/*******************************************************************************
 * Copyright (c) 2006 Vlad Dumitrescu and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Vlad Dumitrescu
 *******************************************************************************/
package org.erlide.runtime.rpc;

import org.erlide.util.erlang.OtpErlang;

import com.ericsson.otp.erlang.OtpErlangAtom;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangString;
import com.ericsson.otp.erlang.OtpErlangTuple;

public class RpcResult {

    private static final OtpErlangAtom UNDEFINED = new OtpErlangAtom("undefined");

    private OtpErlangObject fValue;
    private boolean fOk = true;

    private RpcResult(final boolean ok) {
        fOk = ok;
        fValue = UNDEFINED;
    }

    public RpcResult(final OtpErlangObject res) {
        if (res instanceof OtpErlangTuple
                && ((OtpErlangTuple) res).elementAt(0) instanceof OtpErlangAtom
                && ("badrpc"
                        .equals(((OtpErlangAtom) ((OtpErlangTuple) res).elementAt(0))
                                .atomValue())
                        || "EXIT".equals(
                                ((OtpErlangAtom) ((OtpErlangTuple) res).elementAt(0))
                                        .atomValue()))) {
            fOk = false;
            fValue = ((OtpErlangTuple) res).elementAt(1);
        } else {
            fOk = true;
            fValue = res;
        }

    }

    public boolean isOk() {
        return fOk;
    }

    public OtpErlangObject getValue() {
        return fValue;
    }

    @Override
    public String toString() {
        return "RPC:" + fOk + "=" + fValue.toString();
    }

    public static RpcResult error(final String msg) {
        final RpcResult r = new RpcResult(false);
        r.fValue = OtpErlang.mkTuple(new OtpErlangAtom("error"),
                new OtpErlangString(msg));
        return r;
    }
}