com.threewks.thundr.view.jsp.el.CollectionFunctions.java Source code

Introduction

Here is the source code for com.threewks.thundr.view.jsp.el.CollectionFunctions.java

Source

/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2015 3wks, <thundr@3wks.com.au>
 *
 * 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.threewks.thundr.view.jsp.el;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.atomicleopard.expressive.Cast;

public class CollectionFunctions {

    /**
     * 
     * @param collectionOrArray a {@link Collection} or array of object
     * @param objectCollectionOrArray a single object, and array of objects or a {@link Collection} of objects
     * @return true if the first argument contains all of the elements in the second argument. If the second argument is an empty collection, returns true. if the second element is null, returns true
     *         if a null is contained in the first argument.
     */
    @SuppressWarnings("unchecked")
    public static boolean contains(Object collectionOrArray, Object objectCollectionOrArray) {
        Collection<Object> collection = toCollection(collectionOrArray);
        Collection<Object> asCollection = Cast.as(objectCollectionOrArray, Collection.class);
        if (asCollection == null) {
            asCollection = isArray(objectCollectionOrArray) ? Arrays.asList((Object[]) objectCollectionOrArray)
                    : Collections.singleton(objectCollectionOrArray);
        }

        return collection.containsAll(asCollection);
    }

    /**
     * @param collectionOrArray a {@link Collection} or array of object
     * @param objectCollectionOrArray a single object, and array of objects or a {@link Collection} of objects
     * @return true if the first argument contains any of the elements in the second argument. If the second argument is an empty collection, returns true. if the second element is null, returns true
     *         if a null is contained in the first argument.
     */
    @SuppressWarnings("unchecked")
    public static boolean containsAny(Object collectionOrArray, Object objectCollectionOrArray) {
        Collection<Object> collection = toCollection(collectionOrArray);
        Collection<Object> asCollection = Cast.as(objectCollectionOrArray, Collection.class);
        if (asCollection == null) {
            asCollection = isArray(objectCollectionOrArray) ? Arrays.asList((Object[]) objectCollectionOrArray)
                    : Collections.singleton(objectCollectionOrArray);
        }
        for (Object o : asCollection) {
            if (collection.contains(o)) {
                return true;
            }
        }
        return asCollection.isEmpty();
    }

    /**
     * Joins the given collection or array using the object toString and the given separator.
     * @param collectionOrArray a {@link Collection} or array of object
     * @param separator the separator token to use when joining the content of the given collection
     */
    public static String join(Object collectionOrArray, Object separator) {
        List<Object> collection = toCollection(collectionOrArray);
        return StringUtils.join(collection, separator == null ? "" : separator.toString());
    }

    private static List<Object> toCollection(Object collectionOrArray) {
        boolean isArray = isArray(collectionOrArray);
        return isArray ? Arrays.asList((Object[]) collectionOrArray)
                : collectionOrArray == null ? new ArrayList<Object>()
                        : new ArrayList<Object>((Collection<?>) collectionOrArray);
    }

    private static boolean isArray(Object object) {
        return object == null ? false : object.getClass().isArray();
    }
}