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Merge pull request #5 from Workday/remove-guava
Remove dependency on guava
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58 changes: 58 additions & 0 deletions
58
postman/src/main/java/com/workday/postman/util/CollectionUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package com.workday.postman.util; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.HashSet; | ||
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| /** | ||
| * Some stuff copied from Google's guava library. | ||
| * | ||
| * @author Nathan Taylor | ||
| * @since 2015-08-04 | ||
| */ | ||
| public class CollectionUtils { | ||
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| /** | ||
| * The largest power of two that can be represented as an {@code int}. | ||
| * | ||
| * @since 10.0 | ||
| */ | ||
| public static final int MAX_POWER_OF_TWO = 1 << (Integer.SIZE - 2); | ||
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| public static <E> ArrayList<E> newArrayList(E... elements) { | ||
| Preconditions.checkNotNull(elements, "elements"); | ||
| ArrayList<E> list = new ArrayList<>(elements.length); | ||
| Collections.addAll(list, elements); | ||
| return list; | ||
| } | ||
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| @SafeVarargs | ||
| public static <E> HashSet<E> newHashSet(E... elements) { | ||
| Preconditions.checkNotNull(elements, "elements"); | ||
| HashSet<E> set = newHashSetWithExpectedSize(elements.length); | ||
| Collections.addAll(set, elements); | ||
| return set; | ||
| } | ||
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| private static <E> HashSet<E> newHashSetWithExpectedSize(int expectedSize) { | ||
| return new HashSet<>(mapCapacity(expectedSize)); | ||
| } | ||
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| /** | ||
| * Returns a capacity that is sufficient to keep the map from being resized as | ||
| * long as it grows no larger than expectedSize and the load factor is >= its | ||
| * default (0.75). | ||
| */ | ||
| static int mapCapacity(int expectedSize) { | ||
| if (expectedSize < 3) { | ||
| Preconditions.checkArgument(expectedSize >= 0, | ||
| "Size must be nonnegative but was " + expectedSize); | ||
| return expectedSize + 1; | ||
| } | ||
| if (expectedSize < MAX_POWER_OF_TWO) { | ||
| return expectedSize + expectedSize / 3; | ||
| } | ||
| return Integer.MAX_VALUE; // any large value | ||
| } | ||
| } |
26 changes: 26 additions & 0 deletions
26
postman/src/main/java/com/workday/postman/util/Preconditions.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package com.workday.postman.util; | ||
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| /** | ||
| * @author Nathan Taylor | ||
| * @since 2015-08-04 | ||
| */ | ||
| public class Preconditions { | ||
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| public static void checkState(boolean expression, String message) { | ||
| if (!expression) { | ||
| throw new IllegalStateException(message); | ||
| } | ||
| } | ||
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| public static void checkArgument(boolean expression, String message) { | ||
| if (!expression) { | ||
| throw new IllegalArgumentException(message); | ||
| } | ||
| } | ||
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| public static void checkNotNull(Object reference, String message) { | ||
| if (reference == null) { | ||
| throw new NullPointerException(message); | ||
| } | ||
| } | ||
| } |