Allow caching normalization step of comparator.

[Dictionary.git] / src / com / hughes / android / dictionary / engine / FastNormalizeComparator.java

diff --git a/src/com/hughes/android/dictionary/engine/FastNormalizeComparator.java b/src/com/hughes/android/dictionary/engine/FastNormalizeComparator.java
new file mode 100644 (file)
index 0000000..2bb8183
--- /dev/null
+++ b/src/com/hughes/android/dictionary/engine/FastNormalizeComparator.java
@@ -0,0 +1,32 @@
+// Copyright 2020 Reimar Döffinger. All Rights Reserved.
+//
+// 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.
+
+package com.hughes.android.dictionary.engine;
+
+import java.util.Comparator;
+
+public class FastNormalizeComparator implements Comparator<FastCompareString> {
+    private final NormalizeComparator c;
+
+    FastNormalizeComparator(NormalizeComparator c) {
+        this.c = c;
+    }
+
+    @Override
+    public int compare(FastCompareString a, FastCompareString b) {
+        if (a.n == null) a.n = c.normalize(a.s);
+        if (b.n == null) b.n = c.normalize(b.s);
+        return c.compareNormalized(a.s, b.s, a.n, b.n);
+    }
+}