net.java.truevfs.comp.inst.InstrumentingCompositeDriver Maven / Gradle / Ivy

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Provides basic functionality for instrumenting the TrueVFS Kernel.

There is a newer version: 0.14.0

/*
 * Copyright (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truevfs.comp.inst;

import static java.util.Objects.requireNonNull;
import java.util.ServiceConfigurationError;
import javax.annotation.CheckForNull;
import javax.annotation.concurrent.Immutable;
import net.java.truevfs.kernel.spec.*;

/**
 * @param   the type of the mediator.
 * @author Christian Schlichtherle
 */
@Immutable
public class InstrumentingCompositeDriver>
implements FsCompositeDriver {

    protected final M mediator;
    protected final FsCompositeDriver driver;

    public InstrumentingCompositeDriver(
            final M mediator,
            final FsCompositeDriver driver) {
        this.mediator = requireNonNull(mediator);
        this.driver = requireNonNull(driver);
    }

    @Override
    public final FsModel newModel(
            FsManager context,
            FsMountPoint mountPoint,
            FsModel parent) {
        assert null == parent
                ? null == mountPoint.getParent()
                : parent.getMountPoint().equals(mountPoint.getParent());
        return mediator.instrument(this,
                driver.newModel(context, mountPoint, parent));
    }

    @Override
    public FsController newController(
            final FsManager context,
            final FsModel model,
            final @CheckForNull FsController parent)
    throws ServiceConfigurationError {
        assert null == parent
                    ? null == model.getParent()
                    : parent.getModel().equals(model.getParent());
        return mediator.instrument(this,
                driver.newController(context, model, parent));
    }

    @Override
    public String toString() {
        return String.format("%s[driver=%s]", getClass().getName(), driver);
    }
}