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54 lines
1.4 KiB
54 lines
1.4 KiB
package com.porcupine.util;
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import java.util.LinkedHashMap;
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/**
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* Varargs parser<br>
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* Converts an array of repeated "key, value" pairs to a LinkedHashMap.<br>
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* example:
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*
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* <pre>
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*
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* Object[] array = { "one", 1, "two", 4, "three", 9, "four", 16 };
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* Map<String, Integer> args = new VarargsParser<String, Integer>().parse(array);
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* </pre>
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*
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* @author Ondřej Hruška (MightyPork)
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* @param <K> Type for Map keys
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* @param <V> Type for Map values
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*/
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public class VarargsParser<K, V> {
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/**
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* Parse array of vararg key, value pairs to a LinkedHashMap.
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*
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* @param args varargs
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* @return LinkedHashMap
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* @throws ClassCastException in case of incompatible type in the array
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* @throws IllegalArgumentException in case of invalid array length (odd)
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*/
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@SuppressWarnings("unchecked")
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public LinkedHashMap<K, V> parse(Object... args) throws ClassCastException, IllegalArgumentException
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{
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LinkedHashMap<K, V> attrs = new LinkedHashMap<K, V>();
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if (args.length % 2 != 0) {
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throw new IllegalArgumentException("Odd number of elements in varargs map!");
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}
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K key = null;
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for (Object o : args) {
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if (key == null) {
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if (o == null) throw new RuntimeException("Key cannot be NULL in varargs map.");
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key = (K) o;
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} else {
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attrs.put(key, (V) o);
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key = null;
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}
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}
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return attrs;
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}
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}
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