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• DockerPortFromPropertySupplier.java

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net.wouterdanes.docker.remoteapi.util.DockerPortFromPropertySupplier Maven / Gradle / Ivy

package net.wouterdanes.docker.remoteapi.util;

import com.google.common.base.Optional;
import com.google.common.base.Supplier;

import net.wouterdanes.docker.provider.RemoteDockerProvider;

/**
 * Supplies the docker host from the system property
 * {@value net.wouterdanes.docker.provider.RemoteDockerProvider#DOCKER_HOST_PROPERTY}
 */
public final class DockerPortFromPropertySupplier implements Supplier> {

    public static final DockerPortFromPropertySupplier INSTANCE = new DockerPortFromPropertySupplier();

    private DockerPortFromPropertySupplier() {    }

    @Override
    public Optional get() {
        Optional port = Optional.fromNullable(System.getProperty(RemoteDockerProvider.DOCKER_PORT_PROPERTY));
        return port.isPresent() ? Optional.of(Integer.valueOf(port.get())) : Optional.absent();
    }
}