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Address reviewer feedback on PR #391
Implemented all suggestions from @AlexanderAshitkin: 1. **Extracted filtering logic to utility class** - Created ArrayFilterUtils with pattern caching - Removed inline filtering methods from BuildCacheMojosExecutionStrategy 2. **Changed pattern matching from find() to matches()** - Ensures exact pattern matching (e.g., "\d+" matches "123" but not "Maven4") - Addresses reviewer's concern about unexpected substring matches 3. **Added pattern caching** - Uses ConcurrentHashMap to cache compiled patterns - Improves performance for repeated pattern usage 4. **Renamed variable to excludePattern** - More descriptive than generic "pattern" 5. **Removed filterArrayString() method** - Simplified approach: only filter current values, not cached values - When ignore pattern changes, cache rebuilds naturally 6. **Added proper imports** - Eliminated fully qualified names (FQNs) - All imports are at the top of the file 7. **Comprehensive unit tests** - 13 test cases covering all scenarios - Tests verify matches() vs find() behavior - Tests validate pattern caching - All 87 tests pass (existing + new)
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‎src/main/java/org/apache/maven/buildcache/ArrayFilterUtils.java‎

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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.apache.maven.buildcache;
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import java.lang.reflect.Array;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.regex.Pattern;
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import org.apache.commons.lang3.ArrayUtils;
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/**
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* Utility class for filtering array elements based on regex patterns.
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*/
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public final class ArrayFilterUtils {
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private static final ConcurrentHashMap<String, Pattern> PATTERN_CACHE = new ConcurrentHashMap<>();
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private ArrayFilterUtils() {
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// Utility class
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}
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/**
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* Filters array values based on exclude pattern and converts to string representation.
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*
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* @param array the array to filter
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* @param excludePattern the regex pattern to match elements to exclude (null to disable filtering)
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* @return string representation of the filtered array
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*/
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public static String filterAndStringifyArray(Object array, String excludePattern) {
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if (excludePattern == null) {
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return ArrayUtils.toString(array);
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}
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Pattern pattern = getOrCompilePattern(excludePattern);
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List<Object> filtered = new ArrayList<>();
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int length = Array.getLength(array);
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for (int i = 0; i < length; i++) {
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Object element = Array.get(array, i);
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String elementStr = String.valueOf(element);
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if (!pattern.matcher(elementStr).matches()) {
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filtered.add(element);
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}
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}
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return filtered.toString();
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}
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/**
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* Gets a compiled pattern from cache or compiles and caches it.
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*
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* @param regex the regex pattern string
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* @return compiled Pattern object
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*/
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private static Pattern getOrCompilePattern(String regex) {
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return PATTERN_CACHE.computeIfAbsent(regex, Pattern::compile);
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}
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/**
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* Clears the pattern cache. Primarily for testing purposes.
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*/
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static void clearPatternCache() {
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PATTERN_CACHE.clear();
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}
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}

‎src/main/java/org/apache/maven/buildcache/BuildCacheMojosExecutionStrategy.java‎

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import java.util.Map;
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import java.util.Set;
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import org.apache.commons.lang3.ArrayUtils;
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import org.apache.commons.lang3.Strings;
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import org.apache.maven.SessionScoped;
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import org.apache.maven.buildcache.artifact.ArtifactRestorationReport;
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Path baseDirPath = project.getBasedir().toPath();
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currentValue = normalizedPath(((Path) value), baseDirPath);
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} else if (value != null && value.getClass().isArray()) {
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currentValue = filterAndStringifyArray(value, trackedProperty.getIgnorePattern());
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currentValue = ArrayFilterUtils.filterAndStringifyArray(value, trackedProperty.getIgnorePattern());
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} else {
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currentValue = String.valueOf(value);
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}
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return false;
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}
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// Apply ignorePattern filtering to expected value if it's an array string representation
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String filteredExpectedValue = expectedValue;
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if (trackedProperty.getIgnorePattern() != null && expectedValue.startsWith("[") && expectedValue.endsWith("]")) {
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filteredExpectedValue = filterArrayString(expectedValue, trackedProperty.getIgnorePattern());
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}
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if (!Strings.CS.equals(currentValue, filteredExpectedValue)) {
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if (!Strings.CS.equals(currentValue, expectedValue)) {
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if (!Strings.CS.equals(currentValue, trackedProperty.getSkipValue())) {
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LOGGER.info(
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"Plugin parameter mismatch found. Parameter: {}, expected: {}, actual: {}",
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return normalizedPath;
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}
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/**
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* Filters array values based on ignore pattern and converts to string representation.
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*/
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private static String filterAndStringifyArray(Object array, String ignorePattern) {
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if (ignorePattern == null) {
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return ArrayUtils.toString(array);
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}
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java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(ignorePattern);
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java.util.List<Object> filtered = new java.util.ArrayList<>();
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int length = java.lang.reflect.Array.getLength(array);
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for (int i = 0; i < length; i++) {
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Object element = java.lang.reflect.Array.get(array, i);
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String elementStr = String.valueOf(element);
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if (!pattern.matcher(elementStr).find()) {
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filtered.add(element);
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}
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}
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return filtered.toString();
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}
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/**
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* Filters an array string representation (e.g., "[a, b, c]") based on ignore pattern.
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*/
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private static String filterArrayString(String arrayStr, String ignorePattern) {
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if (ignorePattern == null || !arrayStr.startsWith("[") || !arrayStr.endsWith("]")) {
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return arrayStr;
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}
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java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(ignorePattern);
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String content = arrayStr.substring(1, arrayStr.length() - 1);
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if (content.trim().isEmpty()) {
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return "[]";
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}
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String[] elements = content.split(",\\s*");
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java.util.List<String> filtered = new java.util.ArrayList<>();
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for (String element : elements) {
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if (!pattern.matcher(element.trim()).find()) {
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filtered.add(element.trim());
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}
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}
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return filtered.toString();
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}
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private enum CacheRestorationStatus {
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SUCCESS,
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FAILURE,

‎src/test/java/org/apache/maven/buildcache/ArrayFilterUtilsTest.java‎

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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.apache.maven.buildcache;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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class ArrayFilterUtilsTest {
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@AfterEach
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void clearCache() {
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ArrayFilterUtils.clearPatternCache();
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}
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@Test
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void testFilterAndStringifyArrayWithNullPattern() {
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String[] array = new String[] {"--module-version", "1.0.0", "-g"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, null);
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assertEquals("{--module-version,1.0.0,-g}", result);
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}
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@Test
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void testFilterAndStringifyArrayWithMatchingPattern() {
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String[] array = new String[] {"--module-version", "1.0.0", "-g", "--module-version"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-version");
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assertEquals("[1.0.0, -g]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithPartialMatchPattern() {
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// Test that matches() is used instead of find()
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// Pattern "\\d+" should only match pure numbers like "123", not "Maven4"
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String[] array = new String[] {"123", "Maven4", "456", "abc"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "\\d+");
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// Should keep "Maven4" and "abc" because they don't fully match \d+
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assertEquals("[Maven4, abc]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithRegexPattern() {
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String[] array = new String[] {"--module-version", "1.0.0", "--release", "21", "-g"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-.*");
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assertEquals("[1.0.0, --release, 21, -g]", result);
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}
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@Test
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void testFilterAndStringifyArrayRemovesAllElements() {
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String[] array = new String[] {"test", "test", "test"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "test");
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assertEquals("[]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithNoMatches() {
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String[] array = new String[] {"-g", "-verbose", "-parameters"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-version");
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assertEquals("[-g, -verbose, -parameters]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithEmptyArray() {
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String[] array = new String[] {};
81+
String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-version");
82+
assertEquals("[]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithIntArray() {
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int[] array = new int[] {1, 2, 3, 4, 5};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "3");
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assertEquals("[1, 2, 4, 5]", result);
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}
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@Test
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void testFilterAndStringifyArrayWithComplexPattern() {
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String[] array = new String[] {"--module-version", "1.0.0", "--add-exports", "module/package"};
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-version|--add-exports");
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assertEquals("[1.0.0, module/package]", result);
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}
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@Test
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void testPatternCaching() {
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// First call should cache the pattern
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String[] array1 = new String[] {"--module-version", "1.0.0"};
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String result1 = ArrayFilterUtils.filterAndStringifyArray(array1, "--module-version");
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// Second call with same pattern should use cached version
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String[] array2 = new String[] {"--module-version", "2.0.0", "-g"};
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String result2 = ArrayFilterUtils.filterAndStringifyArray(array2, "--module-version");
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109+
assertEquals("[1.0.0]", result1);
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assertEquals("[2.0.0, -g]", result2);
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}
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@Test
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void testMatchesVsFindBehavior() {
115+
// Test that pattern must match the entire string, not just find a substring
116+
String[] array = new String[] {"--module-version-extended", "--module-version", "abc"};
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// Pattern should only match exact "--module-version", not "--module-version-extended"
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String result = ArrayFilterUtils.filterAndStringifyArray(array, "--module-version");
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// Using matches(), only exact match is excluded
122+
assertEquals("[--module-version-extended, abc]", result);
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}
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@Test
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void testNumericPatternExactMatch() {
127+
// Regression test for reviewer's concern about \\d+ matching "Maven4"
128+
String[] array = new String[] {"123", "Maven4", "7", "test123"};
129+
String result = ArrayFilterUtils.filterAndStringifyArray(array, "\\d+");
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// \\d+ with matches() should only exclude pure numbers "123" and "7"
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// Should keep "Maven4" and "test123" since they don't fully match
133+
assertEquals("[Maven4, test123]", result);
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}
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@Test
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void testMaven4ModuleVersionUseCase() {
138+
// Real-world test case from the PR description
139+
String[] compilerArgs = new String[] {
140+
"-parameters",
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"--module-version",
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"1.0.0-SNAPSHOT",
143+
"-g"
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};
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String result = ArrayFilterUtils.filterAndStringifyArray(compilerArgs, "--module-version|.*SNAPSHOT.*");
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// Should filter out both "--module-version" and "1.0.0-SNAPSHOT"
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assertEquals("[-parameters, -g]", result);
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}
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}

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