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feat: move collection creation methods to CollectionTool
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105 changes: 105 additions & 0 deletions
105
testable-core/src/main/java/com/alibaba/testable/core/tool/CollectionTool.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package com.alibaba.testable.core.tool; | ||
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| import java.lang.reflect.Array; | ||
| import java.util.*; | ||
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| public class CollectionTool { | ||
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| /** | ||
| * Get slice of args[startPos, args.length] | ||
| * @param args original item array | ||
| * @param startPos index of the first item to keep | ||
| * @return a new array with sliced items | ||
| */ | ||
| public static <T> T[] slice(T[] args, int startPos) { | ||
| return slice(args, startPos, args.length - 1); | ||
| } | ||
|
|
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| /** | ||
| * Get slice of args[startPos, endPos] | ||
| * @param args original item array | ||
| * @param startPos index of the first item to keep | ||
| * @param endPos index of the last item to keep | ||
| * @return a new array with sliced items | ||
| */ | ||
| public static <T> T[] slice(T[] args, int startPos, int endPos) { | ||
| int size = endPos - startPos + 1; | ||
| if (size <= 0) { | ||
| return (T[]) Array.newInstance(args.getClass().getComponentType(), 0); | ||
| } | ||
| T[] slicedArgs = (T[])Array.newInstance(args.getClass().getComponentType(), size); | ||
| System.arraycopy(args, startPos, slicedArgs, 0, size); | ||
| return slicedArgs; | ||
| } | ||
|
|
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| /** | ||
| * Create an array | ||
| * @param items elements to add | ||
| * @return array of the provided items | ||
| */ | ||
| public static <T> T[] arrayOf(T... items) { | ||
| return items; | ||
| } | ||
|
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| /** | ||
| * Create an immutable list | ||
| * @param items elements to add | ||
| * @return list of the provided items | ||
| */ | ||
| public static <T> List<T> fastListOf(T... items) { | ||
| return Arrays.asList(items); | ||
| } | ||
|
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| /** | ||
| * Create a mutable list | ||
| * @param items elements to add | ||
| * @return list of the provided items | ||
| */ | ||
| public static <T> List<T> listOf(T... items) { | ||
| return new ArrayList<T>(Arrays.asList(items)); | ||
| } | ||
|
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| /** | ||
| * Create a mutable set | ||
| * @param items elements to add | ||
| * @return set of the provided items | ||
| */ | ||
| public static <T> Set<T> setOf(T... items) { | ||
| return new HashSet<T>(Arrays.asList(items)); | ||
| } | ||
|
|
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| /** | ||
| * Create a mutable map | ||
| * @param entry elements to add | ||
| * @return map of the provided items | ||
| */ | ||
| public static <K, V> Map<K, V> mapOf(Map.Entry<K, V>... entry) { | ||
| return appendMap(new HashMap<K, V>(entry.length), entry); | ||
| } | ||
|
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| /** | ||
| * Create an mutable ordered map | ||
| * @param entry elements to add | ||
| * @return ordered map of the provided items | ||
| */ | ||
| public static <K, V> Map<K, V> orderedMapOf(Map.Entry<K, V>... entry) { | ||
| return appendMap(new LinkedHashMap<K, V>(entry.length), entry); | ||
| } | ||
|
|
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| /** | ||
| * Create a map entry | ||
| * @param key the key | ||
| * @param value the value | ||
| * @return entry of provided key and value | ||
| */ | ||
| public static <K, V> Map.Entry<K, V> entryOf(K key, V value) { | ||
| return new AbstractMap.SimpleEntry<K, V>(key, value); | ||
| } | ||
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| private static <K, V> Map<K, V> appendMap(Map<K, V> kvs, Map.Entry<K, V>[] entry) { | ||
| for (Map.Entry<K, V> p : entry) { | ||
| kvs.put(p.getKey(), p.getValue()); | ||
| } | ||
| return kvs; | ||
| } | ||
| } |
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