/**
* License Agreement.
*
* JBoss RichFaces 3.0 - Ajax4jsf Component Library
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.richfaces.model.impl.expressive;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.application.Application;
import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import org.ajax4jsf.util.ELUtils;
import org.richfaces.model.Field;
import org.richfaces.model.SortField;
import org.richfaces.model.SortOrder;
/**
*
* class responsible for packaging objects with their properties evaluated using EL.
*
* @author Maksim Kaszynski
*
*/
public class ObjectWrapperFactory {
interface ObjectConvertor{
public Object convert(Object o);
}
private Expression [] expressions;
private FacesContext context;
private String var;
private Object varValue;
public ObjectWrapperFactory(FacesContext context, final String var, SortOrder sortOrder) {
this.context = context;
Application application = context.getApplication();
ELResolver resolver = application.getELResolver();
ELContext elContext = context.getELContext();
this.var = var;
SortField[] sortFields = sortOrder.getFields();
expressions = new Expression[sortFields.length];
for (int i = 0; i < sortFields.length; i++) {
final SortField field = sortFields[i];
final String name = field.getName();
if (ELUtils.isValueReference(name)) {
expressions[i] = new ValueBindingExpression(context, name, var);
} else if (name.startsWith(UIViewRoot.UNIQUE_ID_PREFIX)) {
expressions[i] = new NullExpression(name);
} else {
expressions[i] = new SimplePropertyExpression(name, elContext, resolver);
}
}
}
public ObjectWrapperFactory(FacesContext context, final String var, List<? extends Field> sortOrder) {
this.context = context;
Application application = context.getApplication();
ELResolver resolver = application.getELResolver();
ELContext elContext = context.getELContext();
this.var = var;
expressions = new Expression[sortOrder.size()];
int i = 0;
for (Field field : sortOrder) {
javax.el.Expression elExpression = field.getExpression();
Expression expression;
if (elExpression instanceof ValueExpression) {
ValueExpression valueExpression = (ValueExpression) elExpression;
if (valueExpression.isLiteralText()) {
String expressionString = valueExpression.getExpressionString();
if (expressionString.startsWith(UIViewRoot.UNIQUE_ID_PREFIX)) {
expression = new NullExpression(expressionString);
} else {
expression = new SimplePropertyExpression(expressionString, elContext, resolver);
}
} else {
expression = new ValueBindingExpression(context, valueExpression, var);
}
} else if(elExpression instanceof MethodExpression){
expression = new MethodBindingExpression(context, (MethodExpression)elExpression);
} else {
throw new IllegalArgumentException();
}
expressions[i++] = expression;
}
}
void convertList (List<? super Object> list, ObjectConvertor c) {
int l = list.size();
for (int i = 0; i < l; i++) {
Object o = list.get(i);
list.set(i, c.convert(o));
}
}
public List<? super Object> unwrapList(List<Object> list) {
convertList(list, new ObjectConvertor() {
public Object convert(Object o) {
return unwrapObject(o);
}
});
Map<String, Object> requestMap = getRequestMap();
if (varValue == null) {
requestMap.remove(var);
} else {
requestMap.put(var, varValue);
}
return list;
}
/**
*
*/
private Map<String, Object> getRequestMap() {
ExternalContext externalContext = context.getExternalContext();
Map<String, Object> requestMap = externalContext.getRequestMap();
return requestMap;
}
public Object unwrapObject(Object wrapper) {
return ((JavaBeanWrapper) wrapper).getWrappedObject();
}
public List<Object> wrapList(List<Object> list) {
varValue = getRequestMap().get(var);
convertList(list, new ObjectConvertor() {
public Object convert(Object o) {
return wrapObject(o);
}
});
return list;
}
public JavaBeanWrapper wrapObject(Object o) {
Map<String, Object> props = new HashMap<String, Object>();
for (int i = 0; i < expressions.length; i++) {
Expression expression = expressions[i];
props.put(expression.getExpressionString(), expression.evaluate(o));
}
return new JavaBeanWrapper(o, props);
}
}