/*
 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.util.spi;

import java.util.Properties;
import java.util.InvalidPropertiesFormatException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

/**
 * Service-provider class for loading and storing {@link Properites} in XML
 * format.
 *
 * @see Properties#loadFromXML
 * @see Properties#storeToXML
 */

public abstract class XmlPropertiesProvider {

    /**
     * Initializes a new instance of this class.
     */
    protected XmlPropertiesProvider() {
        // do nothing for now
    }

    /**
     * Loads all of the properties represented by the XML document on the
     * specified input stream into a properties table.
     *
     * @param props the properties table to populate
     * @param in the input stream from which to read the XML document
     * @throws IOException if reading from the specified input stream fails
     * @throws java.io.UnsupportedEncodingException if the document's encoding
     *         declaration can be read and it specifies an encoding that is not
     *         supported
     * @throws InvalidPropertiesFormatException Data on input stream does not
     *         constitute a valid XML document with the mandated document type.
     *
     * @see Properties#loadFromXML
     */
    public abstract void load(Properties props, InputStream in)
        throws IOException, InvalidPropertiesFormatException;

    /**
     * Emits an XML document representing all of the properties in a given
     * table.
     *
     * @param props the properies to store
     * @param out the output stream on which to emit the XML document.
     * @param comment  a description of the property list, can be @{code null}
     * @param encoding the name of a supported character encoding
     *
     * @throws IOException if writing to the specified output stream fails
     * @throws java.io.UnsupportedEncodingException if the encoding is not
     *         supported by the implementation
     * @throws NullPointerException if {@code out} is null.
     * @throws ClassCastException  if this {@code Properties} object
     *         contains any keys or values that are not
     *         {@code Strings}.
     *
     * @see Properties#storeToXML
     */
    public abstract void store(Properties props, OutputStream out,
                               String comment, String encoding)
        throws IOException;
}