content: /*
   * Copyright (C) 2008-2009 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 android.gesture;
  
  import java.util.ArrayList;
  
  /**
   * The abstract class of a gesture learner
   */
  abstract class Learner {
      private final ArrayList<Instance> mInstances = new ArrayList<Instance>();
  
      /**
       * Add an instance to the learner
       * 
       * @param instance
       */
      void addInstance(Instance instance) {
          mInstances.add(instance);
      }
  
      /**
       * Retrieve all the instances
       * 
       * @return instances
       */
      ArrayList<Instance> getInstances() {
          return mInstances;
      }
  
      /**
       * Remove an instance based on its id
       * 
       * @param id
       */
      void removeInstance(long id) {
          ArrayList<Instance> instances = mInstances;
          int count = instances.size();
          for (int i = 0; i < count; i++) {
              Instance instance = instances.get(i);
              if (id == instance.id) {
                  instances.remove(instance);
                  return;
              }
          }
      }
  
      /**
       * Remove all the instances of a category
       * 
       * @param name the category name
       */
      void removeInstances(String name) {
          final ArrayList<Instance> toDelete = new ArrayList<Instance>();
          final ArrayList<Instance> instances = mInstances;
          final int count = instances.size();
  
          for (int i = 0; i < count; i++) {
              final Instance instance = instances.get(i);
              // the label can be null, as specified in Instance
              if ((instance.label == null && name == null)
                      || (instance.label != null && instance.label.equals(name))) {
                  toDelete.add(instance);
              }
          }
          instances.removeAll(toDelete);
      }
  
      abstract ArrayList<Prediction> classify(int sequenceType, int orientationType, float[] vector);
  }
  