/*
* 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.myfaces.tobago.internal.taglib.component;
import org.apache.myfaces.tobago.apt.annotation.BodyContent;
import org.apache.myfaces.tobago.apt.annotation.Tag;
import org.apache.myfaces.tobago.apt.annotation.TagAttribute;
import org.apache.myfaces.tobago.apt.annotation.SimpleTag;
import org.apache.myfaces.tobago.component.Attributes;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.webapp.UIComponentClassicTagBase;
import javax.faces.webapp.UIComponentELTag;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* Register an Converter instance on the UIComponent
* associated with the closest parent UIComponent.
*/
@Tag(name = "converter", bodyContent = BodyContent.EMPTY)
@SimpleTag(
faceletHandler = "org.apache.myfaces.tobago.facelets.ConverterHandler")
public abstract class ConverterTag extends TagSupport {
private static final long serialVersionUID = 2L;
private ValueExpression binding;
private ValueExpression converterId;
/**
* 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.UIComponentELTag} 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
UIComponentClassicTagBase tag =
UIComponentELTag.getParentUIComponentClassicTagBase(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;
final FacesContext facesContext = FacesContext.getCurrentInstance();
final ELContext elContext = facesContext.getELContext();
if (binding != null && !binding.isLiteralText()) {
converter = (Converter) binding.getValue(elContext);
}
if (converter == null && converterId != null) {
String localConverterId = (String) converterId.getValue(elContext);
// evaluate any VB expression that we were passed
converter = facesContext.getApplication().createConverter(localConverterId);
}
if (converter != null) {
if (!binding.isLiteralText()) {
ValueExpression ve = component.getValueExpression(Attributes.CONVERTER);
if (ve != null) {
ve.setValue(elContext, converter);
}
} else {
valueHolder.setConverter(converter);
}
}
return (SKIP_BODY);
}
@Override
public void release() {
super.release();
binding = null;
converterId = null;
}
/**
* The converterId of a registered converter.
*/
@TagAttribute(name = "converterId", type = "java.lang.String")
public void setConverterId(ValueExpression converterId) {
this.converterId = converterId;
}
/**
* The value binding expression to a converter.
*/
@TagAttribute(name = "binding", type = "javax.faces.convert.Converter")
public void setBinding(ValueExpression binding) {
this.binding = binding;
}
}