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package javax.xml.bind;

import javax.xml.transform.Result;

import java.io.IOException;

/**

 * Controls where a JAXB implementation puts the generates

 * schema files.

 *

 * <p>

 * An implementation of this abstract class has to be provided by the calling

 * application to generate schemas.

 *

 * <p>

 * This is a class, not an interface so as to allow future versions to evolve

 * without breaking the compatibility.

 *

 * @author

 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)

 */

public abstract class SchemaOutputResolver {

    /**

     * Decides where the schema file (of the given namespace URI)

     * will be written, and return it as a {@link Result} object.

     *

     * <p>

     * This method is called only once for any given namespace.

     * IOW, all the components in one namespace is always written

     * into the same schema document.

     *

     * @param namespaceUri

     *      The namespace URI that the schema declares.

     *      Can be the empty string, but never be null.

     * @param suggestedFileName

     *      A JAXB implementation generates an unique file name (like "schema1.xsd")

     *      for the convenience of the callee. This name can be

     *      used for the file name of the schema, or the callee can just

     *      ignore this name and come up with its own name.

     *      This is just a hint.

     *

     * @return

     *      a {@link Result} object that encapsulates the actual destination

     *      of the schema.

     *

     *      If the {@link Result} object has a system ID, it must be an

     *      absolute system ID. Those system IDs are relativized by the caller and used

     *      for <xs:import> statements.

     *

     *      If the {@link Result} object does not have a system ID, a schema

     *      for the namespace URI is generated but it won't be explicitly

     *      <xs:import>ed from other schemas.

     *

     *      If {@code null} is returned, the schema generation for this

     *      namespace URI will be skipped.

     */

    public abstract Result createOutput( String namespaceUri, String suggestedFileName ) throws IOException;

}