utils/src/main/java/com/cloud/utils/IteratorUtil.java

//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 com.cloud.utils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;

public class IteratorUtil {
    public static <T> Iterable<T> enumerationAsIterable(final Enumeration<T> e) {
        return new Iterable<T>() {
            @Override
            public Iterator<T> iterator() {
                return new Iterator<T>() {
                    @Override
                    public boolean hasNext() {
                        return e.hasMoreElements();
                    }

                    @Override
                    public T next() {
                        return e.nextElement();
                    }

                    @Override
                    public void remove() {
                        throw new UnsupportedOperationException();
                    }
                };
            }
        };
    }

    public static <T> Enumeration<T> iteratorAsEnumeration(final Iterator<T> it) {
        return new Enumeration<T>() {
            @Override
            public boolean hasMoreElements() {
                return it.hasNext();
            }

            @Override
            public T nextElement() {
                return it.next();
            }
        };
    }

    public static <T extends Comparable<? super T>> List<T> asSortedList(Collection<T> c) {
        List<T> list = new ArrayList<T>(c);
        java.util.Collections.sort(list);
        return list;
    }
}