/*
* 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;
import static com.alibaba.citrus.service.form.support.CompareOperator.*;
import static com.alibaba.citrus.util.Assert.*;
import static com.alibaba.citrus.util.CollectionUtil.*;
import static com.alibaba.citrus.util.StringUtil.*;
import com.alibaba.citrus.service.form.Field;
import com.alibaba.citrus.service.form.configuration.FieldConfig;
import com.alibaba.citrus.service.form.support.AbstractNumberValidator;
import com.alibaba.citrus.service.form.support.AbstractValidatorDefinitionParser;
import com.alibaba.citrus.service.form.support.CompareOperator;
import com.alibaba.citrus.service.form.support.NumberSupport;
/**
* 和另一个field比较数字的validator。
*
* @author Michael Zhou
*/
public class NumberCompareValidator extends AbstractNumberValidator {
private String fieldName;
private CompareOperator op;
/** 取得要比较的field名称。 */
public String getFieldName() {
return fieldName;
}
/** 取得比较操作的类型。 */
public CompareOperator getOp() {
return op;
}
/** 设置等于操作。 */
public void setEqualTo(String fieldName) {
setFieldName(equalTo, fieldName);
}
/** 设置不等于操作。 */
public void setNotEqualTo(String fieldName) {
setFieldName(notEqualTo, fieldName);
}
/** 设置小于操作。 */
public void setLessThan(String fieldName) {
setFieldName(lessThan, fieldName);
}
/** 设置大于操作。 */
public void setGreaterThan(String fieldName) {
setFieldName(greaterThan, fieldName);
}
/** 设置小于等于操作。 */
public void setLessThanOrEqualTo(String fieldName) {
setFieldName(lessThanOrEqualTo, fieldName);
}
/** 设置大于等于操作。 */
public void setGreaterThanOrEqualTo(String fieldName) {
setFieldName(greaterThanOrEqualTo, fieldName);
}
private void setFieldName(CompareOperator op, String fieldName) {
this.op = op;
this.fieldName = trimToNull(fieldName);
}
/**
* 验证参数并初始化。
* <p>
* 此初始化方法可以取到同组中的其它fieldConfig。
* </p>
*/
@Override
public void init(FieldConfig fieldConfig) throws Exception {
super.init(fieldConfig);
if (fieldName == null || op == null) {
throw new IllegalArgumentException("One of the following attributes should be set: "
+ asList(CompareOperator.values()));
}
assertNotNull(fieldConfig.getGroupConfig().getFieldConfig(fieldName), "Field %s not exists", fieldName);
}
/** 验证一个字段。 */
@Override
protected boolean validate(Context context, String value) {
Field fieldToCompare = assertNotNull(context.getField(fieldName), "field not found");
NumberSupport thisValue = new NumberSupport(getNumberType(), value);
NumberSupport otherValue = new NumberSupport(getNumberType(), fieldToCompare.getStringValue());
try {
return getOp().accept(thisValue.compareTo(otherValue));
} catch (IllegalArgumentException e) {
return false; // 包括NumberFormatException。如果getValue失败，验证失败。
}
}
public static class DefinitionParser extends AbstractValidatorDefinitionParser<NumberCompareValidator> {
}
}