} that corresponds to the given index. |
+ */ |
+ public AnalysisContext decode(int index) { |
+ return indexToContext.get(index); |
+ } |
+ |
+ /** |
+ * Returns an unique index for the given {@link AnalysisContext}. |
+ */ |
+ public int encode(AnalysisContext context) { |
+ Integer index = contextToIndex.get(context); |
+ if (index == null) { |
+ index = nextId++; |
+ contextToIndex.put(context, index); |
+ indexToContext.put(index, context); |
+ } |
+ return index; |
+ } |
+ |
+ /** |
+ * Removes the given {@link AnalysisContext}. |
+ */ |
+ public void removeContext(AnalysisContext context) { |
+ Integer id = contextToIndex.remove(context); |
+ if (id != null) { |
+ indexToContext.remove(id); |
+ } |
+ } |
+} |
Property changes on: dart/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/index/file/ContextCodec.java |
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Added: svn:eol-style |
+ LF |