Java Collection Null removeNulls(Collection p_collection)

Description

Removes null objects from the Collection.

License

Apache License

Parameter

Parameter	Description
p_collection	a Collection

Declaration

public static boolean removeNulls(Collection p_collection) 

Method Source Code

//package com.java2s;
/**// ww w  . j  a v  a 2s .c o m
 *  Copyright 2009 Welocalize, Inc. 
 *  
 *  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.
 *  
 */

import java.util.Collection;
import java.util.Iterator;

import java.util.List;
import java.util.ArrayList;

public class Main {
    /**
     * Removes null objects from the Collection.
     * @param p_collection a Collection
     * @returns true if one or more null objects were removed.
     */
    public static boolean removeNulls(Collection p_collection) {
        if (p_collection == null) {
            return false;
        }
        boolean removed = false;
        Iterator it = p_collection.iterator();
        while (it.hasNext()) {
            Object o = it.next();
            if (o == null) {
                removed = true;
                it.remove();
            }
        }
        return removed;
    }

    /**
     * Removes the element at the specified position in 
     * the collection. 
     * Shifts any subsequent elements to the left 
     * (subtracts one from their indices). 
     * Returns the element that was removed from the Collection.
     * @param p_collection a Collection
     * @param p_index the index of the element to removed.
     * @param p_numberOfObjects the number of objects to remove.
     * @returns a collection with the elements at p_index removed.
     */
    public static Collection remove(Collection p_collection, int p_index, int p_numberOfObjects) {
        if (p_collection == null) {
            return null;
        }
        List returnList = new ArrayList(p_collection.size() - p_numberOfObjects);
        Iterator it = p_collection.iterator();
        for (int i = 0; it.hasNext(); i++) {
            if (i < p_index || i >= p_index + p_numberOfObjects) {
                returnList.add(it.next());
            } else {
                it.next();
            }
        }
        return returnList;
    }
}

Related

1. padWithNulls(final Collection s1, final Collection s2)
2. removeAllIfNotNull(final Collection collection, final Collection c)
3. removeNull(Collection collection)
4. removeNull(final Collection c)
5. removeNullElement(Collection collection)
6. removeNulls(F collection)
7. removeNulls(final Collection collection)
8. sortNumbers( Collection values, boolean removeNull)
9. stripNulls(T collection)