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January 29, 2012 16:58
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Java Simple Key Value Pair
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package ai.ilikeplaces.util; | |
import ai.ilikeplaces.doc.License; | |
/** | |
* Simple Key Value Pair. | |
* <p/> | |
* <p/> | |
* Example Usage: | |
* <p/> | |
* <p/> | |
* <code> | |
* System.out.println(new Pair<String, Integer>().setPair("Susan Boyle", 1).toString()); | |
* </code> | |
* <p/> | |
* <code> | |
* System.out.println(new Pair<String, Integer>().setKey("Susan Boyle").setValue(1).toString()); | |
* </code> | |
* <p/> | |
* <code> | |
* System.out.println(new Pair<String, Integer>("Susan Boyle", 1).toString()); | |
* </code> | |
* <p/> | |
* <p/> | |
* <p/> | |
* {@link #equals(Object)} checks only on key for equality | |
* <p/> | |
* Created by IntelliJ IDEA. | |
* User: <a href="http://www.ilikeplaces.com"> http://www.ilikeplaces.com </a> | |
* Date: Oct 10, 2010 | |
* Time: 5:36:16 PM | |
*/ | |
@License(content = "This code is licensed under Apache License Version 2.0") | |
public class Pair<K, V> { | |
private K key; | |
private V value; | |
private static final String OPEN_BRACE = "{"; | |
private static final String COMMA = ","; | |
private static final String CLOSE_BRACE = "}"; | |
public Pair() { | |
} | |
/** | |
* @param key key to be set | |
* @param value value to be set | |
*/ | |
public Pair(final K key, final V value) { | |
this.key = key; | |
this.value = value; | |
} | |
/** | |
* @param key key to be set | |
* @param value value to be set | |
* @return this | |
*/ | |
public Pair<K, V> setPair(final K key, final V value) { | |
this.key = key; | |
this.value = value; | |
return this; | |
} | |
/** | |
* @return key | |
*/ | |
public K getKey() { | |
return key; | |
} | |
/** | |
* @param key key to be set | |
* @return this | |
*/ | |
public Pair<K, V> setKey(final K key) { | |
this.key = key; | |
return this; | |
} | |
/** | |
* @return value | |
*/ | |
public V getValue() { | |
return value; | |
} | |
/** | |
* @param value value to be set | |
* @return this | |
*/ | |
public Pair<K, V> setValue(final V value) { | |
this.value = value; | |
return this; | |
} | |
public String toString() { | |
return OPEN_BRACE + key + COMMA + value + CLOSE_BRACE; | |
} | |
/** | |
* @return {key,val} as string | |
*/ | |
public String toTuple() { | |
return OPEN_BRACE + key + COMMA + value + CLOSE_BRACE; | |
} | |
public static void main(String args[]) { | |
System.out.println(new Pair<String, Integer>().setPair("Susan Boyle", 1).toString()); | |
System.out.println(new Pair<String, Integer>().setKey("Susan Boyle").setValue(1).toString()); | |
System.out.println(new Pair<String, Integer>("Susan Boyle", 1).toString()); | |
} | |
/** | |
* Matches checked only on key | |
* | |
* @param o | |
* @return | |
*/ | |
@Override | |
public boolean equals(Object o) { | |
if (this == o) return true; | |
if (o == null || getClass() != o.getClass()) return false; | |
Pair pair = (Pair) o; | |
if (key != null ? !key.equals(pair.key) : pair.key != null) return false; | |
return true; | |
} | |
@Override | |
public int hashCode() { | |
return key != null ? key.hashCode() : 0; | |
} | |
} |
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