buttonrenderer.java

一个比较好的jsf spring hibernate的例子

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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 License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * and therefore, elected the GPL Version 2 license, then the option applies
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// ButtonRenderer.java

package renderkits.renderkit.xul;

import javax.faces.component.UICommand;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.event.ActionEvent;

import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;

import renderkits.util.Util;

/**
 * <B>ButtonRenderer</B> is a class that renders the current value of
 * <code>UICommand<code> as a Button.
 */

public class ButtonRenderer extends BaseRenderer {

    //
    // Protected Constants
    //

    //
    // Class Variables
    //
    private static final String FORM_HAS_COMMAND_LINK_ATTR =
          "com.sun.faces.FORM_HAS_COMMAND_LINK_ATTR";

    private static final String NO_COMMAND_LINK_FOUND_VALUE =
          "com.sun.faces.NO_COMMAND_LINK_FOUND";

    //
    // Instance Variables
    //

    // Attribute Instance Variables

    // Relationship Instance Variables

    //
    // Constructors and Initializers    
    //

    //
    // Class methods
    //

    //
    // General Methods
    //

    //
    // Methods From Renderer
    //

    public void decode(FacesContext context, UIComponent component) {
        if (context == null || component == null) {
            // PENDING - i18n
            throw new NullPointerException("'context' and/or 'component is null");
        }
        if (logger.isLoggable(Level.FINER)) {
            logger.log(Level.FINER,
                       "Begin decoding component " + component.getId());
        }

        // If the component is disabled, do not change the value of the
        // component, since its state cannot be changed.
        if (Util.componentIsDisabledOnReadonly(component)) {
            if (logger.isLoggable(Level.FINE)) {
                logger.fine("No decoding necessary since the component " +
                            component.getId() + " is disabled");
            }
            return;
        }

        // Was our command the one that caused this submission?
        String clientId = component.getClientId(context);
        Map<String, String> requestParameterMap = context.getExternalContext()
              .getRequestParameterMap();
        String value = requestParameterMap.get(clientId);
        if (value == null) {
            if (requestParameterMap.get(clientId + ".x") == null &&
                requestParameterMap.get(clientId + ".y") == null) {
                return;
            }
        }

        ActionEvent actionEvent = new ActionEvent(component);
        component.queueEvent(actionEvent);

        if (logger.isLoggable(Level.FINE)) {
            logger.fine("This command resulted in form submission " +
                        " ActionEvent queued " + actionEvent);
        }
        if (logger.isLoggable(Level.FINER)) {
            logger.log(Level.FINER,
                       "End decoding component " + component.getId());
        }
        return;
    }


    public void encodeBegin(FacesContext context, UIComponent component)
          throws IOException {
        if (context == null || component == null) {
            // PENDING - i18n
            throw new NullPointerException(
                  "'context' and/or 'component' is null");
        }
        if (logger.isLoggable(Level.FINER)) {
            logger.log(Level.FINER,
                       "Begin encoding component " + component.getId());
        }
        // suppress rendering if "rendered" property on the component is
        // false.
        if (!component.isRendered()) {
            if (logger.isLoggable(Level.FINER)) {
                logger.log(Level.FINER,
                           "End encoding component " + component.getId() +
                           " since rendered attribute is set to false ");
            }
            return;
        }

        ResponseWriter writer = context.getResponseWriter();

        // for text with rect positioning..
        int dxi = 0, dyi = 0, xi = 0, yi = 0, heighti = 0;

        String label = "";
        Object value = ((UICommand) component).getValue();
        if (value != null) {
            label = value.toString();
        }
        writer.startElement("button", component);
        writeIdAttributeIfNecessary(context, writer, component);
        writer.writeAttribute("label", label, "label");

        String type = (String) component.getAttributes().get("type");
        if (type != null && type.equals("submit")) {
            UIComponent root = context.getViewRoot();
            UIComponent myForm = component;
            while (!(myForm instanceof UIForm) && root != myForm) {
                myForm = myForm.getParent();
            }
            String formMethodName =
                  myForm.getClientId(context) + "_post(event)";
            writer.writeAttribute("onclick", formMethodName, "onclick");
        } else {
            String onclick = (String) component.getAttributes().get("onclick");
            if (onclick != null) {
                writer.writeAttribute("onclick", onclick, "onclick");
            }
        }
        writer.writeText("\n", null);


        if (logger.isLoggable(Level.FINER)) {
            logger.log(Level.FINER,
                       "End encoding component " + component.getId());
        }
    }

    public void encodeEnd(FacesContext context, UIComponent component)
          throws IOException {
        if (context == null || component == null) {
            // PENDING - i18n
            throw new NullPointerException(
                  "'context' and/or 'component' is null");
        }
        ResponseWriter writer = context.getResponseWriter();
        writer.endElement("button");
        writer.writeText("\n", null);
    }

    //
    // General Methods
    //

} // end of class ButtonRenderer