Dispatcher.java

/*
 * Dispatcher.java
 * Copyright (C) 2011,2012 Wannes De Smet
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.xenmaster.controller;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections.CollectionUtils;
import org.xenmaster.connectivity.Connections;

/**
 * 
 * @created Oct 2, 2011
 * @author double-u
 */
public class Dispatcher {

    protected Connections conn;

    public Dispatcher(URL xen) {
        this.conn = new Connections(xen);
    }

    public Dispatcher(Connections conn) {
        this.conn = conn;
    }

    public Object dispatch(String methodName, Object[] params) throws BadAPICallException {
        return dispatch(methodName, params, 0);
    }

    public Object dispatch(String methodName, Object[] params, int connection) throws BadAPICallException {
        ArrayList list = new ArrayList();
        CollectionUtils.addAll(list, params);

        return execute(methodName, list, connection);
    }

    protected Object execute(String methodName, List params, int connection) throws BadAPICallException {
        // Preflight check
        for (Object o : params) {
            if (o == null) {
                throw new BadAPICallException(methodName, params, "Illegal argument", "A null argument has been passed");
            }
        }

        Map result = this.conn.executeCommand(methodName, params, connection);
        if (result == null) {
            throw new BadAPICallException(methodName, params);
        }

        switch (result.get("Status").toString()) {
            case "Success":
                return result.get("Value");
            case "Failure":
                Object[] info = (Object[]) result.get("ErrorDescription");
                ArrayList<String> errInfo = new ArrayList<>();
                for (Object o : info) {
                    if (o instanceof String) {
                        errInfo.add((String) o);
                    }
                }

                throw new BadAPICallException(methodName, params, errInfo.get(0), errInfo);
            default:
                return null;
        }
    }

    public Object dispatchWithSession(String methodName, Object[] params) throws BadAPICallException {
        return dispatchWithSession(methodName, params, 0);
    }

    public Object dispatchWithSession(String methodName, Object[] params, int connection) throws BadAPICallException {
        if (conn.getSession().getReference() == null) {
            throw new Error("Session has not been initialized");
        }
        ArrayList list = new ArrayList();
        list.add(conn.getSession().getReference());
        CollectionUtils.addAll(list, params);

        return execute(methodName, list, connection);
    }

    public Connections getConnections() {
        return conn;
    }
}