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eXist-db NoSQL Database Core
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/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.xmldb;

import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;

import org.xmldb.api.base.XMLDBException;

/**
 * An extension to BinaryResource interface, which adds the
 * common methods needed by LocalBinaryResource and RemoteBinaryResource,
 * so they can be streamlined.
 *
 * @author jmfernandez
 */
public interface ExtendedResource {

    /**
     * It returns an object representing the content, in the representation
     * which needs less memory.
     *
     * @return the content.
     *
     * @throws XMLDBException if an error occurs whilst retriveing the extended content.
     */
    Object getExtendedContent() throws XMLDBException;

    /**
     * It returns an stream to the content, whichever it is its origin.
     *
     * @return the content.
     *
     * @throws XMLDBException if an error occurs whilst streaming the content.
     */
    InputStream getStreamContent() throws XMLDBException;

    /**
     * It returns the length of the content, if known.
     *
     * @return The content length, or -1 if not known.
     *
     * @throws XMLDBException if an error occurs whilst getting the stream's length.
     */
    long getStreamLength() throws XMLDBException;

    /**
     * It saves the resource to the local file given as input parameter.
     * Do NOT confuse with set content.
     *
     * @param localfile the file.
     *
     * @throws XMLDBException if an error occurs whilst getting the content.
     */
    void getContentIntoAFile(Path localfile) throws XMLDBException;

    /**
     * It saves the resource to the local stream given as input parameter.
     * Do NOT confuse with set content.
     *
     * @param os the stream.
     *
     * @throws XMLDBException if an error occurs whilst getting the content.
     */
    void getContentIntoAStream(OutputStream os) throws XMLDBException;
}