package org.apache.myfaces.tobago.taglib.component;
/*
* 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.
*/
import org.apache.myfaces.tobago.apt.annotation.Tag;
import org.apache.myfaces.tobago.apt.annotation.BodyContent;
import org.apache.myfaces.tobago.apt.annotation.TagAttribute;
import org.apache.myfaces.tobago.component.ComponentUtil;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_CONVERTER;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspException;
import javax.faces.webapp.UIComponentTag;
import javax.faces.component.UIComponent;
import javax.faces.component.ValueHolder;
import javax.faces.el.ValueBinding;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
/*
* Date: Oct 13, 2006
* Time: 6:01:59 PM
*/
/**
* Register an Converter instance on the UIComponent
* associated with the closest parent UIComponent.
*/
@Tag(name = "converter", bodyContent = BodyContent.EMPTY)
public class ConverterTag extends TagSupport {
private static final long serialVersionUID = 8565994799165107984L;
/**
* The converterId of the {@link javax.faces.convert.Converter}
*/
private String converterId;
private String binding;
/**
* The converterId of a registered converter.
*
* @param converterId A valid converterId
*/
@TagAttribute()
public void setConverterId(String converterId) {
this.converterId = converterId;
}
/**
* The value binding expression to a converter.
*
* @param binding A valid binding
*/
@TagAttribute
public void setBinding(String binding) {
this.binding = binding;
}
/**
* Create a new instance of the specified {@link javax.faces.convert.Converter}
* class, and register it with the {@link javax.faces.component.UIComponent} instance associated
* with our most immediately surrounding {@link javax.faces.webapp.UIComponentTag} instance, if
* the {@link javax.faces.component.UIComponent} instance was created by this execution of the
* containing JSP page.
*
* @throws javax.servlet.jsp.JspException if a JSP error occurs
*/
public int doStartTag() throws JspException {
// Locate our parent UIComponentTag
UIComponentTag tag =
UIComponentTag.getParentUIComponentTag(pageContext);
if (tag == null) {
// TODO Message resource i18n
throw new JspException("Not nested in faces tag");
}
if (!tag.getCreated()) {
return (SKIP_BODY);
}
UIComponent component = tag.getComponentInstance();
if (component == null) {
// TODO Message resource i18n
throw new JspException("Component Instance is null");
}
if (!(component instanceof ValueHolder)) {
// TODO Message resource i18n
throw new JspException("Component " + component.getClass().getName() + " is not instanceof ValueHolder");
}
ValueHolder valueHolder = (ValueHolder) component;
Converter converter = null;
if (binding != null && UIComponentTag.isValueReference(binding)) {
ValueBinding valueBinding = ComponentUtil.createValueBinding(binding);
if (valueBinding != null) {
Object obj = valueBinding.getValue(FacesContext.getCurrentInstance());
if (obj != null && obj instanceof Converter) {
converter = (Converter) obj;
}
}
}
if (converter == null && converterId != null) {
String localConverterId;
// evaluate any VB expression that we were passed
if (UIComponentTag.isValueReference(converterId)) {
ValueBinding typeValueBinding = ComponentUtil.createValueBinding(converterId);
localConverterId = (String) typeValueBinding.getValue(FacesContext.getCurrentInstance());
} else {
localConverterId = converterId;
}
converter = FacesContext.getCurrentInstance().getApplication().createConverter(localConverterId);
if (converter != null && binding != null) {
ComponentUtil.setValueForValueBinding(binding, converter);
}
}
if (converter != null) {
if (UIComponentTag.isValueReference(binding)) {
component.setValueBinding(ATTR_CONVERTER, ComponentUtil.createValueBinding(binding));
} else {
valueHolder.setConverter(converter);
}
}
// TODO else LOG.warn?
return (SKIP_BODY);
}
/**
* <p>Release references to any acquired resources.
*/
public void release() {
this.converterId = null;
this.binding = null;
}
}