Убраны пересекающиеся матчи

src/main/java/ru/serega6531/packmate/service/PatternMatcher.java

@@ -0,0 +1,107 @@
+package ru.serega6531.packmate.service;
+
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.security.crypto.codec.Hex;
+import ru.serega6531.packmate.model.FoundPattern;
+import ru.serega6531.packmate.model.Pattern;
+import ru.serega6531.packmate.model.enums.PatternSearchType;
+import ru.serega6531.packmate.utils.Bytes;
+
+import java.util.*;
+import java.util.regex.Matcher;
+
+public class PatternMatcher {
+
+    private static final Map<String, java.util.regex.Pattern> compiledPatterns = new HashMap<>();
+
+    private final byte[] contentBytes;
+    private final String content;
+    private final List<Pattern> patterns;
+
+    private final Set<FoundPattern> result = new HashSet<>();
+
+    public PatternMatcher(byte[] contentBytes, List<Pattern> patterns) {
+        this.contentBytes = contentBytes;
+        this.content = new String(contentBytes);
+        this.patterns = patterns;
+    }
+
+    public Set<FoundPattern> findMatches() {
+        patterns.forEach(this::match);
+        return result;
+    }
+
+    private void match(Pattern pattern) {
+        if (pattern.getSearchType() == PatternSearchType.REGEX) {
+            final java.util.regex.Pattern regex = compilePattern(pattern);
+            final Matcher matcher = regex.matcher(content);
+            int startPos = 0;
+
+            while (matcher.find(startPos)) {
+                addIfPossible(FoundPattern.builder()
+                        .patternId(pattern.getId())
+                        .startPosition(matcher.start())
+                        .endPosition(matcher.end() - 1)
+                        .build());
+                startPos = matcher.end();
+            }
+        } else if (pattern.getSearchType() == PatternSearchType.SUBSTRING) {
+            int startSearch = 0;
+            final String value = pattern.getValue();
+
+            while (true) {
+                int start = StringUtils.indexOfIgnoreCase(content, value, startSearch);
+
+                if (start == -1) {
+                    return;
+                }
+
+                int end = start + value.length() - 1;
+                addIfPossible(FoundPattern.builder()
+                        .patternId(pattern.getId())
+                        .startPosition(start)
+                        .endPosition(end)
+                        .build());
+
+                startSearch = end + 1;
+            }
+        } else {  // SUBBYTES
+            int startSearch = 0;
+            final byte[] value = Hex.decode(pattern.getValue());
+
+            while (true) {
+                int start = Bytes.indexOf(contentBytes, value, startSearch, contentBytes.length);
+
+                if (start == -1) {
+                    return;
+                }
+
+                int end = start + value.length - 1;
+                addIfPossible(FoundPattern.builder()
+                        .patternId(pattern.getId())
+                        .startPosition(start)
+                        .endPosition(end)
+                        .build());
+
+                startSearch = end + 1;
+            }
+        }
+    }
+
+    private void addIfPossible(FoundPattern found) {
+        if (result.stream().noneMatch(match -> between(match.getStartPosition(), match.getEndPosition(), found.getStartPosition()) ||
+                between(match.getStartPosition(), match.getEndPosition(), found.getEndPosition()))) {
+            result.add(found);
+        }
+    }
+
+    private boolean between(int a, int b, int x) {
+        return a <= x && x <= b;
+    }
+
+
+    private java.util.regex.Pattern compilePattern(Pattern pattern) {
+        return compiledPatterns.computeIfAbsent(pattern.getValue(), java.util.regex.Pattern::compile);
+    }
+
+}