/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 */
package org.apache.commons.lang;

import java.util.Arrays;

/**
 * <p>Thrown to indicate an incomplete argument to a method.</p>
 * 
 * @author Matthew Hawthorne
 * @since 2.0
 * @version $Id: IncompleteArgumentException.java,v 1.4 2003/08/18 02:22:23 bayard Exp $
 */
public class IncompleteArgumentException extends IllegalArgumentException {

    /**
     * <p>Instantiates with the specified description.</p>
     * 
     * @param argName  a description of the incomplete argument
     */
    public IncompleteArgumentException(String argName) {
        super(argName + " is incomplete.");
    }

    /**
     * <p>Instantiates with the specified description.</p>
     * 
     * @param argName  a description of the incomplete argument
     * @param items  an array describing the arguments missing
     */
    public IncompleteArgumentException(String argName, String[] items) {
        super(
            argName
                + " is missing the following items: "
                + safeArrayToString(items));
    }

    /**
     * <p>7Converts an array to a string without throwing an exception.</p>
     * 
     * @param array  an array
     * @return the array as a string
     */
    private static final String safeArrayToString(Object[] array) {
        return array == null ? null : Arrays.asList(array).toString();
    }

}