8261880: Change nested classes in java.base to static nested classes where possible

Reviewed-by: redestad

Author: stsypanov

src/java.base/macosx/classes/apple/security/KeychainStore.java

@@ -53,7 +53,7 @@ public final class KeychainStore extends KeyStoreSpi {
     // If a key came from the keychain it has a SecKeyRef and one or more
     // SecCertificateRef.  When we delete the key we have to delete all of the corresponding
     // native objects.
-    class KeyEntry {
+    static class KeyEntry {
         Date date; // the creation date of this entry
         byte[] protectedPrivKey;
         char[] password;
@@ -63,7 +63,7 @@ class KeyEntry {
     };
 
     // Trusted certificates
-    class TrustedCertEntry {
+    static class TrustedCertEntry {
         Date date; // the creation date of this entry
 
         Certificate cert;
@@ -883,7 +883,7 @@ private void createKeyEntry(String alias, long creationDate, long secKeyRef,
         entries.put(alias.toLowerCase(), ke);
     }
 
-    private class CertKeychainItemPair {
+    private static class CertKeychainItemPair {
         long mCertificateRef;
         Certificate mCert;
 

src/java.base/share/classes/java/lang/StackStreamFactory.java

@@ -620,7 +620,7 @@ static final class CallerClassFinder extends AbstractStackWalker<Integer, Class<
             super(walker, FILL_CLASS_REFS_ONLY|GET_CALLER_CLASS);
         }
 
-        final class ClassBuffer extends FrameBuffer<Class<?>> {
+        static final class ClassBuffer extends FrameBuffer<Class<?>> {
             Class<?>[] classes;      // caller class for fast path
             ClassBuffer(int batchSize) {
                 super(batchSize);

src/java.base/share/classes/java/net/Inet6Address.java

@@ -176,7 +176,7 @@
 class Inet6Address extends InetAddress {
     static final int INADDRSZ = 16;
 
-    private class Inet6AddressHolder {
+    private static class Inet6AddressHolder {
 
         private Inet6AddressHolder() {
             ipaddress = new byte[INADDRSZ];

src/java.base/share/classes/java/security/ProtectionDomain.java

@@ -566,6 +566,6 @@ public PermissionCollection run() {
     /**
      * Used for storing ProtectionDomains as keys in a Map.
      */
-    final class Key {}
+    static final class Key {}
 
 }

src/java.base/share/classes/jdk/internal/module/ServicesCatalog.java

@@ -48,7 +48,7 @@ public final class ServicesCatalog {
     /**
      * Represents a service provider in the services catalog.
      */
-    public final class ServiceProvider {
+    public static final class ServiceProvider {
         private final Module module;
         private final String providerName;
 

src/java.base/share/classes/jdk/internal/util/xml/impl/XMLStreamWriterImpl.java

@@ -578,7 +578,7 @@ private Charset checkCharset(Charset charset) throws UnsupportedEncodingExceptio
      * Start of Internal classes.
      *
      */
-    protected class Element {
+    protected static class Element {
 
         /**
          * the parent element

src/java.base/share/classes/sun/net/ftp/impl/FtpClient.java

@@ -289,7 +289,7 @@ public FtpDirEntry parseLine(String line) {
         }
     }
 
-    private class MLSxParser implements FtpDirParser {
+    private static class MLSxParser implements FtpDirParser {
         public FtpDirEntry parseLine(String line) {
             String name = null;
             int i = line.lastIndexOf(';');
@@ -1762,7 +1762,7 @@ public sun.net.ftp.FtpClient setDirParser(FtpDirParser p) {
         return this;
     }
 
-    private class FtpFileIterator implements Iterator<FtpDirEntry>, Closeable {
+    private static class FtpFileIterator implements Iterator<FtpDirEntry>, Closeable {
 
         private BufferedReader in = null;
         private FtpDirEntry nextFile = null;

src/java.base/share/classes/sun/net/www/protocol/ftp/FtpURLConnection.java

@@ -121,7 +121,7 @@ public class FtpURLConnection extends URLConnection {
      *   - The command socket (FtpClient).
      * Since that's the only class that needs to see that, it is an inner class.
      */
-    protected class FtpInputStream extends FilterInputStream {
+    protected static class FtpInputStream extends FilterInputStream {
         FtpClient ftp;
         FtpInputStream(FtpClient cl, InputStream fd) {
             super(new BufferedInputStream(fd));
@@ -144,7 +144,7 @@ public void close() throws IOException {
      *   - The command socket (FtpClient).
      * Since that's the only class that needs to see that, it is an inner class.
      */
-    protected class FtpOutputStream extends FilterOutputStream {
+    protected static class FtpOutputStream extends FilterOutputStream {
         FtpClient ftp;
         FtpOutputStream(FtpClient cl, OutputStream fd) {
             super(fd);

src/java.base/share/classes/sun/security/provider/DomainKeyStore.java

@@ -884,7 +884,7 @@ private List<KeyStoreBuilderComponents> getBuilders(URI configuration,
 /*
  * Utility class that holds the components used to construct a KeyStore.Builder
  */
-class KeyStoreBuilderComponents {
+static class KeyStoreBuilderComponents {
     String name;
     String type;
     Provider provider;

src/java.base/share/classes/sun/security/util/math/intpoly/IntegerPolynomial.java

@@ -777,7 +777,7 @@ public ImmutableElement fixed() {
 
     }
 
-    class Limb implements SmallValue {
+    static class Limb implements SmallValue {
         int value;
 
         Limb(int value) {

src/java.base/windows/classes/sun/net/www/protocol/http/ntlm/NTLMAuthSequence.java

@@ -50,7 +50,7 @@ public class NTLMAuthSequence {
     // Used by native code to indicate when a particular protocol sequence is completed
     // and must not be re-used.
 
-    class Status {
+    static class Status {
         boolean sequenceComplete;
     }