1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.inputmethod.latin.utils; 18 19 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo; 20 21 import java.util.Collection; 22 import java.util.Comparator; 23 import java.util.TreeSet; 24 25 /** 26 * A TreeSet that is bounded in size and throws everything that's smaller than its limit 27 */ 28 public final class BoundedTreeSet extends TreeSet<SuggestedWordInfo> { 29 private final int mCapacity; BoundedTreeSet(final Comparator<SuggestedWordInfo> comparator, final int capacity)30 public BoundedTreeSet(final Comparator<SuggestedWordInfo> comparator, final int capacity) { 31 super(comparator); 32 mCapacity = capacity; 33 } 34 35 @Override add(final SuggestedWordInfo e)36 public boolean add(final SuggestedWordInfo e) { 37 if (size() < mCapacity) return super.add(e); 38 if (comparator().compare(e, last()) > 0) return false; 39 super.add(e); 40 pollLast(); // removes the last element 41 return true; 42 } 43 44 @Override addAll(final Collection<? extends SuggestedWordInfo> e)45 public boolean addAll(final Collection<? extends SuggestedWordInfo> e) { 46 if (null == e) return false; 47 return super.addAll(e); 48 } 49 } 50