PR: COLLECTIONS-323

Submitted-By: Maarten Brak <maarten.brak@quinity.com>
Allow to use an initial capacity of 0 on certain maps.


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1079602 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

@@ -129,11 +129,14 @@
       <name>Janek Bogucki</name>
     </contributor>
     <contributor>
-      <name>Chuck Burdick</name>
+      <name>Maarten Brak</name>
     </contributor>
     <contributor>
       <name>Dave Bryson</name>
     </contributor>
+    <contributor>
+      <name>Chuck Burdick</name>
+    </contributor>
     <contributor>
       <name>Julien Buret</name>
     </contributor>

src/java/org/apache/commons/collections/map/AbstractHashedMap.java

@@ -124,7 +124,7 @@ public class AbstractHashedMap<K, V> extends AbstractMap<K, V> implements Iterab
      * default load factor.
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     protected AbstractHashedMap(int initialCapacity) {
         this(initialCapacity, DEFAULT_LOAD_FACTOR);
@@ -136,14 +136,14 @@ public class AbstractHashedMap<K, V> extends AbstractMap<K, V> implements Iterab
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IlleagalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than or equal to zero 
      */
     @SuppressWarnings("unchecked")
     protected AbstractHashedMap(int initialCapacity, float loadFactor) {
         super();
-        if (initialCapacity < 1) {
-            throw new IllegalArgumentException("Initial capacity must be greater than 0");
+        if (initialCapacity < 0) {
+            throw new IllegalArgumentException("Initial capacity must be a non negative number");  
         }
         if (loadFactor <= 0.0f || Float.isNaN(loadFactor)) {
             throw new IllegalArgumentException("Load factor must be greater than 0");

src/java/org/apache/commons/collections/map/AbstractLinkedMap.java

@@ -89,7 +89,7 @@ public abstract class AbstractLinkedMap<K, V> extends AbstractHashedMap<K, V> im
      * Constructs a new, empty map with the specified initial capacity. 
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     protected AbstractLinkedMap(int initialCapacity) {
         super(initialCapacity);
@@ -101,7 +101,7 @@ public abstract class AbstractLinkedMap<K, V> extends AbstractHashedMap<K, V> im
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than zero
      */
     protected AbstractLinkedMap(int initialCapacity, float loadFactor) {

src/java/org/apache/commons/collections/map/CaseInsensitiveMap.java

@@ -78,7 +78,7 @@ public class CaseInsensitiveMap<K, V> extends AbstractHashedMap<K, V> implements
      * Constructs a new, empty map with the specified initial capacity. 
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     public CaseInsensitiveMap(int initialCapacity) {
         super(initialCapacity);
@@ -90,7 +90,7 @@ public class CaseInsensitiveMap<K, V> extends AbstractHashedMap<K, V> implements
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than zero
      */
     public CaseInsensitiveMap(int initialCapacity, float loadFactor) {

src/java/org/apache/commons/collections/map/HashedMap.java

@@ -58,7 +58,7 @@ public class HashedMap<K, V>
      * Constructs a new, empty map with the specified initial capacity.
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     public HashedMap(int initialCapacity) {
         super(initialCapacity);
@@ -70,7 +70,7 @@ public class HashedMap<K, V>
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than zero
      */
     public HashedMap(int initialCapacity, float loadFactor) {

src/java/org/apache/commons/collections/map/IdentityMap.java

@@ -60,7 +60,7 @@ public class IdentityMap<K, V>
      * Constructs a new, empty map with the specified initial capacity.
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     public IdentityMap(int initialCapacity) {
         super(initialCapacity);
@@ -72,7 +72,7 @@ public class IdentityMap<K, V>
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than zero
      */
     public IdentityMap(int initialCapacity, float loadFactor) {

src/java/org/apache/commons/collections/map/LinkedMap.java

@@ -78,7 +78,7 @@ public class LinkedMap<K, V> extends AbstractLinkedMap<K, V> implements Serializ
      * Constructs a new, empty map with the specified initial capacity. 
      *
      * @param initialCapacity  the initial capacity
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      */
     public LinkedMap(int initialCapacity) {
         super(initialCapacity);
@@ -90,7 +90,7 @@ public class LinkedMap<K, V> extends AbstractLinkedMap<K, V> implements Serializ
      *
      * @param initialCapacity  the initial capacity
      * @param loadFactor  the load factor
-     * @throws IllegalArgumentException if the initial capacity is less than one
+     * @throws IllegalArgumentException if the initial capacity is negative
      * @throws IllegalArgumentException if the load factor is less than zero
      */
     public LinkedMap(int initialCapacity, float loadFactor) {

src/test/org/apache/commons/collections/map/TestCaseInsensitiveMap.java

@@ -146,4 +146,11 @@ public class TestCaseInsensitiveMap<K, V> extends AbstractTestIterableMap<K, V>
         }
     }
 
+    /**
+     * Test for <a href="https://issues.apache.org/jira/browse/COLLECTIONS-323">COLLECTIONS-323</a>.
+     */
+    public void testInitialCapacityZero() {
+        final CaseInsensitiveMap<String,String> map = new CaseInsensitiveMap<String,String>(0);
+        assertEquals(1, map.data.length);
+    }
 }

src/test/org/apache/commons/collections/map/TestHashedMap.java

@@ -70,4 +70,12 @@ public class TestHashedMap<K, V> extends AbstractTestIterableMap<K, V> {
 //        resetFull();
 //        writeExternalFormToDisk((java.io.Serializable) map, "D:/dev/collections/data/test/HashedMap.fullCollection.version3.obj");
 //    }
+
+    /**
+     * Test for <a href="https://issues.apache.org/jira/browse/COLLECTIONS-323">COLLECTIONS-323</a>.
+     */
+    public void testInitialCapacityZero() {
+        final HashedMap<String,String> map = new HashedMap<String,String>(0);
+        assertEquals(1, map.data.length);
+    }
 }

src/test/org/apache/commons/collections/map/TestIdentityMap.java

@@ -143,4 +143,12 @@ public class TestIdentityMap<K, V> extends AbstractTestObject {
 //        map.put(I2A, I2B);
 //        writeExternalFormToDisk((java.io.Serializable) map, "D:/dev/collections/data/test/IdentityMap.fullCollection.version3.obj");
 //    }
+
+    /**
+     * Test for <a href="https://issues.apache.org/jira/browse/COLLECTIONS-323">COLLECTIONS-323</a>.
+     */
+    public void testInitialCapacityZero() {
+        final IdentityMap<String,String> map = new IdentityMap<String,String>(0);
+        assertEquals(1, map.data.length);
+    }
 }

src/test/org/apache/commons/collections/map/TestLinkedMap.java

@@ -295,4 +295,12 @@ public class TestLinkedMap<K, V> extends AbstractTestOrderedMap<K, V> {
     public LinkedMap<K, V> getMap() {
         return (LinkedMap<K, V>) super.getMap();
     }
+
+    /**
+     * Test for <a href="https://issues.apache.org/jira/browse/COLLECTIONS-323">COLLECTIONS-323</a>.
+     */
+    public void testInitialCapacityZero() {
+        final LinkedMap<String,String> map = new LinkedMap<String,String>(0);
+        assertEquals(1, map.data.length);
+    }
 }