src/java.base/share/classes/jdk/internal/jimage/ImageStrings.java

*** 23,107 ****
   * questions.
   */
  
  package jdk.internal.jimage;
  
! import java.nio.ByteBuffer;
! import java.util.HashMap;
  
! class ImageStrings {
!     private static final int NOT_FOUND = -1;
!     static final int EMPTY_OFFSET = 0;
! 
!     private final HashMap<UTF8String, Integer> stringToOffsetMap;
!     private final ImageStream stream;
! 
!     ImageStrings() {
!         this.stringToOffsetMap = new HashMap<>();
!         this.stream = new ImageStream();
! 
!         // Reserve 0 offset for empty string.
!         int offset = addString(UTF8String.EMPTY_STRING);
!         assert offset == 0 : "Empty string not zero offset";
!         // Reserve 1 offset for frequently used ".class".
!         addString(UTF8String.CLASS_STRING);
!     }
! 
!     ImageStrings(ImageStream stream) {
!         this.stringToOffsetMap = new HashMap<>();
!         this.stream = stream;
!     }
! 
!     private int addString(final UTF8String string) {
!         int offset = stream.getPosition();
!         string.writeTo(stream);
!         stream.put('\0');
!         stringToOffsetMap.put(string, offset);
! 
!         return offset;
!     }
! 
!     int add(final UTF8String string) {
!         int offset = find(string);
! 
!         return offset == NOT_FOUND ? addString(string) : offset;
!     }
! 
!     int find(final UTF8String string) {
!         Integer offset = stringToOffsetMap.get(string);
! 
!         return offset != null ? offset : NOT_FOUND;
!     }
! 
!     UTF8String get(int offset) {
!         ByteBuffer buffer = stream.getBuffer();
!         assert 0 <= offset && offset < buffer.capacity() : "String buffer offset out of range";
!         int zero = NOT_FOUND;
!         for (int i = offset; i < buffer.capacity(); i++) {
!             if (buffer.get(i) == '\0') {
!                 zero = i;
!                 break;
!             }
!         }
!         assert zero != UTF8String.NOT_FOUND;
!         int length = zero - offset;
!         byte[] bytes = new byte[length];
!         int mark = buffer.position();
!         buffer.position(offset);
!         buffer.get(bytes);
!         buffer.position(mark);
! 
!         return new UTF8String(bytes, 0, length);
!     }
! 
!     ImageStream getStream() {
!         return stream;
!     }
! 
!     int getSize() {
!         return stream.getSize();
!     }
! 
!     int getCount() {
!         return stringToOffsetMap.size();
!     }
  }
--- 23,32 ----
   * questions.
   */
  
  package jdk.internal.jimage;
  
! interface ImageStrings {
!     public UTF8String get(int offset);
  
!     public int add(final UTF8String string);
  }