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 @ 8788
History | View | Annotate | Download (5.62 KB)
1 |
package org.gvsig.raster.lib.buffer.impl; |
---|---|
2 |
|
3 |
import java.io.IOException; |
4 |
import java.nio.Buffer; |
5 |
|
6 |
import org.slf4j.Logger; |
7 |
import org.slf4j.LoggerFactory; |
8 |
|
9 |
import org.gvsig.raster.lib.buffer.api.Band; |
10 |
import org.gvsig.raster.lib.buffer.api.BandInfo; |
11 |
import org.gvsig.raster.lib.buffer.api.BandNotification; |
12 |
import org.gvsig.raster.lib.buffer.api.BandPageManager; |
13 |
import org.gvsig.raster.lib.buffer.api.BufferLocator; |
14 |
import org.gvsig.raster.lib.buffer.api.BufferNotification; |
15 |
import org.gvsig.raster.lib.buffer.api.NoData; |
16 |
import org.gvsig.raster.lib.buffer.impl.exceptions.CopyFromBandException; |
17 |
import org.gvsig.tools.exception.BaseException; |
18 |
|
19 |
/**
|
20 |
* @author fdiaz
|
21 |
*
|
22 |
*/
|
23 |
public abstract class AbstractPaginatedBand extends AbstractBand implements Band { |
24 |
|
25 |
private static final Logger logger = LoggerFactory.getLogger(AbstractPaginatedBand.class); |
26 |
protected Buffer data; |
27 |
protected int firstRowOfPage; |
28 |
protected int rowsPerPage; |
29 |
protected BandPageManager pageManager;
|
30 |
private boolean loaded; |
31 |
|
32 |
protected static final int MAX_PREFERED_SIZE = 10485760; // 10MB; |
33 |
|
34 |
/**
|
35 |
* @param rows
|
36 |
* @param columns
|
37 |
* @param noData
|
38 |
* @param pageManager
|
39 |
*/
|
40 |
public AbstractPaginatedBand(int rows, int columns, NoData noData, BandPageManager pageManager) { |
41 |
this.rows = rows;
|
42 |
this.columns = columns;
|
43 |
this.loaded = false; |
44 |
calculateRowsPerPage(); |
45 |
|
46 |
if (noData == null) { |
47 |
this.noData = BufferLocator.getBufferManager().createNoData(null, null); |
48 |
} else {
|
49 |
this.noData = noData;
|
50 |
} |
51 |
this.pageManager = pageManager;
|
52 |
} |
53 |
|
54 |
private void calculateRowsPerPage() { |
55 |
rowsPerPage = MAX_PREFERED_SIZE / (this.columns * getDataSize());
|
56 |
if (rowsPerPage < 1) { |
57 |
rowsPerPage = 1;
|
58 |
} |
59 |
if (rowsPerPage > rows) {
|
60 |
rowsPerPage = rows; |
61 |
} |
62 |
|
63 |
} |
64 |
|
65 |
@Override
|
66 |
public void copyFrom(Band source) throws CopyFromBandException { |
67 |
doCopyFrom(source); |
68 |
notifyObservers(new DefaultBandNotification(BandNotification.COPY_FROM, new Object[] { source })); |
69 |
} |
70 |
|
71 |
protected void doCopyFrom(Band source) throws CopyFromBandException { |
72 |
if (this.getColumns() != source.getColumns() || this.getRows() != source.getRows() |
73 |
|| this.getDataType() != source.getDataType()) {
|
74 |
throw new CopyFromBandException(source, this); |
75 |
} |
76 |
Object rowBuffer = this.createRowBuffer(); |
77 |
for (int row = 0; row < this.rows; row++) { |
78 |
source.fetchRow(row, rowBuffer); |
79 |
this.putRow(row, rowBuffer);
|
80 |
} |
81 |
} |
82 |
|
83 |
@Override
|
84 |
protected void doCopyFrom(Band source, int row, int column) throws CopyFromBandException { |
85 |
if (this.getColumns() <= row+source.getColumns() || this.getRows() <= column+source.getRows() |
86 |
|| this.getDataType()!=source.getDataType() ) {
|
87 |
throw new CopyFromBandException(source, this); |
88 |
} |
89 |
//FIXME:
|
90 |
Object rowBuffer = source.createRowBuffer();
|
91 |
for(int r=0; r<Math.min(this.getRows()-row, source.getRows()); r++){ |
92 |
source.fetchRow(r, rowBuffer); |
93 |
System.arraycopy(rowBuffer, 0, this.data, (r+row)*this.getColumns()+column, Math.min(this.getColumns()-column, source.getColumns())); |
94 |
this.putRow(r, rowBuffer);
|
95 |
} |
96 |
} |
97 |
|
98 |
protected void loadPage(int row) { |
99 |
if (loaded && row >= firstRowOfPage && row < firstRowOfPage + rowsPerPage) {
|
100 |
return;
|
101 |
} |
102 |
loaded = false;
|
103 |
|
104 |
saveCurrentPage(); |
105 |
int currentPage = row / rowsPerPage; // Divisi?n entera |
106 |
firstRowOfPage = currentPage * rowsPerPage; |
107 |
try {
|
108 |
int rowsInPage = rowsPerPage;
|
109 |
if (firstRowOfPage + rowsPerPage > this.rows) { |
110 |
rowsInPage = this.rows - firstRowOfPage;
|
111 |
} |
112 |
this.pageManager.load(data, firstRowOfPage, rowsInPage, this.getDataType()); |
113 |
loaded = true;
|
114 |
this.notifyObservers(new DefaultBufferNotification(BandNotification.LOADED_PAGE, new Object[] { this })); |
115 |
} catch (IOException e) { |
116 |
throw new RuntimeException("Can't load current page", e); |
117 |
} |
118 |
} |
119 |
|
120 |
protected void saveCurrentPage() { |
121 |
try {
|
122 |
int rowsInPage = rowsPerPage;
|
123 |
if (firstRowOfPage + rowsPerPage > this.rows) { |
124 |
rowsInPage = this.rows - firstRowOfPage;
|
125 |
} |
126 |
this.pageManager.save(data, firstRowOfPage, rowsInPage, this.getDataType()); |
127 |
} catch (UnsupportedOperationException e) { |
128 |
// Do nothing, operation not supported
|
129 |
} catch (IOException e) { |
130 |
throw new RuntimeException("Can't save current page", e); |
131 |
} |
132 |
} |
133 |
|
134 |
protected abstract int getDataSize(); |
135 |
|
136 |
@Override
|
137 |
public boolean isReadOnly() { |
138 |
if (this.pageManager == null) { |
139 |
return false; |
140 |
} |
141 |
return !this.pageManager.isSupportedSave(); |
142 |
} |
143 |
|
144 |
@Override
|
145 |
public boolean isPaginated() { |
146 |
return true; |
147 |
} |
148 |
|
149 |
@Override
|
150 |
public BandInfo getBandInfo() {
|
151 |
return this.pageManager == null ? null : this.pageManager.getBandInfo(); |
152 |
} |
153 |
|
154 |
/**
|
155 |
* Calculate buffer size than must be allocated.
|
156 |
*
|
157 |
* @param rows
|
158 |
* @param columns
|
159 |
* @return
|
160 |
*/
|
161 |
protected int calculateBufferSizeToAllocate(int rows, int columns) { |
162 |
return rowsPerPage * columns;
|
163 |
} |
164 |
|
165 |
@Override
|
166 |
public void doDispose() throws BaseException { |
167 |
super.doDispose();
|
168 |
data = null;
|
169 |
//FIXME: ?hacer disposables los pageManagers?
|
170 |
pageManager = null;
|
171 |
} |
172 |
|
173 |
@Override
|
174 |
protected void finalize() throws Throwable { |
175 |
super.finalize();
|
176 |
} |
177 |
|
178 |
|
179 |
} |