66 lines
2.2 KiB
Java
66 lines
2.2 KiB
Java
/*
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* Copyright 2016 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.apps.abit.adapter;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.preference.PreferenceManager;
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import java.util.Arrays;
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import ch.dissem.bitmessage.InternalContext;
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import ch.dissem.bitmessage.ports.ProofOfWorkEngine;
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/**
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* Switches between two {@link ProofOfWorkEngine}s depending on the configuration.
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*
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* @author Christian Basler
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*/
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public class SwitchingProofOfWorkEngine implements ProofOfWorkEngine, InternalContext.ContextHolder {
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private final Context ctx;
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private final String preference;
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private final ProofOfWorkEngine option;
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private final ProofOfWorkEngine fallback;
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public SwitchingProofOfWorkEngine(Context ctx, String preference,
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ProofOfWorkEngine option, ProofOfWorkEngine fallback) {
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this.ctx = ctx;
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this.preference = preference;
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this.option = option;
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this.fallback = fallback;
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}
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@Override
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public void calculateNonce(byte[] initialHash, byte[] target, Callback callback) {
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SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(ctx);
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if (preferences.getBoolean(preference, false)) {
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option.calculateNonce(initialHash, target, callback);
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} else {
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fallback.calculateNonce(initialHash, target, callback);
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}
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}
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@Override
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public void setContext(InternalContext context) {
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for (ProofOfWorkEngine e : Arrays.asList(option, fallback)) {
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if (e instanceof InternalContext.ContextHolder) {
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((InternalContext.ContextHolder) e).setContext(context);
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}
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}
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}
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}
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