org.apache.struts.faces.component.FormComponent Maven / Gradle / Ivy
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* $Id$
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.struts.faces.component;
import java.util.Map;
import javax.el.ValueExpression;
import javax.faces.component.UIForm;
import javax.faces.context.FacesContext;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.DynaActionFormClass;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.config.FormBeanConfig;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.faces.util.StrutsContext;
import org.apache.struts.faces.util.Utils;
import org.apache.struts.util.RequestUtils;
/**
* FormComponent is a specialized subclass of
* javax.faces.component.UIForm that supports automatic
* creation of form beans in request or session scope.
*
* @version $Rev$ $Date$
*/
public class FormComponent extends UIForm {
// -------------------------------------------------------- Static Variables
/**
* The {@code LOG} instance for this class.
*/
protected static Log log = LogFactory.getLog(FormComponent.class);
// ------------------------------------------------------ Instance Variables
private String action;
private String enctype;
private String focus;
private String focusIndex;
private String onreset;
private String onsubmit;
private String style;
private String styleClass;
private String target;
// ---------------------------------------------------- Component Properties
/**
* Return the Struts action path to which this form should be submitted.
*
*/
public String getAction() {
if (this.action != null) {
return (this.action);
}
ValueExpression vb = getValueExpression("action");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the Struts action to which this form should be submitted.
*
* @param action The new action path
*/
public void setAction(String action) {
this.action = action;
}
/**
* Return the encoding type for this form submit.
*/
public String getEnctype() {
if (this.enctype != null) {
return (this.enctype);
}
ValueExpression vb = getValueExpression("enctype");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the encoding type for this form submit.
*
* @param enctype The new enctype path
*/
public void setEnctype(String enctype) {
this.enctype = enctype;
}
/**
* Return the component family to which this component belongs.
*/
public String getFamily() {
return "org.apache.struts.faces.Form";
}
/**
* Return the focus element name.
*/
public String getFocus() {
if (this.focus != null) {
return (this.focus);
}
ValueExpression vb = getValueExpression("focus");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the focus element name.
*
* @param focus The new focus path
*/
public void setFocus(String focus) {
this.focus = focus;
}
/**
* Return the focus element index.
*/
public String getFocusIndex() {
if (this.focusIndex != null) {
return (this.focusIndex);
}
ValueExpression vb = getValueExpression("focusIndex");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the focus element index.
*
* @param focusIndex The new focusIndex path
*/
public void setFocusIndex(String focusIndex) {
this.focusIndex = focusIndex;
}
/**
* Return the JavaScript to execute on form reset.
*/
public String getOnreset() {
if (this.onreset != null) {
return (this.onreset);
}
ValueExpression vb = getValueExpression("onreset");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the JavaScript to execute on form reset.
*
* @param onreset The new onreset path
*/
public void setOnreset(String onreset) {
this.onreset = onreset;
}
/**
* Return the JavaScript to execute on form submit.
*/
public String getOnsubmit() {
if (this.onsubmit != null) {
return (this.onsubmit);
}
ValueExpression vb = getValueExpression("onsubmit");
if (vb != null) {
return ((String) vb.getValue(getFacesContext().getELContext()));
} else {
return (null);
}
}
/**
* Set the JavaScript to execute on form submit.
*
* @param onsubmit The new onsubmit path
*/
public void setOnsubmit(String onsubmit) {
this.onsubmit = onsubmit;
}
/**
* Return the CSS style(s) to be rendered for this component.
*/
public String getStyle() {
ValueExpression vb = getValueExpression("style");
if (vb != null) {
return (String) vb.getValue(getFacesContext().getELContext());
} else {
return style;
}
}
/**
* Set the CSS style(s) to be rendered for this component.
*
* @param style The new CSS style(s)
*/
public void setStyle(String style) {
this.style = style;
}
/**
* Return the CSS style class(es) to be rendered for this component.
*/
public String getStyleClass() {
ValueExpression vb = getValueExpression("styleClass");
if (vb != null) {
return (String) vb.getValue(getFacesContext().getELContext());
} else {
return styleClass;
}
}
/**
* Set the CSS style class(es) to be rendered for this component.
*
* @param styleClass The new CSS style class(es)
*/
public void setStyleClass(String styleClass) {
this.styleClass = styleClass;
}
/**
* Return the target frame for the response to this form submit.
*/
public String getTarget() {
ValueExpression vb = getValueExpression("target");
if (vb != null) {
return (String) vb.getValue(getFacesContext().getELContext());
} else {
return target;
}
}
/**
* Set the target frame for the response to this form submit.
*
* @param target The new CSS target(s)
*/
public void setTarget(String target) {
this.target = target;
}
// ---------------------------------------------------------- UIForm Methods
/**
* Create an instance of the form bean (if necessary) before
* delegating to the standard decoding process.
*
* @param context FacesContext for the request we are processing
*/
public void processDecodes(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (log.isDebugEnabled()) {
log.debug("processDecodes(" + getClientId(context) + ")");
}
// Create the form bean (if necessary)
Map params = context.getExternalContext().getRequestParameterMap();
if (params.containsKey(getClientId(context))) {
createActionForm(context);
}
// Perform the standard decode processing
super.processDecodes(context);
}
/**
* Restore our state from the specified object.
*
* @param context FacesContext for the current request
* @param state Object containing our saved state
*/
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[]) state;
super.restoreState(context, values[0]);
action = (String) values[1];
enctype = (String) values[2];
focus = (String) values[3];
focusIndex = (String) values[4];
onreset = (String) values[5];
onsubmit = (String) values[6];
style = (String) values[7];
styleClass = (String) values[8];
target = (String) values[9];
}
/**
* Create and return an object representing our state to be saved.
*
* @param context FacesContext for the current request
*/
public Object saveState(FacesContext context) {
Object values[] = new Object[10];
values[0] = super.saveState(context);
values[1] = action;
values[2] = enctype;
values[3] = focus;
values[4] = focusIndex;
values[5] = onreset;
values[6] = onsubmit;
values[7] = style;
values[8] = styleClass;
values[9] = target;
return (values);
}
// ---------------------------------------------------------- Public Methods
/**
* Create an appropriate form bean in the appropriate scope, if one
* does not already exist.
*
* @param context FacesContext for the current request
*
* @exception IllegalArgumentException if no ActionConfig for the
* specified action attribute can be located
* @exception IllegalArgumentException if no FormBeanConfig for the
* specified form bean can be located
* @exception IllegalArgumentException if no ModuleConfig can be
* located for this application module
*/
public void createActionForm(FacesContext context) {
final StrutsContext strutsContext = new StrutsContext(context);
// Look up the application module configuration information we need
ModuleConfig moduleConfig = strutsContext.getModuleConfig();
// Look up the ActionConfig we are processing
String action = getAction();
ActionConfig actionConfig = moduleConfig.findActionConfig(action);
if (actionConfig == null) {
throw new IllegalArgumentException("Cannot find action '" +
action + "' configuration");
}
// Does this ActionConfig specify a form bean?
String name = actionConfig.getName();
if (name == null) {
return;
}
// Look up the FormBeanConfig we are processing
FormBeanConfig fbConfig = moduleConfig.findFormBeanConfig(name);
if (fbConfig == null) {
throw new IllegalArgumentException("Cannot find form bean '" +
name + "' configuration");
}
// Does a usable form bean attribute already exist?
String attribute = actionConfig.getAttribute();
String scope = actionConfig.getScope();
ActionForm instance = null;
if ("request".equals(scope)) {
instance = Utils.getMapValue(ActionForm.class,
context.getExternalContext().getRequestMap(), attribute);
} else if ("session".equals(scope)) {
context.getExternalContext().getSession(true);
instance = Utils.getMapValue(ActionForm.class,
context.getExternalContext().getSessionMap(), attribute);
}
if (instance != null) {
if (fbConfig.getDynamic()) {
String className =
((DynaBean) instance).getDynaClass().getName();
if (className.equals(fbConfig.getName())) {
if (log.isDebugEnabled()) {
log.debug
(" Recycling existing DynaActionForm instance " +
"of type '" + className + "'");
}
return;
}
} else {
try {
Class configClass =
RequestUtils.applicationClass(fbConfig.getType());
if (configClass.isAssignableFrom(instance.getClass())) {
if (log.isDebugEnabled()) {
log.debug
(" Recycling existing ActionForm instance " +
"of class '" + instance.getClass().getName()
+ "'");
}
return;
}
} catch (Throwable t) {
IllegalArgumentException t2 = new IllegalArgumentException
("Cannot load form bean class '" +
fbConfig.getType() + "'");
t2.initCause(t);
throw t2;
}
}
}
// Create a new form bean instance
if (fbConfig.getDynamic()) {
try {
DynaActionFormClass dynaClass =
DynaActionFormClass.createDynaActionFormClass(fbConfig);
instance = (ActionForm) dynaClass.newInstance();
if (log.isDebugEnabled()) {
log.debug
(" Creating new DynaActionForm instance " +
"of type '" + fbConfig.getType() + "'");
log.trace(" --> " + instance);
}
} catch (Throwable t) {
IllegalArgumentException t2 = new IllegalArgumentException
("Cannot create form bean of type '" +
fbConfig.getType() + "'");
t2.initCause(t);
throw t2;
}
} else {
try {
instance = (ActionForm)
RequestUtils.applicationInstance(fbConfig.getType());
if (log.isDebugEnabled()) {
log.debug
(" Creating new ActionForm instance " +
"of type '" + fbConfig.getType() + "'");
log.trace(" --> " + instance);
}
} catch (Throwable t) {
IllegalArgumentException t2 = new IllegalArgumentException
("Cannot create form bean of class '" +
fbConfig.getType() + "'");
t2.initCause(t);
throw t2;
}
}
// Configure and cache the form bean instance in the correct scope
ActionServlet servlet = Utils.getMapValue(ActionServlet.class,
context.getExternalContext().getApplicationMap(),
Globals.ACTION_SERVLET_KEY);
instance.setServlet(servlet);
if ("request".equals(scope)) {
context.getExternalContext().getRequestMap().put
(attribute, instance);
} else if ("session".equals(scope)) {
context.getExternalContext().getSessionMap().put
(attribute, instance);
}
}
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