Android example source code file (GestureLibraries.java)

This example Android source code file (GestureLibraries.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

android, content, context, could, file, filegesturelibrary, fileinputstream, filenotfoundexception, fileoutputstream, gesturelibraries, gesturelibrary, io, ioexception, override, resourcegesturelibrary, string, util, utilities, utils, weakreference

The GestureLibraries.java Android example source code

/*
 * Copyright (C) 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 android.util.Log;
import static android.gesture.GestureConstants.*;
import android.content.Context;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStream;
import java.lang.ref.WeakReference;

public final class GestureLibraries {
    private GestureLibraries() {
    }

    public static GestureLibrary fromFile(String path) {
        return fromFile(new File(path));
    }

    public static GestureLibrary fromFile(File path) {
        return new FileGestureLibrary(path);
    }

    public static GestureLibrary fromPrivateFile(Context context, String name) {
        return fromFile(context.getFileStreamPath(name));
    }

    public static GestureLibrary fromRawResource(Context context, int resourceId) {
        return new ResourceGestureLibrary(context, resourceId);
    }

    private static class FileGestureLibrary extends GestureLibrary {
        private final File mPath;

        public FileGestureLibrary(File path) {
            mPath = path;
        }

        @Override
        public boolean isReadOnly() {
            return !mPath.canWrite();
        }

        public boolean save() {
            if (!mStore.hasChanged()) return true;

            final File file = mPath;

            final File parentFile = file.getParentFile();
            if (!parentFile.exists()) {
                if (!parentFile.mkdirs()) {
                    return false;
                }
            }

            boolean result = false;
            try {
                //noinspection ResultOfMethodCallIgnored
                file.createNewFile();
                mStore.save(new FileOutputStream(file), true);
                result = true;
            } catch (FileNotFoundException e) {
                Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
            } catch (IOException e) {
                Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
            }

            return result;
        }

        public boolean load() {
            boolean result = false;
            final File file = mPath;
            if (file.exists() && file.canRead()) {
                try {
                    mStore.load(new FileInputStream(file), true);
                    result = true;
                } catch (FileNotFoundException e) {
                    Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
                } catch (IOException e) {
                    Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
                }
            }

            return result;
        }
    }

    private static class ResourceGestureLibrary extends GestureLibrary {
        private final WeakReference<Context> mContext;
        private final int mResourceId;

        public ResourceGestureLibrary(Context context, int resourceId) {
            mContext = new WeakReference<Context>(context);
            mResourceId = resourceId;
        }

        @Override
        public boolean isReadOnly() {
            return true;
        }

        public boolean save() {
            return false;
        }

        public boolean load() {
            boolean result = false;
            final Context context = mContext.get();
            if (context != null) {
                final InputStream in = context.getResources().openRawResource(mResourceId);
                try {
                    mStore.load(in, true);
                    result = true;
                } catch (IOException e) {
                    Log.d(LOG_TAG, "Could not load the gesture library from raw resource " +
                            context.getResources().getResourceName(mResourceId), e);
                }
            }

            return result;
        }
    }
}