ResolvingMit Hilfe des VariableResolvers und des PropertyResolvers löst JSF die EL-Expressions auf. Der VariableResolver ist zuständig für den linken Teil der Expression. Für den restlichen rechten Teil ist der PropertyResolver zuständig.Beispiel:Bean Person:
public class PersonBean implements java.io.Serializable {
private Address address;
...
}
public class Address implements java.io.Serializable {
private City city;
private String street;
private String zipCode;
...
}
public class City implements java.io.Serializable {
private String name;
...
}
<inputField value="#{personBean.address.city.name}" />
package org.j4fry.jsf;
public class CustomVariableResolver extends VariableResolver {
private Logger log = Logger.getLogger(CustomVariableResolver.class);
// Ursprünglicher VariableResolver
private VariableResolver variableResolver;
public CustomVariableResolver(VariableResolver variableResolver) {
this.variableResolver = variableResolver;
}
@Override
public Object resolveVariable(FacesContext arg0, String arg1)
throws EvaluationException {
log.info("resolve: " + arg1);
// Delegation an ursprünglichen VariableResolver
return variableResolver.resolveVariable(arg0, arg1);
}
}
package org.j4fry.jsf;
public class CustomPropertyResolver extends PropertyResolver {
private Logger log = Logger.getLogger(CustomPropertyResolver.class);
// Ursprünglicher PropertyResolver
private PropertyResolver propertyResolver;
public CustomPropertyResolver(PropertyResolver propertyResolver) {
this.propertyResolver = propertyResolver;
}
@Override
public Object getValue(Object fromObject, Object property)
throws EvaluationException, PropertyNotFoundException {
log.debug("getValue: fromObject[" + fromObject + "] property[" + property + "]");
// Delegation an ursprünglichen PropertyResolver
return propertyResolver.getValue(fromObject, property);
}
@Override
public void setValue(Object toObject, Object property, Object value)
throws EvaluationException, PropertyNotFoundException {
log.debug("setValue: toObject[" + toObject + "] property[" + property + "] value[" + value + "]");
// Delegation an ursprünglichen PropertyResolver
propertyResolver.setValue(toObject, property, value);
}
// Bei den restlichen Methoden wird einfach an den PropertyResolver delegiert
@Override
public void setValue(Object arg0, int arg1, Object arg2)
throws EvaluationException, PropertyNotFoundException {
propertyResolver.setValue(arg0, arg1, arg2);
}
@Override
public Class getType(Object arg0, int arg1) throws EvaluationException,
PropertyNotFoundException {
return propertyResolver.getType(arg0, arg1);
}
@Override
public Class getType(Object arg0, Object arg1) throws EvaluationException,
PropertyNotFoundException {
return propertyResolver.getType(arg0, arg1);
}
@Override
public Object getValue(Object arg0, int arg1) throws EvaluationException,
PropertyNotFoundException {
return propertyResolver.getValue(arg0, arg1);
}
@Override
public boolean isReadOnly(Object arg0, int arg1)
throws EvaluationException, PropertyNotFoundException {
return propertyResolver.isReadOnly(arg0, arg1);
}
@Override
public boolean isReadOnly(Object arg0, Object arg1)
throws EvaluationException, PropertyNotFoundException {
return propertyResolver.isReadOnly(arg0, arg1);
}
}
<application>
<variable-resolver>
org.j4fry.jsf.CustomVariableResolver
</variable-resolver>
<property-resolver>
org.j4fry.jsf.CustomPropertyResolver
</property-resolver>
</application>
