Move the TlvReaderExternsion to TlvReader (project-chip#30117)

src/controller/java/BUILD.gn

@@ -328,9 +328,7 @@ kotlin_library("chipcluster") {
 
   deps = [ ":tlv" ]
 
-  sources = [ "src/chip/devicecontroller/cluster/TlvReaderExtension.kt" ]
-
-  sources += structs_sources
+  sources = structs_sources
   sources += eventstructs_sources
 
   kotlinc_flags = [ "-Xlint:deprecation" ]

src/controller/java/src/matter/tlv/TlvReader.kt

@@ -265,6 +265,57 @@ class TlvReader(bytes: ByteArray) : Iterable<Element> {
     require(value is NullValue) { "Unexpected value $value at index $index (expected NullValue)" }
   }
 
+  /**
+   * Retrieves a Boolean value associated with the given tag.
+   *
+   * @param tag The Tag to query for.
+   * @return The Boolean value associated with the tag.
+   */
+  fun getBoolean(tag: Tag): Boolean {
+    return getBool(tag)
+  }
+
+  /**
+   * Retrieves a String value associated with the given tag. The returned string is in UTF-8 format.
+   *
+   * @param tag The Tag to query for.
+   * @return The String value associated with the tag.
+   */
+  fun getString(tag: Tag): String {
+    return getUtf8String(tag)
+  }
+
+  /**
+   * Retrieves a ByteArray value associated with the given tag.
+   *
+   * @param tag The Tag to query for.
+   * @return The ByteArray value associated with the tag.
+   */
+  fun getByteArray(tag: Tag): ByteArray {
+    return getByteString(tag)
+  }
+
+  /**
+   * Checks if the current element's value is of type NullValue.
+   *
+   * @return True if the current element's value is NullValue, otherwise false.
+   */
+  fun isNull(): Boolean {
+    val value = peekElement().value
+    return (value is NullValue)
+  }
+
+  /**
+   * Checks if the next tag in sequence matches the provided tag.
+   *
+   * @param tag The Tag to compare against the next tag.
+   * @return True if the next tag matches the provided tag, otherwise false.
+   */
+  fun isNextTag(tag: Tag): Boolean {
+    val nextTag = peekElement().tag
+    return (nextTag == tag)
+  }
+
   /**
    * Verifies that the current element is a start of a Structure and advances to the next element.
    *