Block.java
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Block.java
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	/*
	* Copyright (C) 2013-2015 Lannocc Technologies
	* @%@~LICENSE~@%@
	*/
	package com.iovar.web.bin.shell.task;

	// local imports:
	import com.iovar.web.dev.*;
	import com.iovar.web.proc.*;

	// java imports:
	import java.io.*;
	import javax.servlet.*;

	// 3rd-party imports:

	/**
	* A formalized group (i.e. list of operations surrounded by curly braces, invoked sequentially in a sub-shell).
	*
	* @author shawn@lannocc.com
	*/
	class Block implements Graph, Task
	{
	Group ops;

	public boolean assemble (final GraphReader in) throws GraphException, IOException
	{
	if ('{' != in.peek ()) return false;
	// FIXME: we really need a double-peek so we can require whitespace or newline after opening brace
	in.discard ();

	Log.debug ("will assemble");

	ops = new Group ();
	if (!ops.assemble (in)) ops = null;

	if ('}' != in.peek ()) throw new GraphException ("Missing closing curly brace");
	in.discard ();

	return true;
	}

	public Return exec (final TaskData task) throws IOException, ServletException
	{
	return ops.exec (task);
	}

	public String toString ()
	{
	final StringBuffer s = new StringBuffer ();
	s.append ("{ ");
	if (ops!=null) s.append (ops.toString ());
	s.append (" }");

	return s.toString ();
	}
	}