src/java.base/share/classes/java/nio/MappedByteBuffer.java

*** 1,7 ****
  /*
!  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 88,101 ****
      MappedByteBuffer(int mark, int pos, int lim, int cap) { // package-private
          super(mark, pos, lim, cap);
          this.fd = null;
      }
  
!     private void checkMapped() {
!         if (fd == null)
!             // Can only happen if a luser explicitly casts a direct byte buffer
!             throw new UnsupportedOperationException();
      }
  
      // Returns the distance (in bytes) of the buffer from the page aligned address
      // of the mapping. Computed each time to avoid storing in every direct buffer.
      private long mappingOffset() {
--- 88,99 ----
      MappedByteBuffer(int mark, int pos, int lim, int cap) { // package-private
          super(mark, pos, lim, cap);
          this.fd = null;
      }
  
!     private boolean hasMappedFile() {
!         return fd != null;
      }
  
      // Returns the distance (in bytes) of the buffer from the page aligned address
      // of the mapping. Computed each time to avoid storing in every direct buffer.
      private long mappingOffset() {
*** 129,139 ****
       *
       * @return  {@code true} if it is likely that this buffer's content
       *          is resident in physical memory
       */
      public final boolean isLoaded() {
!         checkMapped();
          if ((address == 0) || (capacity() == 0))
              return true;
          long offset = mappingOffset();
          long length = mappingLength(offset);
          return isLoaded0(mappingAddress(offset), length, Bits.pageCount(length));
--- 127,139 ----
       *
       * @return  {@code true} if it is likely that this buffer's content
       *          is resident in physical memory
       */
      public final boolean isLoaded() {
!         if (!hasMappedFile()) {
!             return true;
!         }
          if ((address == 0) || (capacity() == 0))
              return true;
          long offset = mappingOffset();
          long length = mappingLength(offset);
          return isLoaded0(mappingAddress(offset), length, Bits.pageCount(length));
*** 151,161 ****
       * occur. </p>
       *
       * @return  This buffer
       */
      public final MappedByteBuffer load() {
!         checkMapped();
          if ((address == 0) || (capacity() == 0))
              return this;
          long offset = mappingOffset();
          long length = mappingLength(offset);
          load0(mappingAddress(offset), length);
--- 151,163 ----
       * occur. </p>
       *
       * @return  This buffer
       */
      public final MappedByteBuffer load() {
!         if (!hasMappedFile()) {
!             return this;
!         }
          if ((address == 0) || (capacity() == 0))
              return this;
          long offset = mappingOffset();
          long length = mappingLength(offset);
          load0(mappingAddress(offset), length);
*** 195,205 ****
       * method has no effect. </p>
       *
       * @return  This buffer
       */
      public final MappedByteBuffer force() {
!         checkMapped();
          if ((address != 0) && (capacity() != 0)) {
              long offset = mappingOffset();
              force0(fd, mappingAddress(offset), mappingLength(offset));
          }
          return this;
--- 197,209 ----
       * method has no effect. </p>
       *
       * @return  This buffer
       */
      public final MappedByteBuffer force() {
!         if (!hasMappedFile()) {
!             return this;
!         }
          if ((address != 0) && (capacity() != 0)) {
              long offset = mappingOffset();
              force0(fd, mappingAddress(offset), mappingLength(offset));
          }
          return this;