/*

 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.internal.tool;

import java.io.PrintWriter;

abstract class StructuredWriter {

    private final static String LINE_SEPARATOR = String.format("%n");

    private final PrintWriter out;

    private final StringBuilder builder = new StringBuilder(4000);

    private char[] indentionArray = new char[0];

    private int indent = 0;

    private int column;

    // print first event immediately so tool feels responsive

    private boolean first = true;

    StructuredWriter(PrintWriter p) {

        out = p;

    }

    final protected int getColumn() {

        return column;

    }

    // Flush to print writer

    public final void flush(boolean hard) {

        if (hard) {

            out.print(builder.toString());

            builder.setLength(0);

            return;

        }

        if (first || builder.length() > 100_000) {

            out.print(builder.toString());

            builder.setLength(0);

            first = false;

        }

    }

    final public void printIndent() {

        builder.append(indentionArray, 0, indent);

        column += indent;

    }

    final public void println() {

        builder.append(LINE_SEPARATOR);

        column = 0;

    }

    final public void print(String... texts) {

        for (String text : texts) {

            print(text);

        }

    }

    final public void printAsString(Object o) {

        print(String.valueOf(o));

    }

    final public void print(String text) {

        builder.append(text);

        column += text.length();

    }

    final public void print(char c) {

        builder.append(c);

        column++;

    }

    final public void print(int value) {

        print(String.valueOf(value));

    }

    final public void indent() {

        indent += 2;

        updateIndent();

    }

    final public void retract() {

        indent -= 2;

        updateIndent();

    }

    final public void println(String text) {

        print(text);

        println();

    }

    private void updateIndent() {

        if (indent > indentionArray.length) {

            indentionArray = new char[indent];

            for (int i = 0; i < indentionArray.length; i++) {

                indentionArray[i] = ' ';

            }

        }

    }

}