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      1 /*
      2  * Copyright (C) 2008-2009 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 android.gesture;
     18 
     19 import java.util.ArrayList;
     20 
     21 /**
     22  * The abstract class of a gesture learner
     23  */
     24 abstract class Learner {
     25     private final ArrayList<Instance> mInstances = new ArrayList<Instance>();
     26 
     27     /**
     28      * Add an instance to the learner
     29      *
     30      * @param instance
     31      */
     32     void addInstance(Instance instance) {
     33         mInstances.add(instance);
     34     }
     35 
     36     /**
     37      * Retrieve all the instances
     38      *
     39      * @return instances
     40      */
     41     ArrayList<Instance> getInstances() {
     42         return mInstances;
     43     }
     44 
     45     /**
     46      * Remove an instance based on its id
     47      *
     48      * @param id
     49      */
     50     void removeInstance(long id) {
     51         ArrayList<Instance> instances = mInstances;
     52         int count = instances.size();
     53         for (int i = 0; i < count; i++) {
     54             Instance instance = instances.get(i);
     55             if (id == instance.id) {
     56                 instances.remove(instance);
     57                 return;
     58             }
     59         }
     60     }
     61 
     62     /**
     63      * Remove all the instances of a category
     64      *
     65      * @param name the category name
     66      */
     67     void removeInstances(String name) {
     68         final ArrayList<Instance> toDelete = new ArrayList<Instance>();
     69         final ArrayList<Instance> instances = mInstances;
     70         final int count = instances.size();
     71 
     72         for (int i = 0; i < count; i++) {
     73             final Instance instance = instances.get(i);
     74             // the label can be null, as specified in Instance
     75             if ((instance.label == null && name == null)
     76                     || (instance.label != null && instance.label.equals(name))) {
     77                 toDelete.add(instance);
     78             }
     79         }
     80         instances.removeAll(toDelete);
     81     }
     82 
     83     abstract ArrayList<Prediction> classify(int sequenceType, int orientationType, float[] vector);
     84 }
     85