Add the functionality and the unit testing for LTrim and RTrim
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Cavero Barca
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@ -9,4 +9,5 @@ This module contains articles about string operations.
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- [String toLowerCase and toUpperCase Methods in Java](https://www.baeldung.com/java-string-convert-case)
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- [Java String equalsIgnoreCase()](https://www.baeldung.com/java-string-equalsignorecase)
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- [Case-Insensitive String Matching in Java](https://www.baeldung.com/java-case-insensitive-string-matching)
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- [L-Trim and R-Trim in Java](https://www.baeldung.com/l-trim-and-r-trim-in-java)
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- More articles: [[<-- prev]](../core-java-string-operations)
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@ -0,0 +1,138 @@
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package com.baeldung.trim;
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import java.util.concurrent.TimeUnit;
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import java.util.regex.Pattern;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import com.google.common.base.CharMatcher;
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/**
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* Based on https://github.com/tedyoung/indexof-contains-benchmark
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*/
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@Fork(5)
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@State(Scope.Benchmark)
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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public class LTrimRTrim {
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private String src;
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private static String ltrimResult;
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private static String rtrimResult;
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private static Pattern LTRIM = Pattern.compile("^\\s+");
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private static Pattern RTRIM = Pattern.compile("\\s+$");
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public static void main(String[] args) throws Exception {
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org.openjdk.jmh.Main.main(args);
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}
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@Setup
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public void setup() {
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src = " White spaces left and right ";
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ltrimResult = "White spaces left and right ";
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rtrimResult = " White spaces left and right";
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}
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public static String whileLtrim(String s) {
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int i = 0;
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while (i < s.length() && Character.isWhitespace(s.charAt(i))) {
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i++;
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}
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return s.substring(i);
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}
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public static String whileRtrim(String s) {
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int i = s.length()-1;
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while (i >= 0 && Character.isWhitespace(s.charAt(i))) {
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i--;
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}
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return s.substring(0,i+1);
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}
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private static boolean checkStrings(String ltrim, String rtrim) {
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boolean result = false;
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if (ltrimResult.equalsIgnoreCase(ltrim) && rtrimResult.equalsIgnoreCase(rtrim))
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result = true;
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return result;
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}
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// Going through the String detecting Whitespaces
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@Benchmark
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public boolean whileCharacters() {
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String ltrim = whileLtrim(src);
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String rtrim = whileRtrim(src);
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return checkStrings(ltrim, rtrim);
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}
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// replaceAll() and Regular Expressions
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@Benchmark
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public boolean replaceAllRegularExpression() {
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String ltrim = src.replaceAll("^\\s+", "");
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String rtrim = src.replaceAll("\\s+$", "");
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return checkStrings(ltrim, rtrim);
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}
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public static String patternLtrim(String s) {
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return LTRIM.matcher(s).replaceAll("");
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}
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public static String patternRtrim(String s) {
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return RTRIM.matcher(s).replaceAll("");
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}
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// Pattern matches() with replaceAll
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@Benchmark
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public boolean patternMatchesLTtrimRTrim() {
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String ltrim = patternLtrim(src);
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String rtrim = patternRtrim(src);
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return checkStrings(ltrim, rtrim);
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}
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public static String guavaLtrim(String s) {
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return CharMatcher.whitespace().trimLeadingFrom(s);
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}
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public static String guavaRtrim(String s) {
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return CharMatcher.whitespace().trimTrailingFrom(s);
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}
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// Guava CharMatcher trimLeadingFrom / trimTrailingFrom
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@Benchmark
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public boolean guavaCharMatcher() {
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String ltrim = guavaLtrim(src);
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String rtrim = guavaRtrim(src);
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return checkStrings(ltrim, rtrim);
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}
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public static String stringUtilsRTrim(String str) {
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return org.apache.commons.lang3.StringUtils.stripEnd(str, " ");
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}
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public static String stringUtilsLTrim(String str) {
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return org.apache.commons.lang3.StringUtils.stripStart(str, " ");
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}
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// Apache Commons StringUtils containsIgnoreCase
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@Benchmark
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public boolean apacheCommonsStringUtils() {
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String ltrim = stringUtilsLTrim(src);
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String rtrim = stringUtilsRTrim(src);
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return checkStrings(ltrim, rtrim);
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}
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}
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@ -0,0 +1,77 @@
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package com.baeldung.trim;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Assert;
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import org.junit.Test;
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import java.util.regex.Pattern;
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/**
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* BAEL-3755: LTrim and RTrim examples.
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*/
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public class LTrimRTrimUnitTest {
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private String src = " White spaces left and right ";
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private final static String ltrimResult = "White spaces left and right ";
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private final static String rtrimResult = " White spaces left and right";
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@Test
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public void givenString_whenCallingWhileCharacters_thenReturnsTrue() {
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String ltrim = LTrimRTrim.whileLtrim(src);
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String rtrim = LTrimRTrim.whileRtrim(src);
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// Compare the Strings obtained and the expected
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Assert.assertTrue(ltrimResult.equalsIgnoreCase(ltrim));
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Assert.assertTrue(rtrimResult.equalsIgnoreCase(rtrim));
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}
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@Test
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public void givenString_whenCallingContainsWithReplaceAll_shouldReturnTrue() {
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// Use replaceAll with Regular Expressions
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String ltrim = src.replaceAll("^\\s+", "");
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String rtrim = src.replaceAll("\\s+$", "");
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// Compare the Strings obtained and the expected
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Assert.assertTrue(ltrimResult.equalsIgnoreCase(ltrim));
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Assert.assertTrue(rtrimResult.equalsIgnoreCase(rtrim));
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}
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@Test
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public void givenString_whenCallingPaternCompileMatcherReplaceAll_thenReturnsTrue() {
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// Use Pattern Compile Matcher and Find to avoid case insensitive issues
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String ltrim = LTrimRTrim.patternLtrim(src);
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String rtrim = LTrimRTrim.patternRtrim(src);
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// Compare the Strings obtained and the expected
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Assert.assertTrue(ltrimResult.equalsIgnoreCase(ltrim));
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Assert.assertTrue(rtrimResult.equalsIgnoreCase(rtrim));
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}
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@Test
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public void givenString_whenCallingGuavaCharMatcher_thenReturnsTrue() {
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// Use StringUtils containsIgnoreCase to avoid case insensitive issues
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String ltrim = LTrimRTrim.guavaLtrim(src);
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String rtrim = LTrimRTrim.guavaRtrim(src);
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// Compare the Strings obtained and the expected
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Assert.assertTrue(ltrimResult.equalsIgnoreCase(ltrim));
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Assert.assertTrue(rtrimResult.equalsIgnoreCase(rtrim));
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}
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@Test
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public void givenString_whenCallingStringUtilsStripStartEnd_thenReturnsTrue() {
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// Use StringUtils containsIgnoreCase to avoid case insensitive issues
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String ltrim = LTrimRTrim.stringUtilsLTrim(src);
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String rtrim = LTrimRTrim.stringUtilsRTrim(src);
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// Compare the Strings obtained and the expected
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Assert.assertTrue(ltrimResult.equalsIgnoreCase(ltrim));
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Assert.assertTrue(rtrimResult.equalsIgnoreCase(rtrim));
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}
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}
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