Add BoundBlockReader

BoundBlockReader is a BlockReader that draws blocks from a pair of
functions.

Thus, it is the most general of the BlockReaders, in that you could
probably implement any of them with suitably chosen functions.

1 files changed, 48 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/ioutils/blocks/BoundBlockReader.java b/BJC-Utils2/src/main/java/bjc/utils/ioutils/blocks/BoundBlockReader.java
new file mode 100644
index 0000000..3c9a872
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/ioutils/blocks/BoundBlockReader.java
@@ -0,0 +1,48 @@
+package bjc.utils.ioutils.blocks;
+
+import java.io.IOException;
+
+import java.util.function.Supplier;
+
+public class BoundBlockReader implements BlockReader {
+	private BooleanSupplier checker;
+	private Supplier<Block> getter;
+
+	private Block current;
+
+	private int blockNo;
+
+	public BoundBlockReader(BooleanSupplier blockChecker, Supplier<Block> blockGetter) {
+		checker = blockChecker;
+		getter  = blockGetter;
+
+		blockNo += 1;
+	}
+
+	@Override
+	public boolean hasNextBlock() {
+		return blockChecker.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;
+	}
+}