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package bjc.utils.ioutils.blocks;
import java.io.*;
import java.util.function.*;
/** 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;
} else {
return false;
}
}
@Override
public int getBlockCount() {
return blockNo;
}
@Override
public void close() throws IOException {
closer.close();
}
}
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