net.fortytwo.sesametools.SingleContextSail Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of common Show documentation
Common utilities for Sesametools
The newest version!
package net.fortytwo.sesametools;

import org.openrdf.model.Resource;
import org.openrdf.model.ValueFactory;
import org.openrdf.sail.Sail;
import org.openrdf.sail.SailConnection;
import org.openrdf.sail.SailException;
import org.openrdf.sail.StackableSail;
import org.openrdf.sail.helpers.AbstractSail;

import java.io.File;

/**
 * A Sail which treats the wildcard context as a single, specific context,
 * and disallows read and write access to all other contexts, including the default context.
 * Namespaces may be set and retrieved without restriction.
 *
 * @author Joshua Shinavier (http://fortytwo.net)
 */
public class SingleContextSail extends AbstractSail implements StackableSail {
    private Sail baseSail;
    private Resource context;

    /**
     * Construct a Sail which is restricted to a single graph context.
     * @param baseSail a base Sail for storage
     * @param context a single, non-null graph context
     */
    public SingleContextSail(final Sail baseSail, final Resource context) {
        this.baseSail = baseSail;
        this.context = context;

        if (null == context) {
            throw new IllegalArgumentException("context may not be null");
        }
    }

    public Sail getBaseSail() {
        return baseSail;
    }

    public void setBaseSail(final Sail baseSail) {
        this.baseSail = baseSail;
    }

    protected SailConnection getConnectionInternal() throws SailException {
        return new SingleContextSailConnection(this, baseSail, context);
    }

    @Override
    public File getDataDir() {
        return baseSail.getDataDir();
    }

    public ValueFactory getValueFactory() {
        return baseSail.getValueFactory();
    }

    protected void initializeInternal() throws SailException {
        baseSail.initialize();
    }

    @Override
    public boolean isWritable() throws SailException {
        return baseSail.isWritable();
    }

    @Override
    public void setDataDir(final File dir) {
        baseSail.setDataDir(dir);
    }

    protected void shutDownInternal() throws SailException {
        baseSail.shutDown();
    }
}