android/nfc/dta/NfcDta.java

/*
 * Copyright (C) 2017 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.nfc.dta;

import android.content.Context;
import android.nfc.INfcDta;
import android.nfc.NfcAdapter;
import android.os.RemoteException;
import android.util.Log;

import java.util.HashMap;

/**
 * This class provides the primary API for DTA operations.
 * @hide
 */
public final class NfcDta {
    private static final String TAG = "NfcDta";

    private static INfcDta sService;
    private static HashMap<Context, NfcDta> sNfcDtas = new HashMap<Context, NfcDta>();

    private final Context mContext;

    private NfcDta(Context context, INfcDta service) {
        mContext = context.getApplicationContext();
        sService = service;
    }

    /**
     * Helper to get an instance of this class.
     *
     * @param adapter A reference to an NfcAdapter object.
     * @return
     */
    public static synchronized NfcDta getInstance(NfcAdapter adapter) {
        if (adapter == null) throw new NullPointerException("NfcAdapter is null");
        Context context = adapter.getContext();
        if (context == null) {
            Log.e(TAG, "NfcAdapter context is null.");
            throw new UnsupportedOperationException();
        }

        NfcDta manager = sNfcDtas.get(context);
        if (manager == null) {
            INfcDta service = adapter.getNfcDtaInterface();
            if (service == null) {
                Log.e(TAG, "This device does not implement the INfcDta interface.");
                throw new UnsupportedOperationException();
            }
            manager = new NfcDta(context, service);
            sNfcDtas.put(context, manager);
        }
        return manager;
    }

    /**
     * Enables DTA mode
     *
     * @return true/false if enabling was successful
     */
    public boolean enableDta() {
        try {
            sService.enableDta();
        } catch (RemoteException e) {
            return false;
        }
        return true;
    }

    /**
     * Disables DTA mode
     *
     * @return true/false if disabling was successful
     */
    public boolean disableDta() {
        try {
            sService.disableDta();
        } catch (RemoteException e) {
            return false;
        }
        return true;
    }

    /**
     * Enables Server
     *
     * @return true/false if enabling was successful
     */
    public boolean enableServer(String serviceName, int serviceSap, int miu,
            int rwSize, int testCaseId) {
        try {
            return sService.enableServer(serviceName, serviceSap, miu, rwSize, testCaseId);
        } catch (RemoteException e) {
            return false;
        }
    }

    /**
     * Disables Server
     *
     * @return true/false if disabling was successful
     */
    public boolean disableServer() {
        try {
            sService.disableServer();
        } catch (RemoteException e) {
            return false;
        }
        return true;
    }

    /**
     * Enables Client
     *
     * @return true/false if enabling was successful
     */
    public boolean enableClient(String serviceName, int miu, int rwSize,
            int testCaseId) {
        try {
            return sService.enableClient(serviceName, miu, rwSize, testCaseId);
        } catch (RemoteException e) {
            return false;
        }
    }

    /**
     * Disables client
     *
     * @return true/false if disabling was successful
     */
    public boolean disableClient() {
        try {
            sService.disableClient();
        } catch (RemoteException e) {
            return false;
        }
        return true;
    }

    /**
     * Registers Message Service
     *
     * @return true/false if registration was successful
     */
    public boolean registerMessageService(String msgServiceName) {
        try {
            return sService.registerMessageService(msgServiceName);
        } catch (RemoteException e) {
            return false;
        }
    }
}