Code cleanup

Author: ahornace

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/AnalyzerGuru.java

@@ -187,20 +187,17 @@ public class AnalyzerGuru {
     /**
      * Descending string length comparator for magics.
      */
-    private static final Comparator<String> descStrlenComparator =
-        new Comparator<String>() {
-        @Override public int compare(String s1, String s2) {
-            // DESC: s2 length <=> s1 length
-            int cmp = Integer.compare(s2.length(), s1.length());
-            if (cmp != 0) {
-                return cmp;
-            }
-
-            // the Comparator must also be "consistent with equals", so check
-            // string contents too when (length)cmp == 0. (ASC: s1 <=> s2.)
-            cmp = s1.compareTo(s2);
+    private static final Comparator<String> descStrlenComparator = (s1, s2) -> {
+        // DESC: s2 length <=> s1 length
+        int cmp = Integer.compare(s2.length(), s1.length());
+        if (cmp != 0) {
             return cmp;
         }
+
+        // the Comparator must also be "consistent with equals", so check
+        // string contents too when (length)cmp == 0. (ASC: s1 <=> s2.)
+        cmp = s1.compareTo(s2);
+        return cmp;
     };
 
     /**

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/AnalyzerGuruHelp.java

@@ -26,6 +26,7 @@
 import org.opengrok.indexer.util.StringUtils;
 
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -182,40 +183,31 @@ private static String[] splitLines(String str, int width) {
             b.setLength(0);
         }
 
-        return res.stream().toArray(String[]::new);
+        return res.toArray(String[]::new);
     }
 
     private static List<MappedFactory> byKey(Map<String, AnalyzerFactory> mapped) {
-
-        List<MappedFactory> res = mapped.entrySet().stream().map((t) -> {
-            return new MappedFactory(t.getKey(), t.getValue());
-        }).collect(Collectors.toList());
-
-        res.sort((mf1, mf2) -> {
-            return mf1.key.toLowerCase(Locale.ROOT).compareTo(
-                mf2.key.toLowerCase(Locale.ROOT));
-        });
-        return res;
+        return mapped.entrySet().stream()
+                .map(t -> new MappedFactory(t.getKey(), t.getValue()))
+                .sorted(Comparator.comparing(mf -> mf.key.toLowerCase(Locale.ROOT)))
+                .collect(Collectors.toList());
     }
 
     private static List<MappedFactory> byFactory(Map<String, AnalyzerFactory> mapped) {
-
-        List<MappedFactory> res = mapped.entrySet().stream().map((t) -> {
-            return new MappedFactory(t.getKey(), t.getValue());
-        }).collect(Collectors.toList());
-
-        res.sort((mf1, mf2) -> {
-            String r1 = reportable(mf1.fac);
-            String r2 = reportable(mf2.fac);
-            int cmp = r1.toLowerCase(Locale.ROOT).compareTo(
-                r2.toLowerCase(Locale.ROOT));
-            if (cmp != 0) {
-                return cmp;
-            }
-            return mf1.key.toLowerCase(Locale.ROOT).compareTo(
-                mf2.key.toLowerCase(Locale.ROOT));
-        });
-        return res;
+        return mapped.entrySet().stream()
+                .map(t -> new MappedFactory(t.getKey(), t.getValue()))
+                .sorted((mf1, mf2) -> {
+                    String r1 = reportable(mf1.fac);
+                    String r2 = reportable(mf2.fac);
+                    int cmp = r1.toLowerCase(Locale.ROOT).compareTo(
+                            r2.toLowerCase(Locale.ROOT));
+                    if (cmp != 0) {
+                        return cmp;
+                    }
+                    return mf1.key.toLowerCase(Locale.ROOT).compareTo(
+                            mf2.key.toLowerCase(Locale.ROOT));
+                })
+                .collect(Collectors.toList());
     }
 
     private static class MappedFactory {

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/ExpandTabsReader.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2018, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis;
@@ -115,15 +115,12 @@ public static int translate(String line, int column, int tabSize) {
         int newColumn = 0;
         for (int i = 0; i < column; ++i) {
             char c = line.charAt(i);
-            switch (c) {
-                case '\t':
-                    // Fill up with spaces up to the next tab stop
-                    newColumn += tabSize - (newColumn % tabSize);
-                    break;
-                default:
-                    // \r or \n are not expected so do not handle specially.
-                    ++newColumn;
-                    break;
+            if (c == '\t') {
+                // Fill up with spaces up to the next tab stop
+                newColumn += tabSize - (newColumn % tabSize);
+            } else {
+                // \r or \n are not expected so do not handle specially.
+                ++newColumn;
             }
         }
 

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/FileAnalyzerFactory.java

@@ -18,14 +18,13 @@
  */
 
 /*
- * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2017, 2018, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
@@ -82,7 +81,7 @@ private static <T> List<T> asList(T[] a) {
         if (a == null) {
             return Collections.emptyList();
         }
-        return Collections.unmodifiableList(Arrays.asList(a));
+        return List.of(a);
     }
 
     @Override

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/JFlexXrefUtils.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2011, Jens Elkner.
  * Portions Copyright (c) 2017, 2020, Chris Fraire <[email protected]>.
  */
@@ -144,8 +144,7 @@ public static String disjointSpan(Writer out, String className,
      * @return generated span id
      */
     public static String generateId(Scope scope) {
-        String name = Integer.toString(scope.getLineFrom()) + scope.getName()
-                + scope.getSignature();
+        String name = scope.getLineFrom() + scope.getName() + scope.getSignature();
         int hash = name.hashCode();
         return "scope_id_" + Integer.toHexString(hash);
     }
@@ -344,27 +343,16 @@ public static void writeSymbolTable(Writer out, Definitions defs)
         }
 
         // We want the symbol table to be sorted
-        Comparator<Tag> cmp = (Tag tag1, Tag tag2) -> {
-            // Order by symbol name, and then by line number if multiple
-            // definitions use the same symbol name
-            int ret = tag1.symbol.compareTo(tag2.symbol);
-            if (ret == 0) {
-                ret = tag1.line - tag2.line;
-            }
-            return ret;
-        };
+        // Order by symbol name, and then by line number if multiple
+        // definitions use the same symbol name
+        Comparator<Tag> cmp = Comparator.comparing((Tag tag) -> tag.symbol).thenComparingInt(tag -> tag.line);
 
-        Map<String, SortedSet<Tag>> symbols
-                = new HashMap<>();
+        Map<String, SortedSet<Tag>> symbols = new HashMap<>();
 
         for (Tag tag : defs.getTags()) {
             XrefStyle style = XrefStyle.getStyle(tag.type);
             if (style != null && style.title != null) {
-                SortedSet<Tag> tags = symbols.get(style.name);
-                if (tags == null) {
-                    tags = new TreeSet<>(cmp);
-                    symbols.put(style.name, tags);
-                }
+                SortedSet<Tag> tags = symbols.computeIfAbsent(style.name, k -> new TreeSet<>(cmp));
                 tags.add(tag);
             }
         }

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/PathTokenizer.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2018, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis;
@@ -132,8 +132,4 @@ public void reset() throws IOException {
         startPosition = 0;
     }
 
-    @Override
-    public final void close() throws IOException {
-        super.close();
-    }
 }

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/Scopes.java

@@ -18,7 +18,7 @@
  */
 
  /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
  */
 package org.opengrok.indexer.analysis;
 
@@ -73,7 +73,7 @@ public boolean matches(int line) {
 
         @Override
         public int compareTo(Scope o) {
-            return lineFrom < o.lineFrom ? -1 : lineFrom > o.lineFrom ? 1 : 0;
+            return Integer.compare(lineFrom, o.lineFrom);
         }
 
         public int getLineFrom() {
@@ -121,7 +121,7 @@ public void setSignature(String signature) {
     public static final Scope GLOBAL_SCOPE = new Scope(0, 0, "global", null, null);
 
     // tree of scopes sorted by starting line
-    private TreeSet<Scope> scopes = new TreeSet<>();
+    private final TreeSet<Scope> scopes = new TreeSet<>();
 
     public Scopes() {
         // nothing to do here

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/document/MandocRunner.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2017, 2018, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis.document;
@@ -70,7 +70,7 @@ public void setOSOverride( String value ) {
     }
 
     /**
-     * Starts a run of the mandoc binary to receive input from {@link write}.
+     * Starts a run of the mandoc binary to receive input from {@link #write}.
      * @throws IOException thrown if a read or write to the mandoc process
      * fails.
      * @throws MandocException if no mandoc binary is defined
@@ -102,9 +102,7 @@ public void start() throws IOException, MandocException {
 
         if (LOGGER.isLoggable(Level.FINER)) {
             StringBuilder sb = new StringBuilder();
-            command.forEach((s) -> {
-                sb.append(s).append(" ");
-            });
+            command.forEach(s -> sb.append(s).append(" "));
             String cmd = sb.toString();
             LOGGER.log(Level.FINER, "Executing mandoc command [{0}]", cmd);
         }
@@ -175,7 +173,7 @@ public String finish() throws IOException, MandocException {
      * Writes a character to the input of the run of mandoc.
      * @param s the string to write.
      * @throws IllegalStateException thrown if the runner was not successfully
-     * {@link start}ed.
+     * {@link #start}ed.
      * @throws IOException thrown if a write to the mandoc process fails.
      */
     public void write(String s) throws IOException {

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/executables/ELFAnalyzer.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2018, 2020, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis.executables;
@@ -166,10 +166,7 @@ public String parseELF(FileChannel fch) throws IOException {
     }
 
     private boolean isReadable(int c) {
-        if (c > ' ' && c <= 127) {
-            return true;
-        }
-        return false;
+        return c > ' ' && c <= 127;
     }
 
     private String getName(int tab, int stroff, MappedByteBuffer fmap) {

opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/plain/PlainAnalyzerFactory.java

@@ -18,13 +18,15 @@
  */
 
 /*
- * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2017, 2018, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.analysis.plain;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
 import org.opengrok.indexer.analysis.AbstractAnalyzer;
 import org.opengrok.indexer.analysis.AnalyzerFactory;
 import org.opengrok.indexer.analysis.FileAnalyzerFactory;
@@ -66,7 +68,7 @@ private boolean isPlainText(byte[] content) throws IOException {
                 if (lengthBOM > 0) {
                     return true;
                 }
-                String ascii = new String(content, "US-ASCII");
+                String ascii = new String(content, StandardCharsets.US_ASCII);
                 return isPlainText(ascii);
             }