// Copyright 2005 The Apache Software Foundation
//
// 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 org.apache.tapestry.form;
import java.util.Iterator;
import java.util.Locale;
import org.apache.hivemind.HiveMind;
import org.apache.hivemind.service.ThreadLocale;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.coerce.ValueConverter;
import org.apache.tapestry.form.validator.Validator;
import org.apache.tapestry.valid.IValidationDelegate;
import org.apache.tapestry.valid.ValidatorException;
/**
* Default {@link VadidatableFieldSupport} implementation. This implementation generates calls to a
* static javascript function during render if client-side validation is enabled.
*
* @author Paul Ferraro
* @since 4.0
*/
public class ValidatableFieldSupportImpl implements ValidatableFieldSupport
{
private ValueConverter _converter;
private ThreadLocale _threadLocale;
public void setValueConverter(ValueConverter converter)
{
_converter = converter;
}
public void setThreadLocale(ThreadLocale threadLocale)
{
_threadLocale = threadLocale;
}
protected Iterator getValidatorsIterator(ValidatableField component)
{
return (Iterator) _converter.coerceValue(component.getValidators(), Iterator.class);
}
/**
* @see org.apache.tapestry.form.ValidatableFieldSupport#render(org.apache.tapestry.form.ValidatableField,
* org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
*/
public void render(ValidatableField component, IMarkupWriter writer, IRequestCycle cycle)
{
IValidationDelegate delegate = component.getForm().getDelegate();
String value = delegate.isInError() ? delegate.getFieldInputValue()
: getTranslatedValue(component);
component.render(writer, cycle, value);
}
/**
* @see org.apache.tapestry.form.ValidatableFieldSupport#renderContributions(org.apache.tapestry.form.ValidatableField,
* org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
*/
public void renderContributions(ValidatableField component, IMarkupWriter writer,
IRequestCycle cycle)
{
if (component.getForm().isClientValidationEnabled())
{
Locale locale = component.getPage().getLocale();
FormComponentContributorContext context = new FormComponentContributorContextImpl(
locale, cycle, component);
component.getTranslator().renderContribution(writer, cycle, context, component);
Iterator validators = getValidatorsIterator(component);
while (validators.hasNext())
{
Validator validator = (Validator) validators.next();
validator.renderContribution(writer, cycle, context, component);
}
}
}
protected String getTranslatedValue(ValidatableField component)
{
Object value = component.readValue();
return (value != null) ? component.getTranslator().format(component, value) : "";
}
/**
* @see org.apache.tapestry.form.ValidatableFieldSupport#bind(org.apache.tapestry.form.ValidatableField,
* org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle, java.lang.String)
*/
public void bind(ValidatableField component, IMarkupWriter writer, IRequestCycle cycle,
String value)
{
IValidationDelegate delegate = component.getForm().getDelegate();
delegate.recordFieldInputValue(value);
try
{
Object object = HiveMind.isBlank(value) ? null : component.getTranslator().parse(
component,
value);
boolean isNonNull = object != null;
Iterator validators = getValidatorsIterator(component);
ValidationMessages messages = new ValidationMessagesImpl(_threadLocale.getLocale());
while (validators.hasNext())
{
Validator validator = (Validator) validators.next();
if (isNonNull || validator.getAcceptsNull())
validator.validate(component, messages, object);
}
// Only get here if it translated OK and then validated OK.
// NOTE: May need to have the Translator implement a provideNullValue() method, i.e.,
// to return 0 if the translator is concerned with numbers.
component.writeValue(object);
}
catch (ValidatorException ex)
{
delegate.record(ex);
}
}
}