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/*
* =============================================================================
*
* Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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.thymeleaf.spring4.processor;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.servlet.support.BindStatus;
import org.springframework.web.servlet.tags.form.SelectedValueComparatorWrapper;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.model.AttributeValueQuotes;
import org.thymeleaf.model.IModel;
import org.thymeleaf.model.IModelFactory;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.model.IStandaloneElementTag;
import org.thymeleaf.processor.element.IElementTagStructureHandler;
import org.thymeleaf.spring4.requestdata.RequestDataValueProcessorUtils;
import org.thymeleaf.standard.util.StandardProcessorUtils;
import org.unbescape.html.HtmlEscape;
/**
*
* @author Daniel Fernández
*
* @since 3.0.0
*
*/
public final class SpringInputCheckboxFieldTagProcessor
extends AbstractSpringFieldTagProcessor {
public static final String CHECKBOX_INPUT_TYPE_ATTR_VALUE = "checkbox";
public SpringInputCheckboxFieldTagProcessor(final String dialectPrefix) {
super(dialectPrefix, INPUT_TAG_NAME, TYPE_ATTR_NAME, new String[] { CHECKBOX_INPUT_TYPE_ATTR_VALUE }, true);
}
@Override
protected void doProcess(final ITemplateContext context,
final IProcessableElementTag tag,
final AttributeName attributeName, final String attributeValue,
final BindStatus bindStatus, final IElementTagStructureHandler structureHandler) {
String name = bindStatus.getExpression();
name = (name == null? "" : name);
final String id = computeId(context, tag, name, true);
String value = null;
boolean checked = false;
Object boundValue = bindStatus.getValue();
final Class valueType = bindStatus.getValueType();
if (Boolean.class.equals(valueType) || boolean.class.equals(valueType)) {
if (boundValue instanceof String) {
boundValue = Boolean.valueOf((String) boundValue);
}
final Boolean booleanValue = (boundValue != null ? (Boolean) boundValue : Boolean.FALSE);
value = "true";
checked = booleanValue.booleanValue();
} else {
value = tag.getAttributeValue(this.valueAttributeDefinition.getAttributeName());
if (value == null) {
throw new TemplateProcessingException(
"Attribute \"value\" is required in \"input(checkbox)\" tags " +
"when binding to non-boolean values");
}
checked = SelectedValueComparatorWrapper.isSelected(bindStatus, HtmlEscape.unescapeHtml(value));
}
StandardProcessorUtils.setAttribute(structureHandler, this.idAttributeDefinition, ID_ATTR_NAME, id); // No need to escape: this comes from an existing 'id' or from a token
StandardProcessorUtils.setAttribute(structureHandler, this.nameAttributeDefinition, NAME_ATTR_NAME, name); // No need to escape: this is a java-valid token
StandardProcessorUtils.setAttribute(
structureHandler, this.valueAttributeDefinition, VALUE_ATTR_NAME, RequestDataValueProcessorUtils.processFormFieldValue(context, name, value, "checkbox"));
if (checked) {
StandardProcessorUtils.setAttribute(structureHandler, this.checkedAttributeDefinition, CHECKED_ATTR_NAME, CHECKED_ATTR_NAME);
} else {
structureHandler.removeAttribute(this.checkedAttributeDefinition.getAttributeName());
}
if (!isDisabled(tag)) {
/*
* Non-disabled checkboxes need an additional in order to note their presence in
* the HTML document. Given unchecked checkboxes are not sent by browsers as a result of form submission,
* this is the only way to differentiate between a checkbox that is unchecked and a checkbox that was
* never displayed or is disabled.
*/
final IModelFactory modelFactory = context.getModelFactory();
final IModel hiddenTagModel = modelFactory.createModel();
final String hiddenName = WebDataBinder.DEFAULT_FIELD_MARKER_PREFIX + name;
final String hiddenValue = "on";
final Map hiddenAttributes = new LinkedHashMap(4,1.0f);
hiddenAttributes.put(TYPE_ATTR_NAME, "hidden");
hiddenAttributes.put(NAME_ATTR_NAME, hiddenName);
hiddenAttributes.put(VALUE_ATTR_NAME, RequestDataValueProcessorUtils.processFormFieldValue(context, hiddenName, hiddenValue, "hidden"));
final IStandaloneElementTag hiddenTag =
modelFactory.createStandaloneElementTag(INPUT_TAG_NAME, hiddenAttributes, AttributeValueQuotes.DOUBLE, false, true);
hiddenTagModel.add(hiddenTag);
structureHandler.insertImmediatelyAfter(hiddenTagModel, false);
}
}
private final boolean isDisabled(final IProcessableElementTag tag) {
// Disabled = attribute "disabled" exists
return tag.hasAttribute(this.disabledAttributeDefinition.getAttributeName());
}
}
