tech.tablesaw.columns.strings.StringPredicates Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of tablesaw-core Show documentation
There is a newer version: 0.43.1
/*
 * 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 tech.tablesaw.columns.strings;

import tech.tablesaw.util.StringUtils;

import java.util.function.BiPredicate;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringPredicates {

    public static final Predicate isMissing = i -> i.equals(StringColumnType.missingValueIndicator());

    public static final Predicate isNotMissing = i -> !i.equals(StringColumnType.missingValueIndicator());

    public static final Predicate isUpperCase = StringUtils::isAllUpperCase;

    public static final Predicate isLowerCase = StringUtils::isAllLowerCase;

    public static final BiPredicate startsWith = String::startsWith;

    public static final BiPredicate endsWith = String::endsWith;

    public static final BiPredicate stringContains = String::contains;

    public static final BiPredicate matchesRegex = (String valueToTest, String valueToCompareAgainst) -> {
        Pattern p = Pattern.compile(valueToCompareAgainst);
        Matcher m = p.matcher(valueToTest);
        return (m.matches());
    };

    public static final BiPredicate isEqualTo = String::equals;

    public static final BiPredicate isNotEqualTo = (valueToTest, valueToCompareAgainst) -> !valueToTest.equals(valueToCompareAgainst);

    public static final BiPredicate isEqualToIgnoringCase = String::equalsIgnoreCase;

    public static final Predicate isAlpha = StringUtils::isAlpha;

    public static final Predicate isAlphaNumeric = StringUtils::isAlphanumeric;

    public static final Predicate isNumeric = StringUtils::isNumeric;

    public static final Predicate isEmpty = e -> e.length() == 0;

    public static final BiPredicate isLongerThan = (valueToTest, valueToCompareAgainst) -> valueToTest.length() > valueToCompareAgainst;

    public static final BiPredicate isShorterThan = (valueToTest, valueToCompareAgainst) -> valueToTest.length() < valueToCompareAgainst;

    public static final BiPredicate hasEqualLengthTo = (valueToTest, valueToCompareAgainst) -> valueToTest.length() == valueToCompareAgainst;
}