get Sorted Value Array from SortedMap - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

get Sorted Value Array from SortedMap

Demo Code

/*******************************************************************************
 * 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:/*w w  w.j ava 2s.co  m*/
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/
//package com.book2s;

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

import java.util.SortedMap;

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

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