/*
* Copyright 2004-2009 the original author or authors.
*
* 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.springmodules.validation.bean.conf.loader.xml.handler;
import org.springframework.util.StringUtils;
import org.springmodules.validation.bean.conf.ValidationConfigurationException;
import org.springmodules.validation.bean.rule.AbstractValidationRule;
import org.springmodules.validation.bean.rule.ExpressionValidationRule;
import org.w3c.dom.Element;
/**
* An {@link AbstractPropertyValidationElementHandler} that can handle elements that represent valang validation rules.
* This handler creates a valang conditoin out of a <valang> element.
*
* @author Uri Boness
*/
public class ExpressionPropertyValidationElementHandler extends AbstractPropertyValidationElementHandler {
private static final String ELEMENT_NAME = "expression";
private static final String CONDITION_ATTR = "condition";
private static final String SCOPE_ATTR = "scope";
private static final String PROPERTY_SCOPE_VALUE = "property";
private static final String GLOBAL_SCOPE_VALUE = "global";
/**
* Constructs a new ExpressionPropertyValidationElementHandler.
*/
public ExpressionPropertyValidationElementHandler(String namespaceUri) {
super(ELEMENT_NAME, namespaceUri);
}
protected AbstractValidationRule createValidationRule(Element element) {
String expression = element.getAttribute(CONDITION_ATTR);
if (!StringUtils.hasText(expression)) {
throw new ValidationConfigurationException("Element '" + ELEMENT_NAME + "' must have a '" + CONDITION_ATTR + "' attribute");
}
return new ExpressionValidationRule(getConditionExpressionParser(), expression);
}
public boolean isConditionGloballyScoped(Element element) {
if (!element.hasAttribute(SCOPE_ATTR)) {
return true;
}
String value = element.getAttribute(SCOPE_ATTR);
if (GLOBAL_SCOPE_VALUE.equals(value)) {
return true;
}
if (PROPERTY_SCOPE_VALUE.equals(value)) {
return false;
}
throw new ValidationConfigurationException("Unknown value '" + value + "' for attribute '" + SCOPE_ATTR + "'");
}
}