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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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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.chart;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.component.chart.renderer.BarRenderer;
import org.primefaces.component.chart.renderer.BasePlotRenderer;
import org.primefaces.component.chart.renderer.DonutRenderer;
import org.primefaces.component.chart.renderer.LineRenderer;
import org.primefaces.component.chart.renderer.OhlcRenderer;
import org.primefaces.component.chart.renderer.PieRenderer;
import org.primefaces.component.chart.renderer.BubbleRenderer;
import org.primefaces.component.chart.renderer.MeterGaugeRenderer;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.WidgetBuilder;

public class ChartRenderer extends CoreRenderer {

    private static final String TYPE_PIE = "pie";
    private static final String TYPE_LINE = "line";
    private static final String TYPE_BAR = "bar";
    private static final String TYPE_OHLC = "ohlc";
    private static final String TYPE_DONUT = "donut";
    private static final String TYPE_BUBBLE = "bubble";
    private static final String TYPE_METERGAUGE = "metergauge";

    private static final Map CHART_RENDERERS;

    static {
        CHART_RENDERERS = new HashMap();
        CHART_RENDERERS.put(TYPE_PIE, new PieRenderer());
        CHART_RENDERERS.put(TYPE_LINE, new LineRenderer());
        CHART_RENDERERS.put(TYPE_BAR, new BarRenderer());
        CHART_RENDERERS.put(TYPE_OHLC, new OhlcRenderer());
        CHART_RENDERERS.put(TYPE_DONUT, new DonutRenderer());
        CHART_RENDERERS.put(TYPE_BUBBLE, new BubbleRenderer());
        CHART_RENDERERS.put(TYPE_METERGAUGE, new MeterGaugeRenderer());
    }

    @Override
    public void decode(FacesContext context, UIComponent component) {
        super.decodeBehaviors(context, component);
    }

    @Override
    public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
        Chart chart = (Chart) component;

        encodeMarkup(context, chart);
        encodeScript(context, chart);
    }

    protected void encodeMarkup(FacesContext context, Chart chart) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        String style = chart.getStyle();
        String styleClass = chart.getStyleClass();

        writer.startElement("div", null);
        writer.writeAttribute("id", chart.getClientId(context), null);
        if (style != null) writer.writeAttribute("style", style, "style");
        if (styleClass != null) writer.writeAttribute("class", styleClass, "styleClass");

        writer.endElement("div");
    }

    protected void encodeScript(FacesContext context, Chart chart) throws IOException {
        String type = chart.getType();
        BasePlotRenderer plotRenderer = CHART_RENDERERS.get(type);
        String clientId = chart.getClientId(context);

        WidgetBuilder wb = getWidgetBuilder(context);
        wb.initWithDomReady("Chart", chart.resolveWidgetVar(), clientId)
            .attr("type", type);
        
        if (chart.isResponsive()) wb.attr("responsive", true);

        plotRenderer.render(context, chart);
        encodeClientBehaviors(context, chart);
        
        wb.finish();
    }
}