// Copyright 2006, 2007, 2008, 2012, 2014 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.tapestry5.validator;
import org.apache.tapestry5.Field;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.ValidationException;
import org.apache.tapestry5.ioc.MessageFormatter;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import org.apache.tapestry5.services.FormSupport;
import org.apache.tapestry5.services.Html5Support;
import org.apache.tapestry5.services.javascript.DataConstants;
import org.apache.tapestry5.services.javascript.JavaScriptSupport;
/**
* A validator that enforces that the value is not null and not the empty string. This validator is not configurable.
*/
public final class Required extends AbstractValidator<Void, Object>
{
final private Html5Support html5Support;
public Required(JavaScriptSupport javaScriptSupport, Html5Support html5Support)
{
super(null, Object.class, "required", javaScriptSupport);
this.html5Support = html5Support;
}
public void validate(Field field, Void constraintValue, MessageFormatter formatter, Object value)
throws ValidationException
{
if (value == null || InternalUtils.isEmptyCollection(value) || InternalUtils.isBlank(value.toString()))
throw new ValidationException(buildMessage(formatter, field));
}
private String buildMessage(MessageFormatter formatter, Field field)
{
return formatter.format(field.getLabel());
}
/**
* The exception to the rule.
*/
public boolean isRequired()
{
return true;
}
public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter writer,
FormSupport formSupport)
{
if (formSupport.isClientValidationEnabled())
{
javaScriptSupport.require("t5/core/validation");
writer.attributes(
DataConstants.VALIDATION_ATTRIBUTE, true,
"data-optionality", "required",
"data-required-message", buildMessage(formatter, field));
}
if (html5Support.isHtml5SupportEnabled())
{
writer.attributes("required", "required");
}
}
}