Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: LGPL 

import java.util.Collection;

import java.util.LinkedHashSet;

import java.util.Set;

public class Main {
    /**
     * Appends value to collection. If value is collection all elements are added, if value is object it is simply
     * added. If skipDuplicates is set to true, objects already contained in the collection are not added again. Note
     * that element would be type casted to collection type.
     * 
     * @param data
     *            is the collection to update - set, list, etc. Should be modifiable
     * @param value
     *            is value of type T or {@link Collection} of elements of type T
     * @param skipDuplicates
     *            whether to treat data as {@link Set}. Note if data is already {@link Set} parameter does not affect
     *            the result. Note if data already contains duplicate elements they are not affected.
     * @return the updated data collection
     */
    @SuppressWarnings("unchecked")
    public static <T> Collection<T> addValue(Collection<T> data, Object value, boolean skipDuplicates) {
        if (value instanceof Collection) {
            Collection<T> toBeAdded = (Collection<T>) value;
            if (skipDuplicates && !(data instanceof Set)) {
                Set<T> nonDuplicates = new LinkedHashSet<>(toBeAdded);
                nonDuplicates.removeAll(data);
                data.addAll(nonDuplicates);
            } else {
                data.addAll(toBeAdded);
            }
        } else if (value != null) {
            if (skipDuplicates && !(data instanceof Set) && data.contains(value)) {
                return data;
            }
            data.add((T) value);
        }
        return data;
    }
}