39 lines
1.1 KiB
Java
39 lines
1.1 KiB
Java
package net.abhinavsarkar.spelhelper;
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import static java.util.Collections.unmodifiableList;
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import static java.util.Collections.unmodifiableMap;
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import static java.util.Collections.unmodifiableSet;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.springframework.util.Assert;
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final class ExtensionFunctions {
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public static <T> List<T> list(final T... args) {
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return unmodifiableList(Arrays.asList(args));
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}
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public static <T> Set<T> set(final T... args) {
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return unmodifiableSet(new HashSet<T>(list(args)));
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}
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public static <K,V> Map<K,V> map(final List<? extends K> keys,
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final List<? extends V> values) {
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Assert.isTrue(keys.size() == values.size(),
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"There should equal number of keys and values");
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Map<K,V> map = new HashMap<K,V>();
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int length = keys.size();
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for (int i = 0; i < length; i++) {
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map.put(keys.get(i), values.get(i));
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}
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return unmodifiableMap(map);
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}
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}
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