Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010 BSI Business Systems Integration AG.
 * 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:
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/

import java.util.Collection;
import java.util.Collections;

import java.util.Map;

public class Main {
    @SuppressWarnings("unchecked")
    public static <T, U> T[] getKeyArray(Map<T, U> m, Class<T> clazz) {
        if (m == null || m.size() == 0) {
            T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, 0);
            return Collections.<T>emptyList().toArray(a);
        } else {
            T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, m.size());
            return m.keySet().toArray(a);
        }
    }

    public static <T> int size(Collection<T> list) {
        if (list == null) {
            return 0;
        }
        return list.size();
    }

    @SuppressWarnings("unchecked")
    public static <T> T[] toArray(Collection<T> c, Class<T> clazz) {
        if (c == null || c.size() == 0) {
            T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, 0);
            return Collections.<T>emptyList().toArray(a);
        } else {
            T[] a = (T[]) java.lang.reflect.Array.newInstance(clazz, c.size());
            return c.toArray(a);
        }
    }
}