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/*
* 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.util;
import java.util.regex.Pattern;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
/**
* @author Lincoln Baxter, III
*/
public class FacesElUtils
{
private static final String EL_REGEX = "\\#\\{\\s*[^}]+\\s*\\}";
/**
* The pattern to match any EL expression in a String. Regex Group 0 contains
* the entire expression, no more.
*/
public static final Pattern elPattern = Pattern.compile(EL_REGEX);
public Object coerceToType(final FacesContext context, final String expression, final Object value) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
return ef.coerceToType(value, ve.getType(context.getELContext()));
}
public Class getExpectedType(final FacesContext context, final String expression) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
return ve.getType(context.getELContext());
}
public Object getValue(final FacesContext context, final String expression) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
return ve.getValue(context.getELContext());
}
public Object invokeMethod(final FacesContext context, final String expression) throws ELException
{
return invokeMethod(context, expression, new Class[] {}, null);
}
public Object invokeMethod(final FacesContext context, final String expression, Class[] argumentTypes,
Object[] argumentValues) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
MethodExpression me = ef.createMethodExpression(context.getELContext(), expression, Object.class, argumentTypes);
return me.invoke(context.getELContext(), argumentValues);
}
public boolean isEl(final String viewId)
{
if (viewId == null)
{
return false;
}
return elPattern.matcher(viewId).matches();
}
public void setValue(final FacesContext context, final String expression, final Object value) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
ve.setValue(context.getELContext(), ef.coerceToType(value, ve.getType(context.getELContext())));
}
public ValueExpression createValueExpression(final FacesContext context, final String expression) throws ELException
{
ExpressionFactory ef = context.getApplication().getExpressionFactory();
ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
return ve;
}
}
