net.dongliu.commons.lang.IO Maven / Gradle / Ivy

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package net.dongliu.commons.lang;

import java.io.OutputStream;
import java.io.PrintStream;

/**
 * utils method do to output and input.
 * Examples:
 * {@code
 *     IO.println("test").println("another test");
 *     IO.printer().sep(" -- ").end("-\n").println(1, 2, "test1").println("test");
 * }
 * 
 *
 * @author Dong Liu
 */
public class IO {

    /**
     * print parameters
     */
    public static Printer println(Object... params) {
        return Printer.defaultPrinter.println(params);
    }

    /**
     * print parameters
     */
    public static Printer print(Object... params) {
        return Printer.defaultPrinter.print(params);
    }


    /**
     * create new custom printer
     *
     * @return
     */
    public static Printer.Builder printer() {
        return Printer.newBuilder();
    }


    public static class Printer {
        private final String sep;
        private final String end;
        private final PrintStream out;

        public Printer(String sep, String end, PrintStream out) {
            this.sep = sep;
            this.end = end;
            this.out = out;
        }

        private static Printer defaultPrinter = newBuilder().build();

        /**
         * print parameters, without line end
         */
        public Printer print(Object... params) {
            _print(params, false);
            return this;
        }

        /**
         * print parameters
         */
        public Printer println(Object... params) {
            _print(params, true);
            return this;
        }

        private  void _print(T[] params, boolean printEnd) {
            int i = 0;
            for (T param : params) {
                out.print(param);
                if (i++ != params.length - 1) {
                    out.print(sep);
                } else if (printEnd) {
                    out.print(end);
                }
            }
        }

        private static Builder newBuilder() {
            return new Builder();
        }

        public static class Builder {
            private String separator = " ";
            private String end = "\n";
            private PrintStream out = System.out;

            /**
             * set sep. default " "
             */
            public Builder sep(String delimiter) {
                this.separator = delimiter;
                return this;
            }

            /**
             * set line end. default "\n"
             */
            public Builder end(String end) {
                this.end = end;
                return this;
            }

            /**
             * set output. default System.out
             */
            public Builder out(PrintStream out) {
                this.out = out;
                return this;
            }

            /**
             * set output. default System.out
             */
            public Builder out(OutputStream out) {
                this.out = new PrintStream(out);
                return this;
            }

            public Printer build() {
                return new Printer(separator, end, out);
            }

            public Printer print(Object... params) {
                return this.build().print(params);
            }

            public Printer println(Object... params) {
                return this.build().println(params);
            }
        }

    }

}