/**
* 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.richfaces.component.util;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import org.richfaces.renderkit.util.RendererUtils;
import com.google.common.base.Strings;
/**
* @author Maksim Kaszynski
* @author Manfred Geiler
*/
public final class InputUtils {
private static final ConverterLookupStrategy DEFAULT_CONVERTER_LOOKUP_STRATEGY = new ConverterLookupStrategy() {
public Converter getConverterByValue(FacesContext context, UIComponent component, Object value) {
Converter result = null;
if (component instanceof ValueHolder) {
result = ((ValueHolder) component).getConverter();
}
if (result == null && value != null) {
result = getConverterForType(context, value.getClass());
}
return result;
}
public Converter getConverterByProperty(FacesContext context, UIComponent component) {
return findConverter(context, component, "value");
}
};
private InputUtils() {
}
public interface ConverterLookupStrategy {
Converter getConverterByProperty(FacesContext context, UIComponent component);
Converter getConverterByValue(FacesContext context, UIComponent component, Object value);
}
public static boolean isDisabled(UIComponent component) {
return RendererUtils.getInstance().isBooleanAttribute(component, "disabled");
}
public static boolean isReadOnly(UIComponent component) {
return RendererUtils.getInstance().isBooleanAttribute(component, "readonly");
}
/**
* Returns converter for given Java type
*/
public static Converter getConverterForType(FacesContext context, Class<?> type) {
// see getConvertedValue
if (type == null || Object.class.equals(type)) {
return null;
}
return context.getApplication().createConverter(type);
}
public static String getConvertedStringValue(FacesContext context, UIComponent component, Object value)
throws ConverterException {
return getConvertedStringValue(context, component, DEFAULT_CONVERTER_LOOKUP_STRATEGY, value);
}
public static String getConvertedStringValue(FacesContext context, UIComponent component,
ConverterLookupStrategy converterLookupStrategy, Object value) throws ConverterException {
Converter converter = converterLookupStrategy.getConverterByValue(context, component, value);
if (converter != null) {
return converter.getAsString(context, component, value);
}
if (value == null) {
return "";
}
if (value instanceof String) {
return (String) value;
}
return value.toString();
}
/**
* <p>Returns {@link Converter} based on a converter configured for provided {@link UIComponent} or returns converter for type referenced by given property's {@link ValueExpression}.</p>
*
* <p>If no converter applied for conditions above, null is returned instead.</p>
*/
public static Converter findConverter(FacesContext facesContext, UIComponent component, String property) {
Converter converter = null;
if (component instanceof ValueHolder) {
converter = ((ValueHolder) component).getConverter();
}
if (converter == null) {
ValueExpression ve = component.getValueExpression(property);
if (ve != null) {
Class<?> valueType = ve.getType(facesContext.getELContext());
if (valueType == null || Object.class.equals(valueType)) {
// No converter needed
} else {
converter = facesContext.getApplication().createConverter(valueType);
}
}
}
return converter;
}
public static Object getConvertedValue(FacesContext context, UIComponent component, Object val) throws ConverterException {
return getConvertedValue(context, component, DEFAULT_CONVERTER_LOOKUP_STRATEGY, val);
}
public static Object getConvertedValue(FacesContext context, UIComponent component,
ConverterLookupStrategy converterLookupStrategy, Object val) throws ConverterException {
String submittedString = (String) val;
if (Strings.isNullOrEmpty(submittedString)) {
return null;
}
Converter converter = converterLookupStrategy.getConverterByProperty(context, (UIInput) component);
if (converter != null) {
return converter.getAsObject(context, component, submittedString);
}
return submittedString;
}
public static String getInputValue(FacesContext context, UIComponent component) throws ConverterException {
return getInputValue(context, component, DEFAULT_CONVERTER_LOOKUP_STRATEGY);
}
public static String getInputValue(FacesContext context, UIComponent component,
ConverterLookupStrategy converterLookupStrategy) throws ConverterException {
UIInput input = (UIInput) component;
String submittedValue = (String) input.getSubmittedValue();
if (submittedValue != null) {
return submittedValue;
}
Object value = input.getValue();
Converter converter = converterLookupStrategy.getConverterByValue(context, input, value);
if (converter != null) {
return converter.getAsString(context, input, value);
} else {
return value != null ? value.toString() : "";
}
}
}