Info.java

/*
 * Copyright 2011 Harald Wellmann.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ops4j.pax.exam.forked.provision;

public final class Info {

    private static final int LABEL_LENGTH = 1;
    private static final String SPACES = "                                                                            ";

    private Info() {
        // utility class
    }

    public static void println(final String message) {
        println(null, message);
    }

    public static void print(final String message) {
        print(null, message);
    }

    public static void println() {
        System.out.println();
    }

    public static void println(final String label, final String message) {
        print(label, message);
        println();
    }

    public static void print(final String label, final String message) {
        if (label != null) {
            System.out.print(format(label + ":"));
        }
        else {
            System.out.print(format(""));
        }
        if (message != null) {
            if (label != null) {
                System.out.print(" " + message);
            }
            else {
                System.out.print(" -> " + message);
            }
        }
    }

    private static String format(final String toFormat) {
        if (toFormat == null) {
            return fill(LABEL_LENGTH);
        }
        if (toFormat.length() >= LABEL_LENGTH) {
            return toFormat.substring(toFormat.length() - LABEL_LENGTH);
        }
        return fill(LABEL_LENGTH - toFormat.length()) + toFormat;
    }

    private static String fill(final int length) {
        return SPACES.substring(0, Math.min(length, LABEL_LENGTH) - 1);
    }

}