// MimeTypeArrayAttribute.java
// $Id: MimeTypeArrayAttribute.java,v 1.4 2000/08/16 21:37:56 ylafon Exp $
// (c) COPYRIGHT MIT, INRIA and Keio, 1999.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.tools.resources.upgrade ;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.w3c.www.mime.MimeType;
import org.w3c.www.mime.MimeTypeFormatException;
/**
 * @version $Revision: 1.4 $
 * @author  Benoît Mahé (bmahe@w3.org)
 */
public class MimeTypeArrayAttribute extends StringArrayAttribute {

    public static String[] toStringArray(Object array) {
	if (array == null)
	    return null;
	if (array instanceof String[])
	    return (String[]) array;
	else if (array instanceof MimeType[]) {
	    MimeType mimes[] = (MimeType[]) array;
	    String strArray [] = new String[mimes.length];
	    for (int i = 0 ; i < mimes.length ; i++)
		strArray[i] = mimes[i].toString();
	    return strArray;
	} else
	    return null;
    }

    /**
     * Is the given object a valid MimeTypeArrayAttribute value ?
     * @param obj The object to test.
     * @return A boolean <strong>true</strong> if okay.
     */

    public boolean checkValue(Object obj) {
	return ((obj instanceof MimeType[]) || (obj instanceof String[]));
    }

    /**
     * Get the number of bytes required to save that attribute value.
     * @param The value about to be pickled.
     * @return The number of bytes needed to pickle that value.
     */
    public int getPickleLength(Object value) {
	return super.getPickleLength(toStringArray(value));
    }

    /**
     * Pickle a String array to the given output stream.
     * @param out The output stream to pickle to.
     * @param obj The object to pickle.
     * @exception IOException If some IO error occured.
     */

    public void pickle(DataOutputStream out, Object sa) 
	throws IOException
    {
	super.pickle(out, toStringArray(sa));
    }

    /**
     * Unpickle an MimeType array from the given input stream.
     * @param in The input stream to unpickle from.
     * @return An instance of MimeType[].
     * @exception IOException If some IO error occured.
     */

    public Object unpickle (DataInputStream in) 
	throws IOException
    {
	int    cnt       = in.readInt() ;
	MimeType mimes[] = new MimeType[cnt] ;
	for (int i = 0 ; i < cnt ; i++) {
	    try {
		mimes[i] = new MimeType(in.readUTF()) ;
	    } catch (MimeTypeFormatException ex) {
		mimes[i] = null;
	    }
	}
	return mimes ;
    }

    public MimeTypeArrayAttribute(String name, MimeType def[],
                                  Integer flags) {
	super(name, toStringArray(def), flags);
	this.type = "[Lorg.w3c.www.mime.MimeType;";
    }
}
