/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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 com.alibaba.citrus.service.form.impl.validation.composite;
import static com.alibaba.citrus.springext.util.DomUtil.*;
import static com.alibaba.citrus.springext.util.SpringExtUtil.*;
import static com.alibaba.citrus.util.Assert.*;
import static com.alibaba.citrus.util.StringUtil.*;
import java.util.Iterator;
import java.util.List;
import com.alibaba.citrus.service.form.Condition;
import com.alibaba.citrus.service.form.Validator;
import com.alibaba.citrus.service.form.impl.condition.JexlCondition;
import com.alibaba.citrus.service.form.support.AbstractCompositeValidator;
import com.alibaba.citrus.service.form.support.AbstractCompositeValidatorDefinitionParser;
import com.alibaba.citrus.service.form.support.AbstractSimpleCompositeValidator;
import com.alibaba.citrus.springext.ConfigurationPoint;
import com.alibaba.citrus.springext.Contribution;
import com.alibaba.citrus.springext.ContributionAware;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;
/**
* 支持多条件分支的validator。
*
* @author Michael Zhou
*/
public class ChooseValidator extends AbstractCompositeValidator {
@Override
protected boolean requiresMessage() {
return false;
}
@Override
protected void init() throws Exception {
List<Validator> validators = getValidators();
assertTrue(!validators.isEmpty(), "no validators");
for (Iterator<Validator> i = validators.iterator(); i.hasNext(); ) {
Validator validator = i.next();
if (i.hasNext()) {
assertTrue(validator instanceof When, "expected <when>");
} else {
assertTrue(validator instanceof When || validator instanceof Otherwise,
"expected <when> or <otherwise>");
}
}
}
public boolean validate(Context context) {
for (Validator validator : getValidators()) {
if (validator instanceof When) {
When when = (When) validator;
Condition cond = when.condition;
if (cond.isSatisfied(context)) {
return when.validateInChoose(context);
}
} else if (validator instanceof Otherwise) {
Otherwise ow = (Otherwise) validator;
return ow.validateInChoose(context);
}
}
return true;
}
public static class When extends AbstractSimpleCompositeValidator {
private Condition condition;
public void setCondition(Condition condition) {
this.condition = condition;
}
@Override
protected boolean requiresMessage() {
return false;
}
@Override
protected void init() throws Exception {
super.init();
assertNotNull(condition, "no condition");
}
public boolean validate(Context context) {
throw new UnsupportedOperationException();
}
boolean validateInChoose(Context context) {
return doValidate(context);
}
}
public static class Otherwise extends AbstractSimpleCompositeValidator {
@Override
protected boolean requiresMessage() {
return false;
}
public boolean validate(Context context) {
throw new UnsupportedOperationException();
}
boolean validateInChoose(Context context) {
return doValidate(context);
}
}
public static class DefinitionParser extends AbstractCompositeValidatorDefinitionParser<ChooseValidator> implements
ContributionAware {
private ConfigurationPoint conditionConfigurationPoint;
@Override
public void setContribution(Contribution contrib) {
super.setContribution(contrib);
this.conditionConfigurationPoint = getSiblingConfigurationPoint("services/form/conditions", contrib);
}
@Override
protected void doParseElement(Element element, ParserContext parserContext, BeanDefinitionBuilder chooseBuilder) {
ElementSelector whenSelector = and(sameNs(element), name("when"));
ElementSelector otherwiseSelector = and(sameNs(element), name("otherwise"));
List<Object> validators = createManagedList(element, parserContext);
for (Element subElement : subElements(element)) {
if (whenSelector.accept(subElement)) {
validators.add(parseWhen(subElement, parserContext));
} else if (otherwiseSelector.accept(subElement)) {
validators.add(parseOtherwise(subElement, parserContext));
}
}
chooseBuilder.addPropertyValue("validators", validators);
}
private Object parseWhen(Element element, ParserContext parserContext) {
BeanDefinitionBuilder whenBuilder = BeanDefinitionBuilder.genericBeanDefinition(When.class);
super.doParseElement(element, parserContext, whenBuilder);
String testExpr = trimToNull(element.getAttribute("test"));
if (testExpr != null) {
BeanDefinitionBuilder jexlCondition = BeanDefinitionBuilder.genericBeanDefinition(JexlCondition.class);
jexlCondition.addConstructorArgValue(testExpr);
whenBuilder.addPropertyValue("condition", jexlCondition.getBeanDefinition());
}
for (Element subElement : subElements(element)) {
Object condition = parseConfigurationPointBean(subElement, conditionConfigurationPoint, parserContext,
whenBuilder);
if (condition != null) {
whenBuilder.addPropertyValue("condition", condition);
break;
}
}
return whenBuilder.getBeanDefinition();
}
private Object parseOtherwise(Element element, ParserContext parserContext) {
BeanDefinitionBuilder otherwiseBuilder = BeanDefinitionBuilder.genericBeanDefinition(Otherwise.class);
super.doParseElement(element, parserContext, otherwiseBuilder);
return otherwiseBuilder.getBeanDefinition();
}
}
}