1 files changed, 49 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/BoundedTreeSet.java b/java/src/com/android/inputmethod/latin/BoundedTreeSet.java
new file mode 100644
index 000000000..7f7ff31c8
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/BoundedTreeSet.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.android.inputmethod.latin;
+
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.TreeSet;
+
+/**
+ * A TreeSet that is bounded in size and throws everything that's smaller than its limit
+ */
+public final class BoundedTreeSet extends TreeSet<SuggestedWordInfo> {
+    private final int mCapacity;
+    public BoundedTreeSet(final Comparator<SuggestedWordInfo> comparator, final int capacity) {
+        super(comparator);
+        mCapacity = capacity;
+    }
+
+    @Override
+    public boolean add(final SuggestedWordInfo e) {
+        if (size() < mCapacity) return super.add(e);
+        if (comparator().compare(e, last()) > 0) return false;
+        super.add(e);
+        pollLast(); // removes the last element
+        return true;
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends SuggestedWordInfo> e) {
+        if (null == e) return false;
+        return super.addAll(e);
+    }
+}