Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * This file is part of McIDAS-V
 *
 * Copyright 2007-2015
 * Space Science and Engineering Center (SSEC)
 * University of Wisconsin - Madison
 * 1225 W. Dayton Street, Madison, WI 53706, USA
 * http://www.ssec.wisc.edu/mcidas
 * 
 * All Rights Reserved
 * 
 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
 * some McIDAS-V source code is based on IDV and VisAD source code.  
 * 
 * McIDAS-V is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * McIDAS-V 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see http://www.gnu.org/licenses.
 */

import java.util.Collection;

import java.util.Iterator;

import java.util.Map;

public class Main {
    /**
     * Determines the {@literal "length"} of a given object. This method 
     * currently understands:<ul>
     * <li>{@link Collection}</li>
     * <li>{@link Map}</li> 
     * <li>{@link CharSequence}</li>
     * <li>{@link Array}</li>
     * <li>{@link Iterable}</li>
     * <li>{@link Iterator}</li>
     * </ul>
     * 
     * <p>More coming!
     * 
     * @param o {@code Object} whose length we want. Cannot be {@code null}.
     * 
     * @return {@literal "Length"} of {@code o}.
     * 
     * @throws NullPointerException if {@code o} is {@code null}.
     * @throws IllegalArgumentException if the method doesn't know how to test
     * whatever type of object {@code o} might be.
     */
    @SuppressWarnings({ "WeakerAccess" })
    public static int len(final Object o) {
        if (o == null) {
            throw new NullPointerException("Null arguments do not have a length");
        }
        if (o instanceof Collection<?>) {
            return ((Collection<?>) o).size();
        } else if (o instanceof Map<?, ?>) {
            return ((Map<?, ?>) o).size();
        } else if (o instanceof CharSequence) {
            return ((CharSequence) o).length();
        } else if (o instanceof Iterator<?>) {
            int count = 0;
            Iterator<?> it = (Iterator<?>) o;
            while (it.hasNext()) {
                it.next();
                count++;
            }
            return count;
        } else if (o instanceof Iterable<?>) {
            return len(((Iterable<?>) o).iterator());
        }

        throw new IllegalArgumentException("Don't know how to find the length of a " + o.getClass().getName());
    }
}