foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/internal/oxm/NamespacePrefixMapper.java

/*
 * Copyright (c) 2012, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Blaise Doughan - 2.5 - initial implementation
package org.eclipse.persistence.internal.oxm;

/**
 * <p><b>Purpose</b>:Provides a means to customise the namespace prefixes used while marshalling
 * An implementation of this class can be set on an instance of XMLMarshaller to allow for
 * each instance of XMLMarshaller to use different namespace prefixes.
 */
public abstract class NamespacePrefixMapper {

    /**
     * Default constructor.
     */
    protected NamespacePrefixMapper() {
    }

    /**
     * Returns a string array of prefixes and namespace uris that are already available in
     * this context. Only required when marshalling to an output stream or a writer, since
     * it's not possible to determine which namespaces are already in scope.
     */
    public String[] getContextualNamespaceDecls() {
        return new String[0];
    }

    /**
     * Returns a list of namespace uris that should be declared at the root of the xml
     * document being marshalled.
     */
    public String[] getPreDeclaredNamespaceUris() {
        return new String[0];
    }

    /**
     * Returns a string array of prefixes and namespace uris to be declared at the root of
     * the document. This eliminates the need of implementing both getPredeclaredNamespaceUris
     * and getPreferredPrefix since the prefix and uri can be associated here.
     */
    public String[] getPreDeclaredNamespaceUris2() {
        return new String[0];
    }

    public abstract String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix);

}