refactor: avoid use of commons.lang3

Close #204

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/twincolgrid/CharSequenceUtils.java

@@ -0,0 +1,101 @@
+/*-
+ * #%L
+ * TwinColGrid add-on
+ * %%
+ * Copyright (C) 2017 - 2025 Flowing Code
+ * %%
+ * 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.
+ * #L%
+ */
+package com.flowingcode.vaadin.addons.twincolgrid;
+/*
+ * 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
+ *
+ *      https://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.
+ */
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+class CharSequenceUtils {
+
+  /**
+   * Green implementation of regionMatches.
+   *
+   * @param cs the {@link CharSequence} to be processed
+   * @param ignoreCase whether or not to be case-insensitive
+   * @param thisStart the index to start on the {@code cs} CharSequence
+   * @param substring the {@link CharSequence} to be looked for
+   * @param start the index to start on the {@code substring} CharSequence
+   * @param length character length of the region
+   * @return whether the region matched
+   * @see String#regionMatches(boolean, int, String, int, int)
+   */
+    static boolean regionMatches(final CharSequence cs, final boolean ignoreCase, final int thisStart,
+            final CharSequence substring, final int start, final int length)    {
+        if (cs instanceof String && substring instanceof String) {
+            return ((String) cs).regionMatches(ignoreCase, thisStart, (String) substring, start, length);
+        }
+        int index1 = thisStart;
+        int index2 = start;
+        int tmpLen = length;
+
+        // Extract these first so we detect NPEs the same as the java.lang.String version
+        final int srcLen = cs.length() - thisStart;
+        final int otherLen = substring.length() - start;
+
+        // Check for invalid parameters
+        if (thisStart < 0 || start < 0 || length < 0) {
+            return false;
+        }
+
+        // Check that the regions are long enough
+        if (srcLen < length || otherLen < length) {
+            return false;
+        }
+
+        while (tmpLen-- > 0) {
+            final char c1 = cs.charAt(index1++);
+            final char c2 = substring.charAt(index2++);
+
+            if (c1 == c2) {
+                continue;
+            }
+
+            if (!ignoreCase) {
+                return false;
+            }
+
+            // The real same check as in String#regionMatches(boolean, int, String, int, int):
+            final char u1 = Character.toUpperCase(c1);
+            final char u2 = Character.toUpperCase(c2);
+            if (u1 != u2 && Character.toLowerCase(u1) != Character.toLowerCase(u2)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+}

src/main/java/com/flowingcode/vaadin/addons/twincolgrid/StringUtils.java

@@ -0,0 +1,57 @@
+/*-
+ * #%L
+ * TwinColGrid add-on
+ * %%
+ * Copyright (C) 2017 - 2025 Flowing Code
+ * %%
+ * 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.
+ * #L%
+ */
+package com.flowingcode.vaadin.addons.twincolgrid;
+/*
+ * 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
+ *
+ *      https://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.
+ */
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+class StringUtils {
+
+  public static boolean containsIgnoreCase(String str, String searchStr) {
+    if (str == null || searchStr == null) {
+      return false;
+    }
+    final int len = searchStr.length();
+    final int max = str.length() - len;
+    for (int i = 0; i <= max; i++) {
+      if (CharSequenceUtils.regionMatches(str, true, i, searchStr, 0, len)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+}

src/main/java/com/flowingcode/vaadin/addons/twincolgrid/TwinColGrid.java

@@ -72,7 +72,6 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import lombok.NonNull;
-import org.apache.commons.lang3.StringUtils;
 
 @SuppressWarnings("serial")
 @JsModule(value = "./src/fc-twin-col-grid-auto-resize.js")