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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * 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 org.primefaces.component.steps;

import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.component.api.AjaxSource;
import org.primefaces.component.api.UIOutcomeTarget;

import org.primefaces.component.menu.AbstractMenu;
import org.primefaces.component.menu.BaseMenuRenderer;
import org.primefaces.model.menu.MenuElement;
import org.primefaces.model.menu.MenuItem;
import org.primefaces.util.ComponentTraversalUtils;

public class StepsRenderer extends BaseMenuRenderer {

    @Override
    protected void encodeMarkup(FacesContext context, AbstractMenu abstractMenu) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        Steps steps = (Steps) abstractMenu;
        String clientId = steps.getClientId(context);
        String styleClass = steps.getStyleClass();
        String containerClass = steps.isReadonly() ? Steps.READONLY_CONTAINER_CLASS : Steps.CONTAINER_CLASS;
        styleClass = styleClass == null ? containerClass : containerClass + " " + styleClass;
        int activeIndex = steps.getActiveIndex();
        List elements = steps.getElements();

        writer.startElement("div", steps);
        writer.writeAttribute("id", clientId, null);
        writer.writeAttribute("class", styleClass, "styleClass");
        if (steps.getStyle() != null) {
            writer.writeAttribute("style", steps.getStyle(), "style");
        }

        writer.startElement("ul", null);
        writer.writeAttribute("role", "tablist", null);

        int i = 0;
        if (elements != null && !elements.isEmpty()) {
            for (MenuElement element : elements) {
                if (element.isRendered() && (element instanceof MenuItem)) {
                    encodeItem(context, steps, (MenuItem) element, activeIndex, i);
                    i++;
                }
            }
        }

        writer.endElement("ul");

        writer.endElement("div");
    }

    protected void encodeItem(FacesContext context, Steps steps, MenuItem item, int activeIndex, int index) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        String itemClass;

        if (steps.isReadonly()) {
            itemClass = (index == activeIndex) ? Steps.ACTIVE_ITEM_CLASS : Steps.INACTIVE_ITEM_CLASS;
        }
        else {
            if (index == activeIndex) {
                itemClass = Steps.ACTIVE_ITEM_CLASS;
            }
            else if (index < activeIndex) {
                itemClass = Steps.VISITED_ITEM_CLASS;
            }
            else {
                itemClass = Steps.INACTIVE_ITEM_CLASS;
            }
        }

        String containerStyle = item.getContainerStyle();
        String containerStyleClass = item.getContainerStyleClass();

        if (containerStyleClass != null) {
            itemClass = itemClass + " " + containerStyleClass;
        }

        //header container
        writer.startElement("li", null);
        writer.writeAttribute("class", itemClass, null);
        writer.writeAttribute("role", "tab", null);
        if (containerStyle != null) {
            writer.writeAttribute("style", containerStyle, null);
        }

        encodeMenuItem(context, steps, item, activeIndex, index);

        writer.endElement("li");
    }

    protected void encodeMenuItem(FacesContext context, Steps steps, MenuItem menuitem, int activeIndex, int index) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        String title = menuitem.getTitle();
        String style = menuitem.getStyle();
        String styleClass = this.getLinkStyleClass(menuitem);

        writer.startElement("a", null);
        writer.writeAttribute("tabindex", "-1", null);
        if (shouldRenderId(menuitem)) {
            writer.writeAttribute("id", menuitem.getClientId(), null);
        }
        if (title != null) {
            writer.writeAttribute("title", title, null);
        }

        writer.writeAttribute("class", styleClass, null);

        if (style != null) {
            writer.writeAttribute("style", style, null);
        }

        if (steps.isReadonly() || menuitem.isDisabled() || (activeIndex <= index)) {
            writer.writeAttribute("href", "#", null);
            writer.writeAttribute("onclick", "return false;", null);
        }
        else {
            String onclick = menuitem.getOnclick();

            //GET
            if (menuitem.getUrl() != null || menuitem.getOutcome() != null) {
                String targetURL = getTargetURL(context, (UIOutcomeTarget) menuitem);
                writer.writeAttribute("href", targetURL, null);

                if (menuitem.getTarget() != null) {
                    writer.writeAttribute("target", menuitem.getTarget(), null);
                }
            }
            //POST
            else {
                writer.writeAttribute("href", "#", null);

                UIComponent form = ComponentTraversalUtils.closestForm(context, steps);
                if (form == null) {
                    throw new FacesException("MenuItem must be inside a form element");
                }

                String command;
                if (menuitem.isDynamic()) {
                    String menuClientId = steps.getClientId(context);
                    Map> params = menuitem.getParams();
                    if (params == null) {
                        params = new LinkedHashMap>();
                    }
                    List idParams = new ArrayList();
                    idParams.add(menuitem.getId());
                    params.put(menuClientId + "_menuid", idParams);

                    command = menuitem.isAjax()
                            ? buildAjaxRequest(context, steps, (AjaxSource) menuitem, form, params)
                            : buildNonAjaxRequest(context, steps, form, menuClientId, params, true);
                }
                else {
                    command = menuitem.isAjax()
                            ? buildAjaxRequest(context, (AjaxSource) menuitem, form) 
                            : buildNonAjaxRequest(context, ((UIComponent) menuitem), form, ((UIComponent) menuitem).getClientId(context), true);
                }

                onclick = (onclick == null) ? command : onclick + ";" + command;
            }

            if (onclick != null) {
                writer.writeAttribute("onclick", onclick, null);
            }
        }

        writer.startElement("span", steps);
        writer.writeAttribute("class", Steps.STEP_NUMBER_CLASS, null);
        writer.writeText((index + 1), null);
        writer.endElement("span");

        Object value = menuitem.getValue();
        if (value != null) {
            writer.startElement("span", steps);
            writer.writeAttribute("class", Steps.STEP_TITLE_CLASS, null);
            writer.writeText(value, null);
            writer.endElement("span");
        }

        writer.endElement("a");
    }

    @Override
    public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
        // Do nothing
    }

    @Override
    protected void encodeScript(FacesContext context, AbstractMenu abstractMenu) throws IOException {
        //no widget
    }

}




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