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java.lang.Objectorg.geotools.data.shape.dbf.DbaseFileReader
A DbaseFileReader is used to read a dbase III format file.
The general use of this class is:
For consumers who wish to be a bit more selective with their reading of rows,
the Row object has been added. The semantics are the same as using the
readEntry method, but remember that the Row object is always the same. The
values are parsed as they are read, so it pays to copy them out (as each call
to Row.read() will result in an expensive String parse).
FileChannel in = new FileInputStream("thefile.dbf").getChannel();
DbaseFileReader r = new DbaseFileReader( in )
Object[] fields = new Object[r.getHeader().getNumFields()];
while (r.hasNext()) {
r.readEntry(fields);
// do stuff
}
r.close();
EACH CALL TO readEntry OR readRow ADVANCES THE FILE!
An example of using the Row method of reading:
FileChannel in = new FileInputStream("thefile.dbf").getChannel();
DbaseFileReader r = new DbaseFileReader( in )
int fields = r.getHeader().getNumFields();
while (r.hasNext()) {
DbaseFileReader.Row row = r.readRow();
for (int i = 0; i < fields; i++) {
// do stuff
Foo.bar( row.read(i) );
}
}
r.close();
Nested Class Summary | |
class |
DbaseFileReader.Row
|
Constructor Summary | |
DbaseFileReader(java.nio.channels.ReadableByteChannel channel)
Like calling DbaseFileReader(ReadableByteChannel, true); |
|
DbaseFileReader(java.nio.channels.ReadableByteChannel channel,
boolean useMemoryMappedBuffer)
Creates a new instance of DBaseFileReader |
Method Summary | |
void |
close()
Clean up all resources associated with this reader. |
DbaseFileHeader |
getHeader()
Get the header from this file. |
void |
goTo(int recno)
|
boolean |
hasNext()
Query the reader as to whether there is another record. |
static void |
main(java.lang.String[] args)
|
java.lang.Object[] |
readEntry()
Get the next record (entry). |
java.lang.Object[] |
readEntry(java.lang.Object[] entry)
Copy the next entry into the array. |
java.lang.Object[] |
readEntry(java.lang.Object[] entry,
int offset)
Copy the next record into the array starting at offset. |
DbaseFileReader.Row |
readRow()
|
void |
skip()
Skip the next record. |
void |
transferTo(DbaseFileWriter writer)
Transfer, by bytes, the next record to the writer. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public DbaseFileReader(java.nio.channels.ReadableByteChannel channel) throws java.io.IOException
channel
-
java.io.IOException
public DbaseFileReader(java.nio.channels.ReadableByteChannel channel, boolean useMemoryMappedBuffer) throws java.io.IOException
channel
- The readable channel to use.useMemoryMappedBuffer
- Wether or not map the file in memory
java.io.IOException
- If an error occurs while initializing.Method Detail |
public DbaseFileHeader getHeader()
public void close() throws java.io.IOException
java.io.IOException
- If an error occurs.public boolean hasNext()
public java.lang.Object[] readEntry() throws java.io.IOException
java.io.IOException
- If an error occurs.public DbaseFileReader.Row readRow() throws java.io.IOException
java.io.IOException
public void skip() throws java.io.IOException
java.io.IOException
- If an error occurs.public java.lang.Object[] readEntry(java.lang.Object[] entry, int offset) throws java.io.IOException
entry
- Th array to copy into.offset
- The offset to start at
java.io.IOException
- If an error occurs.public void transferTo(DbaseFileWriter writer) throws java.io.IOException
java.io.IOException
public void goTo(int recno) throws java.io.IOException, java.lang.UnsupportedOperationException
recno
-
java.io.IOException
java.lang.UnsupportedOperationException
public java.lang.Object[] readEntry(java.lang.Object[] entry) throws java.io.IOException
entry
- The array to copy into.
java.io.IOException
- If an error occurs.public static void main(java.lang.String[] args) throws java.lang.Exception
java.lang.Exception
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