/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * // Copyright 2006-2007 Sun Microsystems, Inc. All rights reserved.
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 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
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package oracle.toplink.essentials.ejb.cmp3.persistence;

import java.util.Iterator;
import java.io.InputStream;
import java.io.IOException;
import java.net.URL;

/**
 * Provides an abstraction to deal with various kinds of URLs that can
 * be returned by
 * {@link javax.persistence.spi.PersistenceUnitInfo#getPersistenceUnitRootUrl()}
 *
 * @see ArchiveFactoryImpl
 * @author Sanjeeb.Sahoo@Sun.COM
 */
public interface Archive {
    /*
     * Implementation Note: This class does not have any dependency on TopLink
     * or GlassFish implementation classes. Please retain this searation.
     */

    /**
     * Returns an {@link java.util.Iterator} of the file entries. Each String represents
     * a file name relative to the root of the module.
     */
    Iterator<String> getEntries();

    /**
     * Returns the InputStream for the given entry name. Returns null if no such
     * entry exists. The entry name must be relative to the root of the module.
     *
     * @param entryPath the file name relative to the root of the module.
     * @return the InputStream for the given entry name or null if not found.
     */
    InputStream getEntry(String entryPath) throws IOException;

    /**
     * Returns the URL for the given entry name. Returns null if no such
     * entry exists. The entry name must be relative to the root of the module.
     *
     * @param entryPath the file name relative to the root of the module.
     * @return the URL for the given entry name or null if not found.
     */
    URL getEntryAsURL(String entryPath) throws IOException;

    /**
     * @return the URL that this archive represents.
     */
    URL getRootURL();
}