ContainerProvider.java

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 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
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package org.dcm4chee.storage.spi;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.dcm4chee.storage.ContainerEntry;
import org.dcm4chee.storage.ExtractTask;
import org.dcm4chee.storage.RetrieveContext;
import org.dcm4chee.storage.StorageContext;
import org.dcm4chee.storage.conf.Container;

/**
 * This interface hides the details of the underlying storage container format from the
 * consumer; it presents the underlying storage container as a collection of individual
 * files that can be written to, extracted from, and randomly accessed from the
 * container without dealing directly with the container format.
 *
 * All storage systems in the group are imbued with the same group-level container
 * provider, so that all files stored to the same storage group will automatically have
 * the same format.
 *
 * @author Gunter Zeilinger<gunterze@gmail.com>
 *
 */
public interface ContainerProvider {

    public void init(Container container);

    void writeEntriesTo(StorageContext context, List<ContainerEntry> entries,
            OutputStream out) throws IOException;

    InputStream seekEntry(RetrieveContext ctx, String name, String entryName,
            InputStream in) throws IOException;

    void extractEntries(RetrieveContext ctx, String name,
            ExtractTask extractTask, InputStream in) throws IOException;
}