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package org.apache.catalina.realm;


import com.sun.org.apache.commons.digester.Digester;
import com.sun.org.apache.commons.digester.Rule;
import com.sun.org.apache.commons.digester.RuleSetBase;
import org.xml.sax.Attributes;


/**
 * <p><strong>RuleSet</strong> for recognizing the users defined in the
 * XML file processed by <code>MemoryRealm</code>.</p>
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.4 $ $Date: 2007/05/05 05:32:17 $
 */

public class MemoryRuleSet extends RuleSetBase {


    // ----------------------------------------------------- Instance Variables


    /**
     * The matching pattern prefix to use for recognizing our elements.
     */
    protected String prefix = null;


    // ------------------------------------------------------------ Constructor


    /**
     * Construct an instance of this <code>RuleSet</code> with the default
     * matching pattern prefix.
     */
    public MemoryRuleSet() {

        this("tomcat-users/");

    }


    /**
     * Construct an instance of this <code>RuleSet</code> with the specified
     * matching pattern prefix.
     *
     * @param prefix Prefix for matching pattern rules (including the
     *  trailing slash character)
     */
    public MemoryRuleSet(String prefix) {

        super();
        this.namespaceURI = null;
        this.prefix = prefix;

    }


    // --------------------------------------------------------- Public Methods


    /**
     * <p>Add the set of Rule instances defined in this RuleSet to the
     * specified <code>Digester</code> instance, associating them with
     * our namespace URI (if any).  This method should only be called
     * by a Digester instance.</p>
     *
     * @param digester Digester instance to which the new Rule instances
     *  should be added.
     */
    public void addRuleInstances(Digester digester) {

        digester.addRule
            (prefix + "user",
             new MemoryUserRule(digester));

    }


}


/**
 * Private class used when parsing the XML database file.
 */
final class MemoryUserRule extends Rule {


    /**
     * Construct a new instance of this <code>Rule</code>.
     *
     * @param digester The <code>Digester</code> we are associated with.
     */
    public MemoryUserRule(Digester digester) {

        super(digester);

    }


    /**
     * Process a <code><user></code> element from the XML database file.
     *
     * @param attributes The attribute list for this element
     */
    public void begin(Attributes attributes) throws Exception {

        String username = attributes.getValue("name");
        if (username == null) {
            username = attributes.getValue("username");
        }
        String password = attributes.getValue("password");
        String roles = attributes.getValue("roles");

        MemoryRealm realm =
            (MemoryRealm) digester.peek(digester.getCount() - 1);
        realm.addUser(username, password, roles);

    }


}