/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.wildfly.security.auth.util;

import org.wildfly.common.Assert;
import org.wildfly.security.auth.server.NameRewriter;

/**
 * A delegating name rewriter with a mutable delegation target.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
public final class MutableNameRewriter implements NameRewriter {
    private volatile NameRewriter target = IDENTITY_REWRITER;

    /**
     * Construct a new instance.
     *
     * @param target the target rewriter (not {@code null})
     */
    public MutableNameRewriter(final NameRewriter target) {
        Assert.checkNotNullParam("target", target);
        this.target = target;
    }

    /**
     * Construct a new instance with the identity rewriter.
     */
    public MutableNameRewriter() {
    }

    public String rewriteName(final String original) {
        return target.rewriteName(original);
    }

    /**
     * Set the target rewriter.
     *
     * @param target the target rewriter (not {@code null})
     */
    public void setTarget(final NameRewriter target) {
        Assert.checkNotNullParam("target", target);
        this.target = target;
    }
}
