Android example source code file (Learner.java)

This example Android source code file (Learner.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

arraylist, instance, learner, util

The Learner.java Android example source code

/*
 * 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();

    /**
     * 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();
        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);
}