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package bjc.utils.ioutils.blocks;
import java.io.IOException;
import java.util.function.UnaryOperator;
/**
* A block reader that applies a transform to each block.
*
* @author EVE
*
*/
public class MappedBlockReader implements BlockReader {
private BlockReader reader;
private Block current;
private UnaryOperator<Block> transform;
private int blockNo;
/**
* Create a new mapped block reader.
*
* @param source
* The source for blocks
* @param trans
* The transform to apply.
*/
public MappedBlockReader(BlockReader source, UnaryOperator<Block> trans) {
reader = source;
transform = trans;
blockNo = 0;
}
@Override
public boolean hasNextBlock() {
return reader.hasNextBlock();
}
@Override
public Block getBlock() {
return current;
}
@Override
public boolean nextBlock() {
if(hasNextBlock()) {
current = transform.apply(reader.next());
blockNo += 1;
return true;
}
return false;
}
@Override
public int getBlockCount() {
return blockNo;
}
@Override
public void close() throws IOException {
reader.close();
}
}
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