// Copyright 2005-2007 onetsoft.com
//
// 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.onetsoft.fastjsp.valid.validator;

import com.onetsoft.fastjsp.util.StringUtils;
import com.onetsoft.fastjsp.valid.ValidationMessageProvider;
import com.onetsoft.fastjsp.valid.Validator;

import java.util.Locale;

/**
 * @author <a href="mailto:hgw@onetsoft.com">hgw</a>
 */
public class Required implements Validator {
    public final static String  MessagePatternKey= ValidationMessageProvider.REQUIRED;
    private boolean required = false;
    private static String function = "required_field";

    public Required(boolean required) {
        this.required = required;
    }

    public Object clone() {
        return new Required(required);
    }

    public String validate(String Value, Locale locale, ValidationMessageProvider provider) {
        if (required && StringUtils.isEmpty(Value))
            return getMessagePattern(locale, provider);
        else
            return null;
    }

    /**
     * 取得i18n格式化消息字符串
     * 如：{0}最多10個字符
     *
     * @param locale
     * @param provider
     * @return
     */
    public String getMessagePattern(Locale locale, ValidationMessageProvider provider) {
        return provider.getPattern(locale, ValidationMessageProvider.REQUIRED);
    }

    public String getLimit() {
        return StringUtils.EMPTY;
    }

    public String getJSFunction() {
        return function;
    }
}