Append.java

//
// Copyright 2009 Robin Komiwes, Bruno Verachten, Christophe Cordenier
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

package com.wooki.mixins;

import java.util.List;

import org.apache.tapestry5.BindingConstants;
import org.apache.tapestry5.ComponentResources;
import org.apache.tapestry5.EventConstants;
import org.apache.tapestry5.Link;
import org.apache.tapestry5.annotations.AfterRender;
import org.apache.tapestry5.annotations.BindParameter;
import org.apache.tapestry5.annotations.InjectContainer;
import org.apache.tapestry5.annotations.MixinAfter;
import org.apache.tapestry5.annotations.OnEvent;
import org.apache.tapestry5.annotations.Parameter;
import org.apache.tapestry5.corelib.components.Form;
import org.apache.tapestry5.internal.services.PartialMarkupDocumentLinker;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.json.JSONObject;
import org.apache.tapestry5.runtime.Component;
import org.apache.tapestry5.services.AssetSource;
import org.apache.tapestry5.services.Request;
import org.apache.tapestry5.services.javascript.InitializationPriority;
import org.apache.tapestry5.services.javascript.JavaScriptSupport;
import org.apache.tapestry5.services.javascript.StylesheetLink;

/**
 * Append content instead of replacing it.
 * 
 * @author ccordenier
 */
@MixinAfter
public class Append
{

    /** Insert Position */
    @Parameter(value = "bottom", defaultPrefix = BindingConstants.LITERAL)
    private String position;

    /** Client id of element to append result */
    @Parameter(required = true, allowNull = false, defaultPrefix = BindingConstants.LITERAL)
    private String to;

    @BindParameter
    private Object[] context;

    @Inject
    private AssetSource assetSource;

    @Inject
    private JavaScriptSupport javascriptSupport;

    @Inject
    private Request request;

    @InjectContainer
    private Form form;

    /**
     * Submit the form via Ajax and handle result to append instead of replacing the whole content.
     */
    @AfterRender
    public void append()
    {
        ComponentResources formResources = Component.class.cast(form).getComponentResources();

        if (formResources.isBound("zone")) { throw new IllegalStateException(
                "'Append' mixin cannot be used if 'zone' parameter is set on form"); }
        // this should not be needed anymore
        /*
         * Object[] context = (Object[]) InternalComponentResources.class.cast(formResources
         * ).ggetParameterAccess("context").read(new Object[] {}.getClass());
         */
        Link link = formResources.createFormEventLink(EventConstants.ACTION, context);

        JSONObject params = new JSONObject();
        params.put("url", link.toURI());
        params.put("element", form.getClientId());
        params.put("to", to);
        params.put("position", position);

        javascriptSupport.addInitializerCall("appendToZone", params);
    }

    /**
     * Generate an errors message that will appear on the client side.
     * 
     * @return
     */
    @OnEvent(value = EventConstants.FAILURE)
    public Object checkErrors()
    {

        PartialMarkupDocumentLinker linker = new PartialMarkupDocumentLinker();
        linker.addStylesheetLink(new StylesheetLink(assetSource.getContextAsset(
                "context:/static/css/jquery.notifyBar.css",
                request.getLocale()).toClientURL()));
        linker.addScriptLink(assetSource.getContextAsset(
                "/static/js/jquery.notifyBar.js",
                request.getLocale()).toClientURL());
        linker.addScriptLink(assetSource.getContextAsset(
                "context:/static/js/notifybar.js",
                request.getLocale()).toClientURL());
        linker.addScriptLink(assetSource.getContextAsset(
                "/static/js/notifybar.js",
                request.getLocale()).toClientURL());

        JSONObject result = new JSONObject();
        StringBuffer buff = new StringBuffer();
        List<String> errors = form.getDefaultTracker().getErrors();
        if (!errors.isEmpty())
        {
            buff.append("<div class=\"error-list shadowed\">");
            buff.append("<ul class=\"error-list wrapper\">");
            for (String error : errors)
            {
                buff.append("<li>").append(error).append("</li>");
            }
            buff.append("</ul>");
            buff.append("</div>");
            result.put("errors", true);
        }
        else
        {
            buff.append("Unexcepted error");
            result.put("errors", true);
        }

        // Add error messages
        JSONObject html = new JSONObject();
        html.put("html", buff.toString());
        linker.addScript(InitializationPriority.LATE, String.format("Tapestry.Initializer.initErrorMessage(%s);", html
                .toString()));

        linker.commit(result);
        return result;
    }

}