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package com.sun.faces.taglib.jsf_core;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.FacesLogger;
import javax.faces.webapp.ValidatorELTag;
import javax.faces.validator.Validator;
import javax.faces.context.FacesContext;
import javax.faces.FacesException;
import javax.servlet.jsp.JspException;
import javax.el.ELContext;
import javax.el.ValueExpression;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Base class for all ValidatorTags.
*/
public class AbstractValidatorTag extends ValidatorELTag {
private static final Logger LOGGER = FacesLogger.TAGLIB.getLogger();
/**
* The {@link javax.el.ValueExpression} that evaluates to an object that
* implements {@link javax.faces.convert.Converter}.
*/
protected ValueExpression binding = null;
/**
* The identifier of the {@link javax.faces.validator.Validator}
* instance to be created.
*/
protected ValueExpression validatorId = null;
// ---------------------------------------------------------- Public Methods
/**
* Set the expression that will be used to create a
* {@link javax.el.ValueExpression} that references a backing bean property
* of the {@link javax.faces.validator.Validator} instance to be created.
*
* @param binding The new expression
*/
public void setBinding(ValueExpression binding) {
this.binding = binding;
} // END setBinding
/**
* Set the identifer of the {@link javax.faces.validator.Validator}
* instance to be created.
*
* @param validatorId The identifier of the converter instance to be
* created.
*/
public void setValidatorId(ValueExpression validatorId) {
this.validatorId = validatorId;
} // END setValidatorId
// --------------------------------------------- Methods from ValdiatorELTag
protected Validator createValidator() throws JspException {
try {
return createValidator(validatorId,
binding,
FacesContext.getCurrentInstance());
} catch (FacesException fe) {
throw new JspException(fe.getCause());
}
}
protected static Validator createValidator(ValueExpression validatorId,
ValueExpression binding,
FacesContext facesContext) {
ELContext elContext = facesContext.getELContext();
Validator validator = null;
// If "binding" is set, use it to create a validator instance.
if (binding != null) {
try {
validator = (Validator) binding.getValue(elContext);
if (validator != null) {
return validator;
}
} catch (Exception e) {
throw new FacesException(e);
}
}
// If "validatorId" is set, use it to create the validator
// instance. If "validatorId" and "binding" are both set, store the
// validator instance in the value of the property represented by
// the ValueExpression 'binding'.
if (validatorId != null) {
try {
String validatorIdVal = (String)
validatorId.getValue(elContext);
validator = facesContext.getApplication()
.createValidator(validatorIdVal);
if (validator != null && binding != null) {
binding.setValue(elContext, validator);
}
} catch (Exception e) {
throw new FacesException(e);
}
}
if (validator == null) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
MessageUtils.getExceptionMessageString(
MessageUtils.CANNOT_VALIDATE_ID,
validatorId != null ? validatorId.getExpressionString() : "",
binding != null ? binding.getExpressionString() : ""));
}
}
return validator;
}
}