/*
* 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.ArrayList;
import java.util.List;
import javax.el.ELException;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
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.url.URLPatternParser;
import com.ocpsoft.pretty.faces.util.FacesElUtils;
import com.ocpsoft.pretty.faces.util.NullComponent;
/**
* @author Lincoln Baxter, III <lincoln@ocpsoft.com>
*/
public class ExtractedValuesURLBuilder
{
private static final FacesElUtils elUtils = new FacesElUtils();
/**
* For all required values of the given PrettyUrlMapping, extract values from their mapped backing beans and create a
* URL based on the url-pattern.
*
* @param mapping Mapping for which to extract values and generate URL
* @return The fully constructed URL
*/
public URL buildURL(final UrlMapping mapping)
{
URL result = null;
String expression = "";
Object value = null;
try
{
FacesContext context = FacesContext.getCurrentInstance();
URLPatternParser parser = mapping.getPatternParser();
List<PathParameter> parameters = parser.getPathParameters();
List<String> parameterValues = new ArrayList<String>();
for (PathParameter injection : parameters)
{
// read value of the path parameter
expression = injection.getExpression().getELExpression();
value = elUtils.getValue(context, expression);
if (value == null)
{
throw new PrettyException("PrettyFaces: Exception occurred while building URL for MappingId < "
+ mapping.getId() + " >, Required value " + " < " + expression + " > was null");
}
// convert the value to a string using the correct converter
Converter converter = context.getApplication().createConverter(value.getClass());
if (converter != null)
{
String convertedValue = converter.getAsString(context, new NullComponent(), value);
if (convertedValue == null)
{
throw new PrettyException("PrettyFaces: The converter <" + converter.getClass().getName()
+ "> returned null while converting the object <" + value.toString() + ">!");
}
value = convertedValue;
}
parameterValues.add(value.toString());
}
result = parser.getMappedURL(parameterValues).encode();
}
catch (ELException e)
{
throw new PrettyException("PrettyFaces: Exception occurred while building URL for MappingId < "
+ mapping.getId() + " >, Error occurred while extracting values from backing bean" + " < "
+ expression + ":" + value + " >", e);
}
return result;
}
public QueryString buildQueryString(final UrlMapping mapping)
{
QueryString result = new QueryString();
String expression = "";
Object value = null;
try
{
FacesContext context = FacesContext.getCurrentInstance();
List<QueryParameter> queryParams = mapping.getQueryParams();
List<QueryParameter> queryParameterValues = new ArrayList<QueryParameter>();
for (QueryParameter injection : queryParams)
{
String name = injection.getName();
expression = injection.getExpression().getELExpression();
value = elUtils.getValue(context, expression);
if ((name != null) && (value != null))
{
if (value.getClass().isArray())
{
Object[] values = (Object[]) value;
for (Object temp : values)
{
queryParameterValues.add(new QueryParameter(name, temp.toString()));
}
}
else
{
queryParameterValues.add(new QueryParameter(name, value.toString()));
}
}
}
result = QueryString.build(queryParameterValues);
}
catch (ELException e)
{
throw new PrettyException("PrettyFaces: Exception occurred while building QueryString for MappingId < "
+ mapping.getId() + " >, Error occurred while extracting values from backing bean" + " < "
+ expression + ":" + value + " >", e);
}
return result;
}
}