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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

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 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

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 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

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 * particular file as subject to the "Classpath" exception as provided

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 * The Original Software is NetBeans. The Initial Developer of the Original

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package org.apidesign.html.json.spi;

import java.io.IOException;

import java.io.OutputStream;

import net.java.html.BrwsrCtx;

import org.netbeans.html.json.impl.JSON;

import org.netbeans.html.json.impl.RcvrJSON;

/** Description of a JSON call request that is supposed to be processed

 * by {@link Transfer#loadJSON(org.apidesign.html.json.spi.JSONCall)} implementors.

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public final class JSONCall {

    private final RcvrJSON whenDone;

    private final String urlBefore;

    private final String urlAfter;

    private final String method;

    private final Object data;

    private final BrwsrCtx ctx;

    JSONCall(BrwsrCtx ctx, RcvrJSON whenDone, String urlBefore, String urlAfter, String method, Object data) {

        this.ctx = ctx;

        this.whenDone = whenDone;

        this.urlBefore = urlBefore;

        this.urlAfter = urlAfter;

        this.method = method;

        this.data = data;

    }

    /** Do we have some data to send? Can the {@link #writeData(java.io.OutputStream)} method be 

     * called?

     * 

     * @return true, if the call has some data to send

     */

    public boolean isDoOutput() {

        return this.data != null;

    }

    public void writeData(OutputStream os) throws IOException {

        if (this.data == null) {

            throw new IOException("No data!");

        }

        os.write(this.data.toString().getBytes("UTF-8"));

        os.flush();

    }

    public String getMethod() {

        return method;

    }

    public boolean isJSONP() {

        return urlAfter != null;

    }

    public String composeURL(String jsonpCallback) {

        if ((urlAfter == null) != (jsonpCallback == null)) {

            throw new IllegalStateException();

        }

        if (urlAfter != null) {

            return urlBefore + jsonpCallback + urlAfter;

        } else {

            return urlBefore;

        }

    }

    public void notifySuccess(Object result) {

        if (result == null) {

            dispatch(RcvrJSON.MsgEvnt.createOpen());

        } else {

            dispatch(RcvrJSON.MsgEvnt.createMessage(result));

        }

    }

    public void notifyError(Throwable error) {

        if (error == null) {

            dispatch(RcvrJSON.MsgEvnt.createClose());

        } else {

            dispatch(RcvrJSON.MsgEvnt.createError(error));

        }

    }

    private void dispatch(final RcvrJSON.MsgEvnt ev) {

        JSON.runInBrowser(ctx, new Runnable() {

            @Override

            public void run() {

                ev.dispatch(whenDone);

            }

        });

    }

    public String getMessage() {

        return this.data.toString();

    }

}