Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.ArrayList;

import java.util.Collections;
import java.util.HashMap;

import java.util.List;
import java.util.Map;

public class Main {
    public static <K, V> Map<K, List<V>> copyNullSafeMultiHashMapReified(Class<V> valueType,
            Map<? extends K, List<?>> map) {
        if (valueType == null)
            throw new NullPointerException("valueType");
        if (map == null)
            throw new NullPointerException("map");

        @SuppressWarnings("unchecked")
        Map<K, List<V>> result = (Map<K, List<V>>) (Map<?, ?>) copyNullSafeMutableHashMap(map);
        for (Map.Entry<K, List<V>> entry : result.entrySet()) {
            List<V> value = entry.getValue();
            ArrayList<V> valueCopy = new ArrayList<V>(value);
            for (V element : valueCopy) {
                valueType.cast(element);
            }

            entry.setValue(Collections.unmodifiableList(valueCopy));
        }
        return result;
    }

    public static <K, V> Map<K, V> copyNullSafeMutableHashMap(Map<? extends K, ? extends V> map) {
        if (map == null)
            throw new NullPointerException("map");

        Map<K, V> result = new HashMap<K, V>(map);
        for (Map.Entry<K, V> entry : result.entrySet()) {
            if (entry.getKey() == null)
                throw new NullPointerException("entry.getKey()");
            if (entry.getValue() == null)
                throw new NullPointerException("entry.getValue()");
        }
        return result;
    }
}