gvsig-raster / org.gvsig.raster / branches / org.gvsig.raster.2.4 / org.gvsig.raster / org.gvsig.raster.lib / org.gvsig.raster.lib.buffer / org.gvsig.raster.lib.buffer.impl / src / main / java / org / gvsig / raster / lib / buffer / impl / AbstractPaginatedBand.java @ 6069
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package org.gvsig.raster.lib.buffer.impl; |
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import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import org.gvsig.raster.lib.buffer.api.Band; |
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import org.gvsig.raster.lib.buffer.api.BandNotification; |
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import org.gvsig.raster.lib.buffer.api.BandPageManager; |
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import org.gvsig.raster.lib.buffer.api.BufferLocator; |
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import org.gvsig.raster.lib.buffer.api.NoData; |
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import org.gvsig.raster.lib.buffer.impl.exceptions.CopyFromBandException; |
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/**
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* @author fdiaz
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*
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*/
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public abstract class AbstractPaginatedBand extends AbstractBand { |
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protected ByteBuffer data; |
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protected int firstRowOfPage; |
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protected int rowsPerPage; |
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protected BandPageManager pageManager;
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protected static final int MAX_PREFERED_SIZE = 10485760; // 10MB; |
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/**
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* @param rows
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* @param columns
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* @param noData
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* @param rowsPerPage
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* @param pageManager
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*/
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public AbstractPaginatedBand(int rows, int columns, NoData noData, BandPageManager pageManager) { |
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this.rows = rows;
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this.columns = columns;
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calculateRowsPerPage(); |
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data = ByteBuffer.allocate(rowsPerPage * columns * getDataSize());
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if (noData == null) { |
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this.noData = BufferLocator.getBufferManager().createNoData(null, null); |
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} else {
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this.noData = noData;
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} |
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this.pageManager = pageManager;
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} |
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private void calculateRowsPerPage(){ |
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rowsPerPage = MAX_PREFERED_SIZE/(this.columns*getDataSize());
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if(rowsPerPage<1){ |
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rowsPerPage = 1;
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} |
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} |
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/**
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* @param value
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* @return
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*/
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protected Object nullValueToNoData(Object value) { |
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if (value == null) { |
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if (getNoData().isDefined()) {
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value = getNoData().getValue(); |
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} else {
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// Do nothing, no data value is undefined
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return null; |
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} |
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} |
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return value;
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} |
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@Override
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public void copyFrom(Band source) throws CopyFromBandException { |
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doCopyFrom(source); |
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notifyObservers(new DefaultBandNotification(BandNotification.COPY_FROM, new Object[]{source})); |
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} |
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protected void doCopyFrom(Band source) throws CopyFromBandException { |
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if (this.getColumns() != source.getColumns() || this.getRows() != source.getRows() |
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|| this.getDataType()!=source.getDataType() ) {
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throw new CopyFromBandException(source, this); |
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} |
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Object rowBuffer = this.createRowBuffer(); |
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for(int row = 0; row<=this.rows; row++){ |
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source.fetchRow(row, rowBuffer); |
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this.putRow(row, rowBuffer);
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} |
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} |
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protected void loadPage(int row) { |
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if(!(row>=firstRowOfPage && row<firstRowOfPage+rowsPerPage)){
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return;
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} |
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saveCurrentPage(); |
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firstRowOfPage = row / rowsPerPage; //Divisi?n entera
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try {
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int rowsInPage = rowsPerPage;
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if(firstRowOfPage + rowsPerPage > this.rows){ |
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rowsInPage = this.rows - firstRowOfPage;
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} |
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this.pageManager.load(data, firstRowOfPage, rowsInPage, this.getDataType()); |
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} catch (IOException e) { |
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throw new RuntimeException("Can't save current page", e); |
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} |
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} |
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protected void saveCurrentPage() { |
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try {
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int rowsInPage = rowsPerPage;
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if(firstRowOfPage + rowsPerPage > this.rows){ |
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rowsInPage = this.rows - firstRowOfPage;
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} |
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this.pageManager.save(data, firstRowOfPage, rowsInPage, this.getDataType()); |
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} catch (UnsupportedOperationException e) { |
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// Do nothing, operation not supported
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} catch (IOException e) { |
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throw new RuntimeException("Can't save current page", e); |
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} |
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} |
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protected abstract int getDataSize(); |
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@Override
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public boolean isReadOnly() { |
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if(this.pageManager==null){ |
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return false; |
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} |
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return !this.pageManager.isSupportedSave(); |
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} |
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@Override
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public boolean isPaginated() { |
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return true; |
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} |
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} |