Examples of java.nio.MappedByteBuffer.limit()

java.nio.MappedByteBuffer.limit()

            MappedByteBuffer mapped = readOnlyFileChannel.map(MapMode.READ_ONLY,
                    sizes[i], CONTENT_LEN);
            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (capacity)", CONTENT_LEN, mapped.capacity());
            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (limit)", CONTENT_LEN, mapped.limit());
            assertEquals("Incorrectly mapped file channel for " + sizes[i]
                    + " position (position)", 0, mapped.position());


            // map not change channel's position
            assertEquals(0, readOnlyFileChannel.position());

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        }
        
        FileChannel f = getChannel(pageNumber);
        int offsetInFile = (int) ((Math.abs(pageNumber) % PAGES_PER_FILE)* PAGE_SIZE);
        MappedByteBuffer b = buffers.get(f);
        if( b.limit()<=offsetInFile){


            //remapping buffer for each newly added page would be slow,
            //so allocate new size in chunks
            int increment = Math.min(PAGE_SIZE * 1024,offsetInFile/10);
            increment  -= increment% PAGE_SIZE;

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        if(b == null){ //not mapped yet
            b = f.map(FileChannel.MapMode.READ_WRITE, 0, f.size());
        }
        
        //check buffers size
        if(b.limit()<=offsetInFile){
                //file is smaller, return empty data
                return ByteBuffer.wrap(PageFile.CLEAN_DATA).asReadOnlyBuffer();
            }


        b.position(offsetInFile);

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        {
            segBuffer = segments.get(seg);
        }
        
        segBuffer.position(segOff);
        segBuffer.limit(segOff + blockSize);
        
        ByteBuffer toReturn = segBuffer.slice();
        
        segBuffer.limit(segBuffer.capacity());

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        segBuffer.position(segOff);
        segBuffer.limit(segOff + blockSize);
        
        ByteBuffer toReturn = segBuffer.slice();
        
        segBuffer.limit(segBuffer.capacity());
        
        return toReturn;
    }
    
    @Override

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        assertEquals(0, readWriteFileChannel.size());
        MappedByteBuffer mapped = readWriteFileChannel.map(MapMode.READ_ONLY,
                0, CONTENT_LENGTH);
        assertEquals(CONTENT_LENGTH, readWriteFileChannel.size());
        readOnlyFileChannel.close();
        assertEquals(CONTENT_LENGTH, mapped.limit());
    }


    /**
     * @tests java.nio.channels.FileChannel#map(MapMode,long,long)
     */

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    public void test_map_Private_CloseChannel() throws IOException {
        MappedByteBuffer mapped = readWriteFileChannel.map(MapMode.PRIVATE, 0,
                CONTENT_LENGTH);
        readWriteFileChannel.close();
        mapped.put(TEST_BYTES);
        assertEquals(CONTENT_LENGTH, mapped.limit());
        assertEquals("test".length(), mapped.position());
    }


    /**
     * @tests java.nio.channels.FileChannel#map(MapMode,long,long)

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            mapped.put(TEST_BYTES);
            fail("should throw ReadOnlyBufferException.");
        } catch (ReadOnlyBufferException ex) {
            // expected;
        }
        assertEquals(CONTENT_LENGTH, mapped.limit());
        assertEquals(CONTENT_LENGTH, mapped.capacity());
        assertEquals(0, mapped.position());


        // try to get a readonly map from read/write channel
        writeDataToFile(fileOfReadWriteFileChannel);

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        // try to get a readonly map from read/write channel
        writeDataToFile(fileOfReadWriteFileChannel);
        mapped = readWriteFileChannel.map(MapMode.READ_ONLY, 0, CONTENT
                .length());
        assertEquals(CONTENT_LENGTH, mapped.limit());
        assertEquals(CONTENT_LENGTH, mapped.capacity());
        assertEquals(0, mapped.position());


        // map not change channel's position
        assertEquals(0, readOnlyFileChannel.position());

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     */
    public void test_map_ReadOnly_NonZeroPosition() throws IOException {
        this.writeDataToFile(fileOfReadOnlyFileChannel);
        MappedByteBuffer mapped = readOnlyFileChannel.map(MapMode.READ_ONLY,
                10, CONTENT_LENGTH - 10);
        assertEquals(CONTENT_LENGTH - 10, mapped.limit());
        assertEquals(CONTENT_LENGTH - 10, mapped.capacity());
        assertEquals(0, mapped.position());
    }


    /**

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