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package bjc.utils.ioutils.blocks;
import java.io.*;
import java.util.Iterator;
/** Utility methods for constructing instances of {@link BlockReader}
*
* @author bjculkin */
public class BlockReaders {
/** Create a new simple block reader that works off a regex.
*
* @param blockDelim The regex that separates blocks.
* @param source The reader to get blocks from.
*
* @return A configured simple reader. */
public static SimpleBlockReader simple(
final String blockDelim, final Reader source)
{
return new SimpleBlockReader(blockDelim, source);
}
/** Create a new pushback block reader.
*
* @param src The block reader to read blocks from.
*
* @return A configured pushback reader. */
public static PushbackBlockReader pushback(final BlockReader src) {
return new PushbackBlockReader(src);
}
/** Create a new triggered block reader.
*
* @param source The block reader to read blocks from.
* @param action The action to execute before reading a block.
*
* @return A configured triggered block reader. */
public static BlockReader trigger(
final BlockReader source, final Runnable action)
{
return new TriggeredBlockReader(source, action);
}
/** Create a new layered block reader.
*
* @param primary The first source to read blocks from.
* @param secondary The second source to read blocks from.
*
* @return A configured layered block reader. */
public static BlockReader layered(
final BlockReader primary, final BlockReader secondary)
{
return new LayeredBlockReader(primary, secondary);
}
/** Create a new serial block reader.
*
* @param readers The readers to pull from, in the order to pull from them.
*
* @return A configured serial block reader. */
public static BlockReader serial(final BlockReader... readers) {
return new SerialBlockReader(readers);
}
/**
* Create a block reader from an iterator of blocks.
*
* @param iter The iterator of blocks.
*
* @return A block reader which returns blocks from the given iterator.
*/
public static BlockReader fromIterator(final Iterator<Block> iter) {
return new IteratorBlockReader(iter);
}
}
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