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

@@ -23,85 +23,10 @@
  * questions.
  */
 
 package jdk.internal.jimage;
 
-import java.nio.ByteBuffer;
-import java.util.HashMap;
+interface ImageStrings {
+    public UTF8String get(int offset);
 
-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();
-    }
+    public int add(final UTF8String string);
 }