org.apache.cxf.common.util.CollectionUtils Maven / Gradle / Ivy
/**
* 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 org.apache.cxf.common.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
public final class CollectionUtils {
private CollectionUtils() {
}
public static Collection diff(Collection c1, Collection c2) {
if (c1 == null || c1.size() == 0 || c2 == null || c2.size() == 0) {
return c1;
}
Collection difference = new ArrayList();
for (T item : c1) {
if (!c2.contains(item)) {
difference.add(item);
}
}
return difference;
}
public static boolean isEmpty(Collection c) {
if (c == null || c.size() == 0) {
return true;
}
for (Iterator iter = c.iterator(); iter.hasNext();) {
if (iter.next() != null) {
return false;
}
}
return true;
}
}