com.github.triceo.robozonky.app.configuration.daemon.RefreshableStrategy Maven / Gradle / Ivy

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/*
 * Copyright 2017 The RoboZonky 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 com.github.triceo.robozonky.app.configuration.daemon;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Collectors;

import com.github.triceo.robozonky.api.Refreshable;
import com.github.triceo.robozonky.internal.api.Defaults;

abstract class RefreshableStrategy extends Refreshable {

    protected static URL convertToUrl(final String maybeUrl) {
        try {
            return new URL(maybeUrl);
        } catch (final MalformedURLException e) {
            try {
                return new File(maybeUrl).toURI().toURL();
            } catch (final NullPointerException | MalformedURLException e1) {
                throw new IllegalStateException("Cannot load strategy " + maybeUrl, e1);
            }
        }
    }

    private final URL url;

    protected RefreshableStrategy(final URL target) {
        this.url = target;
    }

    @Override
    protected Supplier> getLatestSource() {
        return () -> {
            try (final BufferedReader r =
                         new BufferedReader(new InputStreamReader(url.openStream(), Defaults.CHARSET))) {
                return Optional.of(r.lines().collect(Collectors.joining(System.lineSeparator())));
            } catch (final IOException ex) {
                LOGGER.warn("Failed reading strategy.", ex);
                return Optional.empty();
            }
        };
    }
}