org.hibernate.validator.internal.constraintvalidators.bv.PatternValidator.java Source code

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Here is the source code for org.hibernate.validator.internal.constraintvalidators.bv.PatternValidator.java

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/*
 * Hibernate Validator, declare and validate application constraints
 *
 * License: Apache License, Version 2.0 See the license.txt file in the root directory or
 * <http://www.apache.org/licenses/LICENSE-2.0>.
 */

package org.hibernate.validator.internal.constraintvalidators.bv;

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Pattern.Flag;

/**
 * pattern validator.
 *
 * @author Hardy Ferentschik
 * @author Manfred Tremmel - GWT port
 */
public class PatternValidator implements ConstraintValidator<Pattern, CharSequence> {

    private static final Log LOG = LoggerFactory.make(); // NOPMD

    private RegExp pattern = null;

    @Override
    public void initialize(final Pattern parameters) {
        final Pattern.Flag[] flags = parameters.flags();
        final StringBuilder flagString = new StringBuilder();
        for (final Pattern.Flag flag : flags) {
            flagString.append(this.toString(flag));
        }
        try {
            this.pattern = RegExp.compile(parameters.regexp(), flagString.toString());
        } catch (final RuntimeException e) {
            throw LOG.getInvalidRegularExpressionException(e);
        }
    }

    @Override
    public boolean isValid(final CharSequence value, final ConstraintValidatorContext constraintValidatorContext) {
        if (value == null || this.pattern == null) {
            return true;
        }
        final MatchResult match = this.pattern.exec(value.toString());
        if (match == null) {
            return false;
        }
        // Must match the entire string
        return match.getGroup(0).length() == value.length();
    }

    private final String toString(final Flag pflag) {
        String value;
        switch (pflag) {
        case CASE_INSENSITIVE:
        case UNICODE_CASE:
            value = "i";
            break;
        case MULTILINE:
            value = "m";
            break;
        default:
            throw LOG.getIllegalArgumentException(pflag + " is not a suppoted gwt Pattern (RegExp) flag");
        }
        return value;
    }
}