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      1 /*
      2  * Copyright (C) 2009 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.pinyin;
     18 
     19 import java.util.Vector;
     20 
     21 import android.content.Context;
     22 
     23 /**
     24  * Class used to cache previously loaded soft keyboard layouts.
     25  */
     26 public class SkbPool {
     27     private static SkbPool mInstance = null;
     28 
     29     private Vector<SkbTemplate> mSkbTemplates = new Vector<SkbTemplate>();
     30     private Vector<SoftKeyboard> mSoftKeyboards = new Vector<SoftKeyboard>();
     31 
     32     private SkbPool() {
     33     }
     34 
     35     public static SkbPool getInstance() {
     36         if (null == mInstance) mInstance = new SkbPool();
     37         return mInstance;
     38     }
     39 
     40     public void resetCachedSkb() {
     41         mSoftKeyboards.clear();
     42     }
     43 
     44     public SkbTemplate getSkbTemplate(int skbTemplateId, Context context) {
     45         for (int i = 0; i < mSkbTemplates.size(); i++) {
     46             SkbTemplate t = mSkbTemplates.elementAt(i);
     47             if (t.getSkbTemplateId() == skbTemplateId) {
     48                 return t;
     49             }
     50         }
     51 
     52         if (null != context) {
     53             XmlKeyboardLoader xkbl = new XmlKeyboardLoader(context);
     54             SkbTemplate t = xkbl.loadSkbTemplate(skbTemplateId);
     55             if (null != t) {
     56                 mSkbTemplates.add(t);
     57                 return t;
     58             }
     59         }
     60         return null;
     61     }
     62 
     63     // Try to find the keyboard in the pool with the cache id. If there is no
     64     // keyboard found, try to load it with the given xml id.
     65     public SoftKeyboard getSoftKeyboard(int skbCacheId, int skbXmlId,
     66             int skbWidth, int skbHeight, Context context) {
     67         for (int i = 0; i < mSoftKeyboards.size(); i++) {
     68             SoftKeyboard skb = mSoftKeyboards.elementAt(i);
     69             if (skb.getCacheId() == skbCacheId && skb.getSkbXmlId() == skbXmlId) {
     70                 skb.setSkbCoreSize(skbWidth, skbHeight);
     71                 skb.setNewlyLoadedFlag(false);
     72                 return skb;
     73             }
     74         }
     75         if (null != context) {
     76             XmlKeyboardLoader xkbl = new XmlKeyboardLoader(context);
     77             SoftKeyboard skb = xkbl.loadKeyboard(skbXmlId, skbWidth, skbHeight);
     78             if (skb != null) {
     79                 if (skb.getCacheFlag()) {
     80                     skb.setCacheId(skbCacheId);
     81                     mSoftKeyboards.add(skb);
     82                 }
     83             }
     84             return skb;
     85         }
     86         return null;
     87     }
     88 }
     89