Validator.java

/*
 * Copyright 2004-2010 the Seasar Foundation and the Others.
 *
 * 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.slim3.controller.validator;

import java.util.Map;

/**
 * An interface to validate an input value.
 * 
 * @author higa
 * @since 1.0.0
 * 
 */
public interface Validator {

    /**
     * Validates the input value;
     * 
     * @param parameters
     *            the parameters
     * @param name
     *            the name
     * 
     * @return the error message if the input value is invalid.
     */
    String validate(Map<String, Object> parameters, String name);
}