Renames InputStreamInterceptor methods to avoid referring to 'headers'.

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

@@ -215,12 +215,12 @@ static IonReader buildReader(
     ) {
         List<InputStreamInterceptor> streamInterceptors = builder.getInputStreamInterceptors();
         for (InputStreamInterceptor streamInterceptor : streamInterceptors) {
-            int headerLength = streamInterceptor.headerMatchLength();
+            int headerLength = streamInterceptor.numberOfBytesNeededToDetermineMatch();
             validateHeaderLength(headerLength);
             if (length < headerLength) {
                 continue;
             }
-            if (streamInterceptor.matchesHeader(ionData, offset, length)) {
+            if (streamInterceptor.isMatch(ionData, offset, length)) {
                 try {
                     return buildReader(
                         builder,
@@ -329,7 +329,7 @@ static IonReader buildReader(
         }
         int maxHeaderLength = Math.max(
             _Private_IonConstants.BINARY_VERSION_MARKER_SIZE,
-            inputStreamInterceptors.stream().mapToInt(InputStreamInterceptor::headerMatchLength).max().orElse(0)
+            inputStreamInterceptors.stream().mapToInt(InputStreamInterceptor::numberOfBytesNeededToDetermineMatch).max().orElse(0)
         );
         validateHeaderLength(maxHeaderLength);
         // Note: this can create a lot of layers of InputStream wrappers. For example, if this method is called
@@ -349,10 +349,10 @@ static IonReader buildReader(
         // or it's a binary stream (in which case the correct reader was created) or it's a growing text stream
         // (which has always been unsupported).
         for (InputStreamInterceptor streamInterceptor : inputStreamInterceptors) {
-            if (bytesRead < streamInterceptor.headerMatchLength()) {
+            if (bytesRead < streamInterceptor.numberOfBytesNeededToDetermineMatch()) {
                 continue;
             }
-            if (streamInterceptor.matchesHeader(possibleIVM, 0, bytesRead)) {
+            if (streamInterceptor.isMatch(possibleIVM, 0, bytesRead)) {
                 try {
                     ionData = streamInterceptor.newInputStream(
                         new TwoElementInputStream(new ByteArrayInputStream(possibleIVM, 0, bytesRead), ionData)

src/main/java/com/amazon/ion/util/GzipStreamInterceptor.java

@@ -21,12 +21,12 @@ public String formatName() {
     }
 
     @Override
-    public int headerMatchLength() {
+    public int numberOfBytesNeededToDetermineMatch() {
         return GZIP_HEADER.length;
     }
 
     @Override
-    public boolean matchesHeader(byte[] candidate, int offset, int length) {
+    public boolean isMatch(byte[] candidate, int offset, int length) {
         if (candidate == null || length < GZIP_HEADER.length) {
             return false;
         }

src/main/java/com/amazon/ion/util/InputStreamInterceptor.java

@@ -10,8 +10,8 @@
 
 /**
  * An interceptor to be consulted by the {@link com.amazon.ion.system.IonReaderBuilder} when creating an
- * {@link IonReader} over a user-provided stream. This allows users to configure a sequence of interceptors
- * to allow transformation of the stream's raw bytes into valid text or binary Ion.
+ * {@link IonReader} over a user-provided stream. This allows users to transform a stream's raw bytes into
+ * valid text or binary Ion.
  *
  * @see com.amazon.ion.system.IonReaderBuilder#addInputStreamInterceptor(InputStreamInterceptor)
  * @see com.amazon.ion.system.IonSystemBuilder#withReaderBuilder(IonReaderBuilder)
@@ -26,22 +26,22 @@ public interface InputStreamInterceptor {
 
     /**
      * The number of bytes required to be read from the beginning of the stream in order to determine whether
-     * it matches this format. If a stream contains fewer than the number of bytes returned by this method, then
-     * {@link #matchesHeader(byte[], int, int)} will never be called and this interceptor will not be considered
-     * a match.
+     * it matches the format relevant to this interceptor. If a stream contains fewer than the number of bytes
+     * returned by this method, then this interceptor will not be considered a match and
+     * {@link #isMatch(byte[], int, int)} will not be called.
      * @return the length in bytes.
      */
-    int headerMatchLength();
+    int numberOfBytesNeededToDetermineMatch();
 
     /**
      * Determines whether the given candidate byte sequence matches this format.
      * @param candidate the candidate byte sequence.
      * @param offset the offset into the candidate bytes to begin matching.
      * @param length the number of bytes (beginning at 'offset') in `candidate`. Must be greater than or equal to
-     *               {@link #headerMatchLength()}.
+     *               {@link #numberOfBytesNeededToDetermineMatch()}.
      * @return true if the candidate byte sequence matches; otherwise, false.
      */
-    boolean matchesHeader(byte[] candidate, int offset, int length);
+    boolean isMatch(byte[] candidate, int offset, int length);
 
     /**
      * Creates a new InputStream that transforms the bytes in the given InputStream into valid text or binary Ion.

src/test/java/com/amazon/ion/util/ZstdStreamInterceptorTest.java

@@ -59,12 +59,12 @@ public String formatName() {
         }
 
         @Override
-        public int headerMatchLength() {
+        public int numberOfBytesNeededToDetermineMatch() {
             return ZSTD_HEADER.length;
         }
 
         @Override
-        public boolean matchesHeader(byte[] candidate, int offset, int length) {
+        public boolean isMatch(byte[] candidate, int offset, int length) {
             if (candidate == null || length < ZSTD_HEADER.length) {
                 return false;
             }
@@ -362,12 +362,12 @@ public String formatName() {
         }
 
         @Override
-        public int headerMatchLength() {
+        public int numberOfBytesNeededToDetermineMatch() {
             return length;
         }
 
         @Override
-        public boolean matchesHeader(byte[] candidate, int offset, int length) {
+        public boolean isMatch(byte[] candidate, int offset, int length) {
             return Assertions.fail("This method should be unreachable.");
         }