javatools.datatypes.FinalMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javatools Show documentation

The Javatools are a collection of Java classes for a variety of small tasks, such as parsing, database interaction or file handling.

The newest version!

package javatools.datatypes;

import java.util.TreeMap;

/** 
Copyright 2016 Fabian M. Suchanek

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. 

Provides a nicer constructor for a TreeMap. 
Example:
   FinalMap<String,Integer> f=new FinalMap(
     "a",1,
     "b",2,
     "c",3);
   System.out.println(f.get("b"));
   --> 2

*/
public class FinalMap extends TreeMap {

  private static final long serialVersionUID = 1L;

  /** Constructs a FinalMap from an array that contains key/value sequences */
  @SuppressWarnings("unchecked")
  public FinalMap(Object... a) {
    super();
    for (int i = 0; i < a.length - 1; i += 2) {
      if (containsKey(a[i])) throw new RuntimeException("Duplicate key in FinalMap: " + a[i]);
      put((T1) a[i], (T2) a[i + 1]);
    }
  }

  /** Test routine */
  public static void main(String[] args) {
    FinalMap f = new FinalMap("a", 1, "b", 2);
    System.out.println(f.get("b"));
  }
}