Merge the given Properties instance into the given Map, copying all properties (key-value pairs) over. - Java java.util

Java examples for java.util:Map Value

  1. HOME
  2. Java
  3. java.util
  4. Map Value

Description

Merge the given Properties instance into the given Map, copying all properties (key-value pairs) over.

Demo Code

/*//from  ww  w.j  av a  2 s  .  c o m
 * Copyright 2002-2015 the original author or authors.
 *
 * 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.java2s;
import java.util.*;

public class Main {
    /**
     * Merge the given Properties instance into the given Map,
     * copying all properties (key-value pairs) over.
     * <p>Uses {@code Properties.propertyNames()} to even catch
     * default properties linked into the original Properties instance.
     *
     * @param props the Properties instance to merge (may be {@code null})
     * @param map   the target Map to merge the properties into
     */
    @SuppressWarnings("unchecked")
    public static <K, V> void mergePropertiesIntoMap(Properties props,
            Map<K, V> map) {
        if (map == null) {
            throw new IllegalArgumentException("Map must not be null");
        }
        if (props != null) {
            for (Enumeration<?> en = props.propertyNames(); en
                    .hasMoreElements();) {
                String key = (String) en.nextElement();
                Object value = props.getProperty(key);
                if (value == null) {
                    // Potentially a non-String value...
                    value = props.get(key);
                }
                map.put((K) key, (V) value);
            }
        }
    }
}

Related Tutorials