initial code removal (limited number of apparently unused code)

src/main/java/com/amazon/ion/impl/IonReaderTextRawTokensX.java

@@ -1,18 +1,5 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file 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.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl;
 
 import static com.amazon.ion.impl.IonTokenConstsX.CharacterSequence.CHAR_SEQ_ESCAPED_NEWLINE_SEQUENCE_1;
@@ -1582,11 +1569,11 @@ protected IonType load_number(StringBuilder sb) throws IOException
             int c2 = read_char();
             if (Radix.HEX.isPrefix(c2)) {
                 sb.append((char)c);
-                c = loadRadixValue(sb, has_sign, c2, Radix.HEX);
+                c = loadRadixValue(sb, c2, Radix.HEX);
                 return load_finish_number(sb, c, IonTokenConstsX.TOKEN_HEX);
             } else if (Radix.BINARY.isPrefix(c2)) {
                 sb.append((char) c);
-                c = loadRadixValue(sb, has_sign, c2, Radix.BINARY);
+                c = loadRadixValue(sb, c2, Radix.BINARY);
                 return load_finish_number(sb, c, IonTokenConstsX.TOKEN_BINARY);
             }
             // not a next value, back up and try again
@@ -1843,7 +1830,7 @@ else if (c == '+' || c == '-') {
         return load_finish_number(sb, c, IonTokenConstsX.TOKEN_TIMESTAMP);
     }
 
-    private final int loadRadixValue(StringBuilder sb, boolean has_sign, int c2, Radix radix)
+    private final int loadRadixValue(StringBuilder sb, int c2, Radix radix)
         throws IOException
     {
         radix.assertPrefix(c2);

src/main/java/com/amazon/ion/impl/UnifiedInputStreamX.java

@@ -1,21 +1,7 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file 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.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl;
 
-import com.amazon.ion.impl.IonReaderTextRawTokensX.IonReaderTextTokenException;
 import com.amazon.ion.impl.UnifiedSavePointManagerX.SavePoint;
 import java.io.Closeable;
 import java.io.IOException;
@@ -383,19 +369,6 @@ public final int read(byte[] dst, int offset, int length) throws IOException
         }
         return length - remaining;
     }
-    private int read_utf8(int c) throws IOException
-    {
-        int len = IonUTF8.getUTF8LengthFromFirstByte(c);
-        for (int ii=1; ii<len; ii++) {
-            int c2 = read();
-            if (c2 == -1) {
-                throw new IonReaderTextTokenException("invalid UTF8 sequence encountered in stream");
-            }
-            c |= (c2 << (ii*8));
-        }
-        c = IonUTF8.getScalarFrom4BytesReversed(c);
-        return c;
-    }
 
     /**
      * the refill method is the key override that is filled in by