/*
* Copyright 2010 Lincoln Baxter, III
*
* 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 com.ocpsoft.pretty.faces.beans;
import java.util.List;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.ocpsoft.pretty.PrettyContext;
import com.ocpsoft.pretty.PrettyException;
import com.ocpsoft.pretty.faces.config.mapping.PathParameter;
import com.ocpsoft.pretty.faces.config.mapping.QueryParameter;
import com.ocpsoft.pretty.faces.config.mapping.UrlMapping;
import com.ocpsoft.pretty.faces.url.QueryString;
import com.ocpsoft.pretty.faces.url.URL;
import com.ocpsoft.pretty.faces.util.FacesElUtils;
import com.ocpsoft.pretty.faces.util.FacesStateUtils;
import com.ocpsoft.pretty.faces.util.NullComponent;
/**
* @author Lincoln Baxter, III <lincoln@ocpsoft.com>
*/
public class ParameterInjector
{
private static final Log log = LogFactory.getLog(ParameterInjector.class);
private static final FacesElUtils elUtils = new FacesElUtils();
public void injectParameters(final FacesContext context)
{
log.trace("Injecting parameters");
PrettyContext prettyContext = PrettyContext.getCurrentInstance(context);
URL url = prettyContext.getRequestURL();
UrlMapping mapping = prettyContext.getCurrentMapping();
if (mapping != null)
{
injectPathParams(context, url, mapping);
injectQueryParams(context, mapping, prettyContext);
}
}
private void injectPathParams(final FacesContext context, final URL url, final UrlMapping mapping)
{
// skip path parameter injection due to onPostback attribute?
if (!mapping.isOnPostback() && FacesStateUtils.isPostback(context))
{
return;
}
List<PathParameter> params = mapping.getPatternParser().parse(url);
for (PathParameter param : params)
{
String el = param.getExpression().getELExpression();
if ((el != null) && !"".equals(el.trim()))
{
String valueAsString = param.getValue();
try
{
// get the type of the referenced property and try to obtain a converter for it
Class<?> expectedType = elUtils.getExpectedType(context, el);
Converter converter = context.getApplication().createConverter(expectedType);
// Use the convert to create the correct type
if (converter != null)
{
Object convertedValue = converter.getAsObject(context, new NullComponent(), valueAsString);
elUtils.setValue(context, el, convertedValue);
}
else
{
elUtils.setValue(context, el, valueAsString);
}
}
catch (Exception e)
{
throw new PrettyException("PrettyFaces: Exception occurred while processing <" + mapping.getId() + ":"
+ el + "> for URL <" + url + ">", e);
}
}
}
}
private void injectQueryParams(final FacesContext context, final UrlMapping mapping,
final PrettyContext prettyContext)
{
boolean isPostback = FacesStateUtils.isPostback(context);
List<QueryParameter> params = mapping.getQueryParams();
QueryString queryString = prettyContext.getRequestQueryString();
for (QueryParameter param : params)
{
// check if to skip this QueryParameter due to onPostback attribute
if (!param.isOnPostback() && isPostback)
{
continue;
}
String el = param.getExpression().getELExpression();
if ((el != null) && !"".equals(el.trim()))
{
String name = param.getName();
if (queryString.getParameterMap().containsKey(name))
{
try
{
if (elUtils.getExpectedType(context, el).isArray())
{
String[] values = queryString.getParameterValues(name);
elUtils.setValue(context, el, values);
}
else
{
String valueAsString = queryString.getParameter(name);
// get the type of the referenced property and try to obtain a converter for it
Class<?> expectedType = elUtils.getExpectedType(context, el);
Converter converter = context.getApplication().createConverter(expectedType);
// Use the convert to create the correct type
if (converter != null)
{
Object convertedValue = converter.getAsObject(context, new NullComponent(), valueAsString);
elUtils.setValue(context, el, convertedValue);
}
else
{
elUtils.setValue(context, el, valueAsString);
}
}
}
catch (Exception e)
{
throw new PrettyException(
"PrettyFaces: Exception occurred while processing mapping<" + mapping.getId() + ":" + el
+ "> for query parameter named<" + name + "> " + e.getMessage(), e);
}
}
}
}
}
}