com.feilong.core.util.EnumerationUtil.java Source code

Introduction

Here is the source code for com.feilong.core.util.EnumerationUtil.java

Source

/*
 * Copyright (C) 2008 feilong
 *
 * Licensed 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.feilong.core.util;

import java.util.Enumeration;

import org.apache.commons.collections4.IteratorUtils;
import org.apache.commons.collections4.iterators.EnumerationIterator;

import static com.feilong.core.Validator.isNullOrEmpty;

/**
 * {@link Enumeration}.
 * 
 * <p>
 * {@link Enumeration}?JDK 1.0,?,Vector{@link Enumeration}?<br>
 * {@link Enumeration},JDK1.5?Enumeration,?
 * </p>
 * 
 * <h3>?{@link Enumeration}?</h3>
 * 
 * <blockquote>
 * <p>
 * {@link Enumeration}Iterator??,{@link Enumeration}??? ???,?{@link Enumeration}
 * </p>
 * <p>
 * ??{@link Enumeration}?<br>
 * Java??,??(,Web??){@link Enumeration}?,???
 * </p>
 * <p>
 * IteratorJDK1.2??,HashMap?ArrayList??????<br>
 * Iterator?fail-fast:???,?fail-fast
 * </p>
 * </blockquote>
 *
 * @author <a href="http://feitianbenyue.iteye.com/">feilong</a>
 * @see org.apache.commons.collections4.EnumerationUtils
 * @since 1.5.3
 */
public final class EnumerationUtil {

    /** Don't let anyone instantiate this class. */
    private EnumerationUtil() {
        //AssertionError?. ?????. ???.
        //see Effective Java 2nd
        throw new AssertionError("No " + getClass().getName() + " instances for you!");
    }

    /**
     * <code>enumeration</code>?,?<code>value</code>.
     *
     * @param <O>
     *            the generic type
     * @param enumeration
     *            the enumeration
     * @param value
     *            
     * @return  <code>enumeration</code> nullempty, false<br>
     *         ? contains true,<br>
     *         false
     * @see "org.springframework.util.CollectionUtils#contains(Enumeration, Object)"
     * @see org.apache.commons.collections4.iterators.EnumerationIterator
     * @see org.apache.commons.collections4.IteratorUtils#contains(java.util.Iterator, Object)
     */
    public static <O> boolean contains(Enumeration<O> enumeration, O value) {
        return isNullOrEmpty(enumeration) ? false
                : IteratorUtils.contains(new EnumerationIterator<O>(enumeration), value);
    }
}