From 54b3f906ff4cb24e0deb3714a1c31a832abe1b5d Mon Sep 17 00:00:00 2001
From: Erik Brakkee <erik@brakkee.org>
Date: Sun, 13 Apr 2008 08:23:33 +0000
Subject: [PATCH] filtering of collections.

---
 .../wamblee/collections/CollectionFilter.java | 32 ++++++++++++++
 .../collections/CollectionFilterTest.java     | 42 +++++++++++++++++++
 .../java/org/wamblee/test/AssertionUtils.java | 20 +++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 support/general/src/main/java/org/wamblee/collections/CollectionFilter.java
 create mode 100644 support/general/src/test/java/org/wamblee/collections/CollectionFilterTest.java

diff --git a/support/general/src/main/java/org/wamblee/collections/CollectionFilter.java b/support/general/src/main/java/org/wamblee/collections/CollectionFilter.java
new file mode 100644
index 00000000..c52bf7b1
--- /dev/null
+++ b/support/general/src/main/java/org/wamblee/collections/CollectionFilter.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ 
+package org.wamblee.collections;
+
+import java.util.Collection;
+
+import org.wamblee.conditions.Condition;
+
+public class CollectionFilter {
+
+	public static <T> void filter(Collection<T> aFrom, Collection<T> aTo, Condition<T> aCondition) { 
+		for (T t: aFrom) { 
+			if ( aCondition.matches(t)) { 
+				aTo.add(t);
+			}
+		}
+	}
+	
+}
diff --git a/support/general/src/test/java/org/wamblee/collections/CollectionFilterTest.java b/support/general/src/test/java/org/wamblee/collections/CollectionFilterTest.java
new file mode 100644
index 00000000..1e56eac1
--- /dev/null
+++ b/support/general/src/test/java/org/wamblee/collections/CollectionFilterTest.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2008 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */ 
+package org.wamblee.collections;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.wamblee.conditions.Condition;
+import org.wamblee.test.AssertionUtils;
+
+import junit.framework.TestCase;
+
+public class CollectionFilterTest extends TestCase {
+	
+	public void testFilter() { 
+		List<String> list = Arrays.asList(new String[] { "x", "y", "z", "y" }); 
+		List<String> result = new ArrayList<String>();
+		CollectionFilter.filter(list, result, 
+				new Condition<String>() { 
+			@Override
+			public boolean matches(String aObject) {
+				return aObject.equals("y");
+			}
+		});
+		AssertionUtils.assertEquals(new String[] { "y", "y" }, result.toArray());
+	}
+
+}
diff --git a/support/general/src/test/java/org/wamblee/test/AssertionUtils.java b/support/general/src/test/java/org/wamblee/test/AssertionUtils.java
index 8d179db7..fc404072 100644
--- a/support/general/src/test/java/org/wamblee/test/AssertionUtils.java
+++ b/support/general/src/test/java/org/wamblee/test/AssertionUtils.java
@@ -16,6 +16,7 @@
 package org.wamblee.test;
 
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -35,6 +36,25 @@ public final class AssertionUtils {
     private AssertionUtils() {
         // Empty
     }
+    
+    /**
+     * Asserts that two collections are equal including equality of the elements. 
+     * @param aExpected
+     * @param aActual
+     */
+    public static void assertEquals(List aExpected, List aActual) { 
+    	assertEquals(aExpected.toArray(), aActual.toArray());
+    }
+    
+    /**
+     * Asserts that two collections are equal including equality of the elements. 
+     * @param aMsg
+     * @param aExpected
+     * @param aActual
+     */
+    public static void assertEquals(String aMsg, List aExpected, List aActual) { 
+    	assertEquals(aMsg, aExpected.toArray(), aActual.toArray());
+    }
 
     /**
      * Asserts that two object arrays are equal.
-- 
2.31.1