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package bjc.utils.ioutils.blocks;
import java.io.*;
import bjc.data.*;
/** A block reader that toggles between two sources.
*
* @author EVE */
public class ToggledBlockReader implements BlockReader {
private BlockReader leftSource;
private BlockReader rightSource;
/* We choose the left source when this is true. */
private BooleanToggle leftToggle;
private int blockNo;
/** Create a new toggling block reader.
*
* @param left The first block reader to use.
* @param right The second block reader to use. */
public ToggledBlockReader(BlockReader left, BlockReader right) {
leftSource = left;
rightSource = right;
blockNo = 0;
leftToggle = new BooleanToggle();
}
@Override
public boolean hasNextBlock() {
if (leftToggle.peek()) return leftSource.hasNextBlock();
else return rightSource.hasNextBlock();
}
@Override
public Block getBlock() {
if (leftToggle.peek()) return leftSource.getBlock();
else return rightSource.getBlock();
}
@Override
public boolean nextBlock() {
boolean succ;
if (leftToggle.get()) {
succ = leftSource.nextBlock();
} else {
succ = rightSource.nextBlock();
}
if (succ) blockNo += 1;
return succ;
}
@Override
public int getBlockCount() {
return blockNo;
}
@Override
public void close() throws IOException {
leftSource.close();
rightSource.close();
}
}
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