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package bjc.utils.ioutils.blocks;
import java.io.IOException;
import java.util.function.BooleanSupplier;
import java.util.function.Supplier;
/**
* A block reader composed from functions.
*
* @author EVE
*
*/
public class BoundBlockReader implements BlockReader {
/**
* A function that serves to close an I/O source.
*
* @author EVE
*
*/
@FunctionalInterface
public interface Closer {
/**
* Close the I/O source this is attached to.
*
* @throws IOException
* If something goes wrong
*/
public void close() throws IOException;
}
private BooleanSupplier checker;
private Supplier<Block> getter;
private Closer closer;
private Block current;
private int blockNo;
/**
* Create a new bound block reader.
*
* @param blockChecker
* Predicate for checking if a block is available
* @param blockGetter
* Function to retrieve a block
* @param blockCloser
* Function to close a block source
*/
public BoundBlockReader(BooleanSupplier blockChecker, Supplier<Block> blockGetter, Closer blockCloser) {
checker = blockChecker;
getter = blockGetter;
closer = blockCloser;
blockNo = 0;
}
@Override
public boolean hasNextBlock() {
return checker.getAsBoolean();
}
@Override
public Block getBlock() {
return current;
}
@Override
public boolean nextBlock() {
if(checker.getAsBoolean()) {
current = getter.get();
blockNo += 1;
return true;
}
return false;
}
@Override
public int getBlockCount() {
return blockNo;
}
@Override
public void close() throws IOException {
closer.close();
}
}
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