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univocity's open source parsers for processing different text formats using a consistent API

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/*******************************************************************************
 * Copyright 2014 uniVocity Software Pty Ltd
 *
 * 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.univocity.parsers.annotations;

import java.lang.annotation.*;

import com.univocity.parsers.common.processor.*;
import com.univocity.parsers.conversions.*;

/**
 * Indicates that parsed values such as "", "?" or "null" should be interpreted as null. If a parsed value exists in {@link NullString#nulls()}, then the field must be set to null.
 * A {@link NullStringConversion}  will be assigned to this field
 * Commonly used for java beans processed using {@link BeanProcessor} and/or {@link BeanWriterProcessor}
 *
 * @see Conversion
 * @see Conversions
 * @see BeanProcessor
 * @see BeanWriterProcessor
 *
 * @author uniVocity Software Pty Ltd - [email protected]
 *
 */

@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Target(value = { ElementType.FIELD, ElementType.METHOD })
public @interface NullString {
	/**
	 * A set of Strings that represent a null value instead of a valid String (e.g. "?", "empty", "null" )
	 * @return Strings that represent {@code null}
	 */
	String[] nulls();
}