Application: gvSIG desktop » gvSIG raster

package org.gvsig.raster.cache.buffer.impl.stripecache.vertical;

import org.gvsig.raster.cache.buffer.NoData;

import org.gvsig.raster.cache.buffer.exception.InvalidPageNumberException;

import org.gvsig.raster.cache.buffer.exception.OperationNotSupportedException;

import org.gvsig.raster.cache.buffer.impl.RasterBuffer;

import org.gvsig.raster.cache.buffer.impl.stripecache.Cache;

import org.gvsig.raster.cache.buffer.impl.stripecache.CacheBand;

import org.gvsig.raster.cache.buffer.impl.stripecache.LRUAlgorithm;

/**

 * This class represent a byte band loaded in cache.

 * 

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public class ByteBand extends CacheBand {

        /**

         * Create a empty band asociated to existing cache

         * @param cache 

         * @param lru

         * @param band

         */

        public ByteBand(Cache cache, LRUAlgorithm lru, int band) {

                super(cache, lru, band);

                this.setDataType(RasterBuffer.TYPE_BYTE);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.buffer.impl.stripecache.CacheBand#getNumberOfBlocks()

         */

        @Override

        public int getNumberOfBlocks() {

                return (int)Math.ceil((double)getWidth() / (double)getBlockSize());

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.cache.buffer.Band#isHorizontalBlock()

         */

        public boolean isHorizontalBlock() {

                return false;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#assign(byte)

         */

        public void assign(byte value) {

                for(int col = 0; col < getWidth(); col ++) {

                        boolean beginCol = true;  //Para acelerar solo comprobar? si la p?gina est? en cach? cada vez que empieza una columna

                    for(int line = 0; line < getHeight(); line ++) {

                            try {

                                    if(beginCol) {

                                            lru.cacheAccess(col, false);

                                            beginCol = false;

                                    }

                            } catch (InvalidPageNumberException e) {

                                    return;

                            } catch (InterruptedException e) {

                                    return;

                            }

                            cache.getAccessPage().setElem(line, (col& cache.getOffset()), nBand, value);                

                    }

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#getByteBlock(int)

         */

        public byte[][] getByteBlock(int block) {

                int col = block * getBlockSize();

                try {

                        lru.cacheAccess(col, true);

                } catch (InvalidPageNumberException e) {

                        return null;

                } catch (InterruptedException e) {

                        return null;

                }

                return cache.getAccessPage().getBand(nBand).getByteBlock(block);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.IRasterBand#setByteBlock(byte[][], int)

         */

        public void setByteBlock(byte[][] data, int block) {

                int col = block * getBlockSize();

                try {

                        lru.cacheAccess(col, true);

                } catch (InvalidPageNumberException e) {

                        return;

                } catch (InterruptedException e) {

                        return;

                }

                try {

                        cache.getAccessPage().getBand(nBand).setByteBlock(data, block);

                } catch (OperationNotSupportedException e) {

                        //Solo buffers de solo lectura

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#getByteLine(int)

         */

        public byte[] getByteLine(int line) throws OperationNotSupportedException {

                throw new OperationNotSupportedException("Operation getByteLine not supported for a vertical band of cache");

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#getElemByte(int, int)

         */

        public byte getElemByte(int line, int col) {

                if(exists(col)) {

                        return cache.getAccessPage().getElemByte(line, (col & cache.getOffset()), nBand);

                }

                return getNoDataValue().isDefined() ? getNoDataValue().getValue().byteValue() : NoData.defaultByteNoDataValue;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#setByteLine(byte[], int)

         */

        public void setByteLine(byte[] data, int line) throws OperationNotSupportedException {

                throw new OperationNotSupportedException("Operation getByteLine not supported for a vertical band of cache");

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.buffer.RasterBand#setElem(int, int, byte)

         */

        public void setElem(int line, int col, byte data) {

                if(exists(col)) {

                        cache.getAccessPage().setElem(line, (col & cache.getOffset()), nBand, data);

                }

        }

        /*

         * (non-Javadoc)

         * @see java.lang.Object#clone()

         */

        public Object clone() {

                Cache cloneCache = (Cache)cache.clone();

                LRUAlgorithm cloneLRU = new LRUAlgorithm(cloneCache);

                return new ByteBand(cloneCache, cloneLRU, nBand);

        }

}