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package bjc.utils.ioutils.blocks;
import java.io.IOException;
/**
* A block reader that fires an action before a block is actually read.
*
* @author bjculkin
*
*/
public class TriggeredBlockReader implements BlockReader {
private final BlockReader source;
/*
* The action to fire.
*/
private final Runnable action;
/**
* Create a new triggered reader with the specified source/action.
*
* @param source
* The block reader to read blocks from.
*
* @param action
* The action to execute before reading a block.
*/
public TriggeredBlockReader(final BlockReader source, final Runnable action) {
super();
this.source = source;
this.action = action;
}
@Override
public boolean hasNextBlock() {
action.run();
return source.hasNextBlock();
}
@Override
public Block getBlock() {
return source.getBlock();
}
@Override
public boolean nextBlock() {
return source.nextBlock();
}
@Override
public int getBlockCount() {
return source.getBlockCount();
}
@Override
public void close() throws IOException {
source.close();
}
@Override
public String toString() {
return String.format("TriggeredBlockReader [source=%s]", source);
}
}
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