SF.net SVN: xmlunit:[384] trunk/xmlunit/src

[<bo...@us...>]

Revision: 384
          http://xmlunit.svn.sourceforge.net/xmlunit/?rev=384&view=rev
Author:   bodewig
Date:     2010-05-07 16:14:55 +0000 (Fri, 07 May 2010)

Log Message:
-----------
listener management

Added Paths:
-----------
    trunk/xmlunit/src/main/java-core/net/sf/xmlunit/diff/ComparisonListenerSupport.java
    trunk/xmlunit/src/tests/java-core/net/sf/xmlunit/diff/ComparisonListenerSupportTest.java

Added: trunk/xmlunit/src/main/java-core/net/sf/xmlunit/diff/ComparisonListenerSupport.java
===================================================================
--- trunk/xmlunit/src/main/java-core/net/sf/xmlunit/diff/ComparisonListenerSupport.java	                        (rev 0)
+++ trunk/xmlunit/src/main/java-core/net/sf/xmlunit/diff/ComparisonListenerSupport.java	2010-05-07 16:14:55 UTC (rev 384)
@@ -0,0 +1,78 @@
+/*
+  This file is licensed to You 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 net.sf.xmlunit.diff;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/**
+ * Encapsulates support for DifferenceListeners so it can be reused by
+ * different implementations of IDifferenceEngine.
+ */
+public class ComparisonListenerSupport {
+    private final List<ComparisonListener> compListeners =
+        new CopyOnWriteArrayList<ComparisonListener>();
+    private final List<ComparisonListener> matchListeners =
+        new CopyOnWriteArrayList<ComparisonListener>();
+    private final List<ComparisonListener> diffListeners =
+        new CopyOnWriteArrayList<ComparisonListener>();
+
+    /**
+     * Registers a listener that is notified of each comparison.
+     */
+    public void addComparisonListener(ComparisonListener l) {
+        compListeners.add(l);
+    }
+
+    /**
+     * Registers a listener that is notified of each comparison with
+     * outcome {@link ComparisonResult#EQUAL}.
+     */
+    public void addMatchListener(ComparisonListener l) {
+        matchListeners.add(l);
+    }
+
+    /**
+     * Registers a listener that is notified of each comparison with
+     * outcome other than {@link ComparisonResult#EQUAL}.
+     */
+    public void addDifferenceListener(ComparisonListener l) {
+        diffListeners.add(l);
+    }
+
+    /**
+     * Propagates the result of a comparision to all registered
+     * listeners.
+     */
+    public void fireComparisonPerformed(Comparison comparison,
+                                        ComparisonResult outcome) {
+        fire(comparison, outcome, compListeners);
+        if (outcome == ComparisonResult.EQUAL) {
+            fire(comparison, outcome, matchListeners);
+        } else {
+            fire(comparison, outcome, diffListeners);
+        }
+    }
+
+    private static void fire(Comparison comparison, ComparisonResult outcome,
+                             List<ComparisonListener> listeners) {
+        if (!listeners.isEmpty()) {
+            for (Iterator<ComparisonListener> it = listeners.iterator();
+                 it.hasNext(); ) {
+                it.next().comparisonPerformed(comparison, outcome);
+            }
+        }
+    }
+}


Property changes on: trunk/xmlunit/src/main/java-core/net/sf/xmlunit/diff/ComparisonListenerSupport.java
___________________________________________________________________
Added: svn:eol-style
   + native

Added: trunk/xmlunit/src/tests/java-core/net/sf/xmlunit/diff/ComparisonListenerSupportTest.java
===================================================================
--- trunk/xmlunit/src/tests/java-core/net/sf/xmlunit/diff/ComparisonListenerSupportTest.java	                        (rev 0)
+++ trunk/xmlunit/src/tests/java-core/net/sf/xmlunit/diff/ComparisonListenerSupportTest.java	2010-05-07 16:14:55 UTC (rev 384)
@@ -0,0 +1,71 @@
+/*
+  This file is licensed to You 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 net.sf.xmlunit.diff;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class ComparisonListenerSupportTest {
+
+    @Test public void dispatchesOnOutcome() {
+        ComparisonListenerSupport s = new ComparisonListenerSupport();
+        Listener c, m, d;
+        s.addComparisonListener(c = new Listener(ComparisonResult.EQUAL,
+                                                 ComparisonResult.SIMILAR,
+                                                 ComparisonResult.DIFFERENT,
+                                                 ComparisonResult.CRITICAL));
+        s.addMatchListener(m = new Listener(ComparisonResult.EQUAL));
+        s.addDifferenceListener(d = new Listener(ComparisonResult.SIMILAR,
+                                                 ComparisonResult.DIFFERENT,
+                                                 ComparisonResult.CRITICAL));
+        for (ComparisonResult r : new ComparisonResult[] {
+                ComparisonResult.EQUAL,
+                ComparisonResult.SIMILAR,
+                ComparisonResult.DIFFERENT,
+                ComparisonResult.CRITICAL
+            }) {
+            s.fireComparisonPerformed(null, r);
+        }
+
+        assertEquals(4, c.invocations);
+        assertEquals(1, m.invocations);
+        assertEquals(3, d.invocations);
+    }
+
+    @Test public void noListenersDontCauseProblems() {
+        ComparisonListenerSupport s = new ComparisonListenerSupport();
+        s.fireComparisonPerformed(null, ComparisonResult.EQUAL);
+    }
+
+    private static class Listener implements ComparisonListener {
+        private final HashSet<ComparisonResult> acceptable =
+            new HashSet<ComparisonResult>();
+        private int invocations = 0;
+
+        private Listener(ComparisonResult... accept) {
+            acceptable.addAll(Arrays.asList(accept));
+        }
+
+        public void comparisonPerformed(Comparison comparison,
+                                        ComparisonResult outcome) {
+            invocations++;
+            if (!acceptable.contains(outcome)) {
+                fail("unexpected outcome: " + outcome);
+            }
+        }
+    }
+}


Property changes on: trunk/xmlunit/src/tests/java-core/net/sf/xmlunit/diff/ComparisonListenerSupportTest.java
___________________________________________________________________
Added: svn:eol-style
   + native


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