| java.lang.Object
 org.geotools.data.shapefile.shp.ShapefileReader
| ShapefileReader | | public class ShapefileReader (Code) | | The general use of this class is:
FileChannel in = new FileInputStream("thefile.dbf").getChannel();
ShapefileReader r = new ShapefileReader( in ) while (r.hasNext()) { Geometry
shape = (Geometry) r.nextRecord().shape() // do stuff } r.close();
author:
jamesm
author:
aaime
author:
Ian Schneider |
| Inner Class :final public class Record | |
| Field Summary | |
| ByteBuffer | buffer
|
| Method Summary | |
| public void | close()
Clean up any resources. | | public static ByteBuffer | ensureCapacity(ByteBuffer buffer, int size, boolean useMemoryMappedBuffer)
| | public static int | fill(ByteBuffer buffer, ReadableByteChannel channel)
| | public int | getCount(int count)
Parses the shpfile counting the records. | | public ShapefileHeader | getHeader()
Get the header. | | public void | goTo(int offset)
| | public boolean | hasNext()
If there exists another record. | | public static void | main(String[] args)
| | public Record | nextRecord()
Fetch the next record information. | | public static ShapefileHeader | readHeader(ReadableByteChannel channel, boolean strict)
A short cut for reading the header from the given channel.
Parameters:
channel - The channel to read from.
Parameters:
strict - True to make the header parsing throw Exceptions if theversion or magic number are incorrect.
throws:
IOException - If problems arise. | | public Record | recordAt(int offset)
Sets the current location of the byteStream to offset and returns the
next record. | | public void | setHandler(ShapeHandler handler)
| | public Object | shapeAt(int offset)
| | public boolean | supportsRandomAccess()
| | public int | transferTo(ShapefileWriter writer, int recordNum, double[] bounds)
Transfer (by bytes) the data at the current record to the
ShapefileWriter. |
| buffer | | ByteBuffer buffer(Code) | | |
| ShapefileReader | | public ShapefileReader(ReadableByteChannel channel, boolean strict, boolean useMemoryMapped, Lock lock) throws IOException, ShapefileException(Code) | | Creates a new instance of ShapeFile.
Parameters:
channel - The ReadableByteChannel this reader will use.
Parameters:
strict - True to make the header parsing throw Exceptions if theversion or magic number are incorrect.
throws:
IOException - If problems arise.
throws:
ShapefileException - If for some reason the file contains invalid records. |
| close | | public void close() throws IOException(Code) | | Clean up any resources. Closes the channel.
throws:
IOException - If errors occur while closing the channel. |
| ensureCapacity | | public static ByteBuffer ensureCapacity(ByteBuffer buffer, int size, boolean useMemoryMappedBuffer)(Code) | | |
| getCount | | public int getCount(int count) throws DataSourceException(Code) | | Parses the shpfile counting the records.
the number of non-null records in the shapefile |
| getHeader | | public ShapefileHeader getHeader()(Code) | | Get the header. Its parsed in the constructor.
The header that is associated with this file. |
| hasNext | | public boolean hasNext() throws IOException(Code) | | If there exists another record. Currently checks the stream for the
presence of 8 more bytes, the length of a record. If this is true and the
record indicates the next logical record number, there exists more
records.
throws:
IOException - True if has next record, false otherwise. |
| nextRecord | | public Record nextRecord() throws IOException(Code) | | Fetch the next record information.
throws:
IOException - The record instance associated with this reader. |
| readHeader | | public static ShapefileHeader readHeader(ReadableByteChannel channel, boolean strict) throws IOException(Code) | | A short cut for reading the header from the given channel.
Parameters:
channel - The channel to read from.
Parameters:
strict - True to make the header parsing throw Exceptions if theversion or magic number are incorrect.
throws:
IOException - If problems arise. A ShapefileHeader object. |
| recordAt | | public Record recordAt(int offset) throws IOException, UnsupportedOperationException(Code) | | Sets the current location of the byteStream to offset and returns the
next record. Usually used in conjuctions with the shx file or some other
index file.
Parameters:
offset - If using an shx file the offset would be: 2 *(index.getOffset(i)) The record after the offset location in the bytestream
throws:
IOException - thrown in a read error occurs
throws:
UnsupportedOperationException - thrown if not a random access file |
| setHandler | | public void setHandler(ShapeHandler handler)(Code) | |
Parameters:
handler - The handler to set. |
| supportsRandomAccess | | public boolean supportsRandomAccess()(Code) | | |
| transferTo | | public int transferTo(ShapefileWriter writer, int recordNum, double[] bounds) throws IOException(Code) | | Transfer (by bytes) the data at the current record to the
ShapefileWriter.
Parameters:
bounds - double array of length four for transfering the bounds into The length of the record transfered in bytes |
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