jp.xet.uncommons.spring.CompositeSaltSource.java Source code

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Here is the source code for jp.xet.uncommons.spring.CompositeSaltSource.java

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/*
 * Copyright 2011 Daisuke Miyamoto.
 * Created on 2011/10/07
 *
 * 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 jp.xet.uncommons.spring;

import org.springframework.security.authentication.dao.SaltSource;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.util.Assert;

/**
 * ? {@link SaltSource} ????
 * 
 * <p>?{@link SaltSource}?salt??? {@link Object#toString() toString()}????
 * {@code separator}??????</p>
 * 
 * @since 1.1
 * @version $Id: CompositeSaltSource.java 201 2012-02-04 00:42:19Z daisuke $
 * @author daisuke
 */
public class CompositeSaltSource implements SaltSource {

    private final SaltSource[] sources;

    private final String separator;

    /**
     * ??
     * 
     * @param sources array of {@link SaltSource}
     * @throws IllegalArgumentException {@code sources}?{@code null}???
     */
    public CompositeSaltSource(SaltSource[] sources) {
        this(sources, null);
    }

    /**
     * ??
     * 
     * @param sources array of {@link SaltSource}
     * @param separator the separator character to use, {@code null} treated as ""
     * @throws IllegalArgumentException {@code sources}?{@code null}???
     */
    public CompositeSaltSource(SaltSource[] sources, String separator) {
        Assert.noNullElements(sources);
        this.sources = sources.clone();
        this.separator = separator == null ? "" : separator;
    }

    @Override
    public Object getSalt(UserDetails user) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < sources.length; i++) {
            if (i > 0) {
                sb.append(separator);
            }
            sb.append(sources[i].getSalt(user));
        }
        return sb.toString();
    }
}