package nabble.naml.compiler;

import java.io.Writer;


public class TemplatePrintWriter extends PrintWriter {

	public static final TemplatePrintWriter NULL = new TemplatePrintWriter( new Writer() {
		public void write(char[] cbuf,int off,int len) {}
		public void flush() {}
		public void close() {}
	} );

	public TemplatePrintWriter(Writer out) {
		super(out);
	}

	public void print(Object obj) {
		if( obj == null )
			throw new NamlNullPointerException("null written to stream");
		if( obj instanceof BlockWrapper ) {
			((BlockWrapper)obj).printTo(this);
		} else {
			super.print(obj);
		}
	}

	public void print(String s) {
		if( s == null )
			throw new NamlNullPointerException("null written to stream");
		super.print(s);
	}

	public void print(Boolean b) {
		throw new RuntimeException("no Booleans allowed, use boolean instead");
	}

}