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package org.ietf.ldap.controls;

import org.ietf.ldap.LDAPControl;

/**
 * Represents an LDAP v3 server control that contains a string as its
 * only value. This is to be used as a base class by real such controls.
 */
abstract class LDAPStringControl extends LDAPControl {
    protected String m_msg = null;

    LDAPStringControl() {
      super();
    }

    /**
     * Constructs an <CODE>LDAPStringControl</CODE> object, and stores the 
     * value as a string. To retrieve this string value, use 
     * <CODE>getMsg()</CODE>.
     * @param oid the oid of this control
     * @param critical <code>true</code> if this control is critical to the search
     * @param value the value associated with this control
     * @see org.ietf.ldap.LDAPcontrol
     */
    public LDAPStringControl( String oid, boolean critical, byte[] value ) {
        super( oid, critical, value );
	
	if ( value != null ) {
	    try {  
	        m_msg = new String( value, "UTF8" );
	    } catch ( java.io.IOException e ) {
	    }
	}
    }

    /**
     * Parses a response control sent by the server and
     * retrieves a string.
     * <P>
     *
     * You can get the controls returned by the server by using the
     * <CODE>getResponseControls</CODE> method of the
     * <CODE>LDAPConnection</CODE> class.
     * <P>
     *
     * @param controls an array of <CODE>LDAPControl</CODE> objects,
     * representing the controls returned by the server
     * after a search. To get these controls, use the
     * <CODE>getResponseControls</CODE> method of the
     * <CODE>LDAPConnection</CODE> class.
     * @param type the OID of the control to look for
     * @return a message string, or null if the server did
     * not return a string.
     * @see org.ietf.ldap.LDAPConnection#getResponseControls
     */
    public static String parseResponse( LDAPControl[] controls, String type ) {
        String msg = null;
        LDAPControl cont = null;
        /* See if there is a password control in the array */
        for( int i = 0; (controls != null) && (i < controls.length); i++ ) {
            if ( controls[i].getID().equals( type ) ) {
                cont = controls[i];
                break;
            }
        }
        if ( cont != null ) {
            /* Suck out the data and return it */
            try {
                msg = new String( cont.getValue(), "UTF8" );
            } catch ( Exception e ) {
            }
        }
        return msg;
    }
}