org.keycloak.common.util.CollectionUtil Maven / Gradle / Ivy
/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.keycloak.common.util;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* @author Jeroen Rosenberg
*/
public class CollectionUtil {
public static String join(Collection strings) {
return join(strings, ", ");
}
public static String join(Collection strings, String separator) {
return strings.stream().collect(Collectors.joining(String.valueOf(separator)));
}
// Return true if all items from col1 are in col2 and viceversa. Order is not taken into account
public static boolean collectionEquals(Collection col1, Collection col2) {
if (col1.size()!=col2.size()) {
return false;
}
Map countMap = new HashMap<>();
for(T o : col1) {
countMap.merge(o, 1, (v1, v2) -> v1 + v2);
}
for(T o : col2) {
Integer v = countMap.get(o);
if (v==null) {
return false;
}
if (v == 1) {
countMap.remove(o);
} else {
countMap.put(o, v-1);
}
}
return countMap.isEmpty();
}
public static boolean isEmpty(Collection> collection) {
return collection == null || collection.isEmpty();
}
public static boolean isNotEmpty(Collection> collection) {
return !isEmpty(collection);
}
public static Set collectionToSet(Collection collection) {
return collection == null ? null : new HashSet<>(collection);
}
}
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