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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// Copyright 2007, 2008, 2009, 2010 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.internal;
import org.apache.tapestry5.*;
import org.apache.tapestry5.dom.Element;
import org.apache.tapestry5.services.Environment;
import org.apache.tapestry5.services.FormSupport;
/**
* Default implementation that writes an attribute into fields or labels that are in error.
*/
public final class DefaultValidationDecorator extends BaseValidationDecorator
{
private final Environment environment;
private final Asset spacerAsset;
private final MarkupWriter markupWriter;
/**
* @param environment
* used to locate objects and services during the render
* @param spacerAsset
* asset for a one-pixel spacer image used as a placeholder for the error marker icon
* @param markupWriter
*/
public DefaultValidationDecorator(Environment environment, Asset spacerAsset, MarkupWriter markupWriter)
{
this.environment = environment;
this.spacerAsset = spacerAsset;
this.markupWriter = markupWriter;
}
@Override
public void insideField(Field field)
{
if (inError(field))
addErrorClassToCurrentElement();
}
@Override
public void insideLabel(Field field, Element element)
{
if (field == null)
return;
if (inError(field))
element.addClassName(CSSClassConstants.ERROR);
}
/**
* Writes an icon for field after the field. The icon has the same id as the field, with ":icon" appended. This is
* expected by the default client-side JavaScript. The icon's src is a blank spacer image (this is to allow the
* image displayed to be overridden via CSS). The icon's CSS class is "t-error-icon", with "t-invisible" added
* if the field is not in error when rendered. If client validation is not enabled for the form containing the
* field and the field is not in error, then the error icon itself is not rendered.
*
* @param field
* which just completed rendering itself
*/
@Override
public void afterField(Field field)
{
boolean inError = inError(field);
boolean clientValidationEnabled = getFormSupport().isClientValidationEnabled();
if (inError || clientValidationEnabled)
{
String iconId = field.getClientId() + "_icon";
String cssClass = inError ? "t-error-icon" : "t-error-icon t-invisible";
markupWriter.element("img", "src", spacerAsset.toClientURL(), "alt", "", "class", cssClass, "id", iconId);
markupWriter.end();
}
}
private FormSupport getFormSupport()
{
return environment.peekRequired(FormSupport.class);
}
private boolean inError(Field field)
{
ValidationTracker tracker = environment.peekRequired(ValidationTracker.class);
return tracker.inError(field);
}
private void addErrorClassToCurrentElement()
{
markupWriter.getElement().addClassName(CSSClassConstants.ERROR);
}
}