OutputLabelRenderer.java

/*
 * Copyright 2009-2014 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.outputlabel;

import java.io.IOException;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.component.api.InputHolder;
import org.primefaces.expression.SearchExpressionFacade;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.ComponentUtils;
import org.primefaces.util.HTML;

public class OutputLabelRenderer extends CoreRenderer {

    @Override
    public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        OutputLabel label = (OutputLabel) component;
        String clientId = label.getClientId();
        String value = ComponentUtils.getValueToRender(context, label);
        UIComponent target = null;
        String targetClientId = null;
        UIInput input = null;
        String styleClass = label.getStyleClass();
        styleClass = styleClass == null ? OutputLabel.STYLE_CLASS : OutputLabel.STYLE_CLASS + " " + styleClass;
        
        String _for = label.getFor();

        if(_for != null) {
            target = SearchExpressionFacade.resolveComponent(context, label, _for);
            targetClientId = (target instanceof InputHolder) ? ((InputHolder) target).getInputClientId() : target.getClientId(context);
            
            if(target instanceof UIInput) {
                input = (UIInput) target;
                
                if(value != null && (input.getAttributes().get("label") == null || input.getValueExpression("label") == null)) {
                    ValueExpression ve = label.getValueExpression("value");
                    
                    if(ve != null) {
                        input.setValueExpression("label", ve);
                    }
                    else {
                        String labelString = value;
                        int colonPos = labelString.lastIndexOf(":");
                        
                        if(colonPos != -1) {
                            labelString = labelString.substring(0, colonPos);
                        }
                        
                        input.getAttributes().put("label", labelString);
                    }
                }
                
                if(!input.isValid()) {
                    styleClass = styleClass + " ui-state-error";
                }
            }
        }

        writer.startElement("label", label);
        writer.writeAttribute("id", clientId, "id");
        writer.writeAttribute("class", styleClass, "id");
        renderPassThruAttributes(context, label, HTML.LABEL_ATTRS);
        
        if(target != null) {
            writer.writeAttribute("for", targetClientId, "for");
        }
        
        if(value != null) {            
            if(label.isEscape())
                writer.writeText(value, "value");
            else
                writer.write(value);
        }
        
        renderChildren(context, label);
        
        if(input != null && input.isRequired()) {
            writer.startElement("span", label);
            writer.writeAttribute("class", OutputLabel.REQUIRED_FIELD_INDICATOR_CLASS, null);
            writer.write("*");
            writer.endElement("span");   
        }
        
        writer.endElement("label");        
    }
    
    @Override
    public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
        //Do nothing
    }

    @Override
    public boolean getRendersChildren() {
        return true;
    }
}