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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to you 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 javax.validation.constraints;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Constraint to verify that the validated field, parameter, etc matches the given regexp pattern.
 * The pattern format is as specified in {@link java.util.regex.Pattern}.
 *
 * @version $Rev$ $Date$
 */
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = {})
public @interface Pattern {
    
    String regexp();

    Flag[] flags() default {};

    String message() default "{javax.validation.constraints.Pattern.message}";

    Class[] groups() default {};

    Class[] payload() default {};

    enum Flag {

        UNIX_LINES(java.util.regex.Pattern.UNIX_LINES),

        CASE_INSENSITIVE(java.util.regex.Pattern.CASE_INSENSITIVE),

        COMMENTS(java.util.regex.Pattern.COMMENTS),

        MULTILINE(java.util.regex.Pattern.MULTILINE),

        DOTALL(java.util.regex.Pattern.DOTALL),

        UNICODE_CASE(java.util.regex.Pattern.UNICODE_CASE),

        CANON_EQ(java.util.regex.Pattern.CANON_EQ);

        private final int value;

        Flag(int value) {
            this.value = value;
        }

        public int getValue() {
            return value;
        }
    }

    @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
    @Retention(RUNTIME)
    @Documented
    @interface List {
        Pattern[] value();
    }
}