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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * 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.rapiddweller.common.validator;

import com.rapiddweller.common.Validator;
import com.rapiddweller.common.validator.bean.AbstractConstraintValidator;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Pattern.Flag;
import java.util.HashMap;
import java.util.Map;

/**
 * Databene {@link Validator} and JSR 303 {@link ConstraintValidator} implementation
 * that validates a String by a regular expression.
 * Created at 15.07.2009 15:22:21
 *
 * @author Volker Bergmann
 * @since 0.5.0
 */
public class RegexValidator extends AbstractConstraintValidator {

  private static final Map flagConstants;

  static {
    flagConstants = new HashMap<>();
    flagConstants.put(Flag.CANON_EQ, java.util.regex.Pattern.CANON_EQ);
    flagConstants.put(Flag.CASE_INSENSITIVE, java.util.regex.Pattern.CASE_INSENSITIVE);
    flagConstants.put(Flag.COMMENTS, java.util.regex.Pattern.COMMENTS);
    flagConstants.put(Flag.DOTALL, java.util.regex.Pattern.DOTALL);
    flagConstants.put(Flag.MULTILINE, java.util.regex.Pattern.MULTILINE);
    flagConstants.put(Flag.UNICODE_CASE, java.util.regex.Pattern.UNICODE_CASE);
    flagConstants.put(Flag.UNIX_LINES, java.util.regex.Pattern.UNIX_LINES);
  }

  private String regexp;
  private Flag[] flags = new Flag[0];
  private java.util.regex.Pattern pattern;
  private boolean nullValid;

  /**
   * Instantiates a new Regex validator.
   */
  public RegexValidator() {
    this(null);
  }

  /**
   * Instantiates a new Regex validator.
   *
   * @param regexp the regexp
   */
  public RegexValidator(String regexp) {
    this(regexp, new Flag[0]);
  }

  /**
   * Instantiates a new Regex validator.
   *
   * @param regexp the regexp
   * @param flags  the flags
   */
  public RegexValidator(String regexp, Flag... flags) {
    setRegexp(regexp);
    setFlags(flags);
  }

  /**
   * Instantiates a new Regex validator.
   *
   * @param regexp    the regexp
   * @param nullValid the null valid
   * @param flags     the flags
   */
  public RegexValidator(String regexp, boolean nullValid, Flag... flags) {
    this.nullValid = nullValid;
    setRegexp(regexp);
    setFlags(flags);
  }

  /**
   * Is null valid boolean.
   *
   * @return the boolean
   */
  public boolean isNullValid() {
    return nullValid;
  }

  /**
   * Sets null valid.
   *
   * @param nullValid the null valid
   */
  public void setNullValid(boolean nullValid) {
    this.nullValid = nullValid;
  }

  @Override
  public void initialize(Pattern params) {
    setRegexp(params.regexp());
    setFlags(params.flags());
  }

  @Override
  public boolean isValid(String string, ConstraintValidatorContext context) {
    if (string == null) {
      return nullValid;
    }
    return pattern.matcher(string).matches();
  }

  /**
   * Gets regexp.
   *
   * @return the regexp
   */
  public String getRegexp() {
    return regexp;
  }

  /**
   * Sets regexp.
   *
   * @param regexp the regexp
   */
  public void setRegexp(String regexp) {
    this.regexp = regexp;
    if (this.regexp != null) {
      this.pattern = java.util.regex.Pattern.compile(regexp, flagsAsNumber());
    }
  }

  /**
   * Get flags flag [ ].
   *
   * @return the flag [ ]
   */
  public Flag[] getFlags() {
    return flags;
  }

  /**
   * Sets flags.
   *
   * @param flags the flags
   */
  public void setFlags(Flag[] flags) {
    this.flags = flags;
    if (this.regexp != null) {
      this.pattern = java.util.regex.Pattern.compile(regexp, flagsAsNumber());
    }
  }

  private int flagsAsNumber() {
    int bits = 0;
    for (Flag flag : flags) {
      bits |= flagConstants.get(flag);
    }
    return bits;
  }

  @Override
  public String toString() {
    return super.toString();
  }

}