Java Nano Second Convert stringToNanoseconds(String time)

Description

Convert a string representing a time to the corresponding long.

License

Open Source License

Parameter

Parameter	Description
time	the string to convert

Return

the corresponding nanoseconds value

Declaration

public static long stringToNanoseconds(String time) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2009, 2011 Ericsson/*from w  w  w  . jav a2s.c  om*/
 * 
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *   William Bourque - Initial API and implementation
 *   Francois Chouinard - Cleanup and refactoring
 *******************************************************************************/

public class Main {
    /**
     * Convert a string representing a time to the corresponding long.
     * <p>
     * 
     * @param time the string to convert
     * @return the corresponding nanoseconds value
     */
    public static long stringToNanoseconds(String time) {

        long result = 0L;
        StringBuffer buffer = new StringBuffer(time);

        try {
            int dot = buffer.indexOf("."); //$NON-NLS-1$

            // Prepend a "." if none was found (assume ns)
            if (dot == -1) {
                buffer.insert(0, "."); //$NON-NLS-1$
                dot = 0;
            }

            // Zero-pad the string for nanoseconds
            for (int i = buffer.length() - dot - 1; i < 9; i++)
                buffer.append("0"); //$NON-NLS-1$

            // Remove the extra decimals if present
            int nbDecimals = buffer.substring(dot + 1).length();
            if (nbDecimals > 9)
                buffer.delete(buffer.substring(0, dot + 1 + 9).length(), buffer.length());

            // Do the conversion
            long seconds = (dot > 0) ? Long.parseLong(buffer.substring(0, dot)) : 0;
            seconds = Math.abs(seconds);
            long nanosecs = Long.parseLong(buffer.substring(dot + 1));
            result = seconds * 1000000000 + nanosecs;

        } catch (NumberFormatException e) {
            // TODO: Find something interesting to say
        }

        return result;
    }
}

Related

1. nanoToSeconds(double nano)
2. nanoToSecs(final long nanoTime)
3. nanoToStr(long tsp)
4. nowInNanoseconds()
5. parseNanoseconds(String s)