/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* 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.ajax4jsf.renderkit;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.el.MethodNotFoundException;
import org.ajax4jsf.Messages;
import org.apache.commons.beanutils.MethodUtils;
/**
* Utils for working with tempates
* @author ayukhovich@exadel.com (latest modification by $Author: alexsmirnov $)
* @version $Revision: 1.1.2.1 $ $Date: 2007/01/09 18:58:52 $
*/
public class ComponentUtils {
private final static String UTILS_PREFIX = "util.";
/**
*
* @param className
* @param functionName
* @param parameters
* @return
*/
public static Object callFunction( FacesContext context, UIComponent component, RendererBase renderer, String functionName, Object[] parameters ) {
Object returnObject = null;
int sizeParameters = 0;
int sizeArrayParameters = 2;
if ( parameters != null ) {
sizeParameters = parameters.length;
sizeArrayParameters = 3;
}
Object[][] arrayParameters = new Object[sizeArrayParameters][];
arrayParameters[0] = new Object[sizeParameters+2];
arrayParameters[1] = new Object[sizeParameters+1];
if ( sizeParameters != 0 ) {
arrayParameters[2] = new Object[sizeParameters];
}
arrayParameters[0][0] = context;
arrayParameters[0][1] = component;
arrayParameters[1][0] = component;
if ( parameters != null ) {
for (int iParameter=0;iParameter<parameters.length;iParameter++) {
arrayParameters[0][iParameter+2] = parameters;
arrayParameters[1][iParameter+1] = parameters;
arrayParameters[2][iParameter] = parameters;
}
}
String methodName;
Object object;
if(functionName.startsWith(UTILS_PREFIX)){
methodName = functionName.substring(UTILS_PREFIX.length());
object = renderer.getUtils();
} else {
object = renderer;
methodName = functionName;
}
returnObject = invokeMethod(object, methodName, arrayParameters );
return returnObject;
}
/**
* Invoke a named method whose parameter type matches the object type.
* @param objects - invoke method on this object
* @param methodName - get method with this name
* @param arrayParameters - use these arguments - treat null as empty array
* @return
*/
private static Object invokeMethod(Object object, String methodName, Object[][] arrayParameters) {
try {
for (int iParameter = 0; iParameter < arrayParameters.length; iParameter++) {
try {
return MethodUtils.invokeMethod(object, methodName, arrayParameters[iParameter]);
} catch (NoSuchMethodException e) {
continue;
}
}
} catch (InvocationTargetException e) {
throw new FacesException(Messages.getMessage(Messages.METHOD_CALL_ERROR_2b, methodName, e.getCause().getMessage()), e);
} catch (IllegalAccessException e) {
throw new FacesException(Messages.getMessage(Messages.METHOD_CALL_ERROR_4b, methodName, e.getMessage()), e);
}
throw new MethodNotFoundException(Messages.getMessage(Messages.METHOD_CALL_ERROR_6b, methodName, object));
}
/**
* Write html-attribute
* @param writer
* @param attribute
* @param value
* @throws IOException
*/
public static void writeAttribute(ResponseWriter writer, String attribute, Object value ) throws IOException {
if ( (value != null) && (value.toString().length()!=0) ) {
writer.writeAttribute(attribute, value.toString(), attribute );
}
}
}