added IndentWriter

src/main/java/kieker/analysis/util/IndentWriter.java

+package kieker.analysis.util;
+
+import java.io.IOException;
+import java.io.Writer;
+
+public class IndentWriter extends Writer {
+
+	private final Writer writer;
+
+	private int indented = 0;
+	private char indentChar = DEFAULT_INDENT_CHAR;
+	private int indentLength = DEFAULT_INDENT_LENGTH;
+
+	public static final char DEFAULT_INDENT_CHAR = '\t';
+	public static final int DEFAULT_INDENT_LENGTH = 1;
+
+	public IndentWriter(final Writer writer) {
+		super();
+		this.writer = writer;
+	}
+
+	public IndentWriter(final Writer writer, final char indentChar, final int indentLength) {
+		this(writer);
+		this.indentChar = indentChar;
+		this.indentLength = indentLength;
+	}
+
+	public void indent() {
+		indented++;
+	}
+
+	public void unindent() {
+		if (indented > 0) {
+			indented--;
+		}
+	}
+
+	public void writeln(final String str) throws IOException {
+		writer.write(getIndentChars() + str + '\n');
+	}
+
+	private String getIndentChars() {
+		return new String(new char[indentLength]).replace('\0', indentChar);
+	}
+
+	@Override
+	public void write(final char[] cbuf, final int off, final int len) throws IOException {
+		writer.write(cbuf, off, len);
+	}
+
+	@Override
+	public void flush() throws IOException {
+		writer.flush();
+	}
+
+	@Override
+	public void close() throws IOException {
+		writer.close();
+	}
+
+}