pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / analyzers / common / src / test / org / apache / lucene / analysis / ngram / NGramTokenFilterTest.java

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/test/org/apache/lucene/analysis/ngram/NGramTokenFilterTest.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/test/org/apache/lucene/analysis/ngram/NGramTokenFilterTest.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/test/org/apache/lucene/analysis/ngram/NGramTokenFilterTest.java
@@ -0,0 +1,96 @@
+package org.apache.lucene.analysis.ngram;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file 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.
+ */
+
+import org.apache.lucene.analysis.MockTokenizer;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.WhitespaceTokenizer;
+import org.apache.lucene.analysis.BaseTokenStreamTestCase;
+
+import java.io.StringReader;
+
+/**
+ * Tests {@link NGramTokenFilter} for correctness.
+ */
+public class NGramTokenFilterTest extends BaseTokenStreamTestCase {
+    private TokenStream input;
+    
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        input = new MockTokenizer(new StringReader("abcde"), MockTokenizer.WHITESPACE, false);
+    }
+
+    public void testInvalidInput() throws Exception {
+        boolean gotException = false;
+        try {        
+            new NGramTokenFilter(input, 2, 1);
+        } catch (IllegalArgumentException e) {
+            gotException = true;
+        }
+        assertTrue(gotException);
+    }
+
+    public void testInvalidInput2() throws Exception {
+        boolean gotException = false;
+        try {        
+            new NGramTokenFilter(input, 0, 1);
+        } catch (IllegalArgumentException e) {
+            gotException = true;
+        }
+        assertTrue(gotException);
+    }
+
+    public void testUnigrams() throws Exception {
+      NGramTokenFilter filter = new NGramTokenFilter(input, 1, 1);
+      assertTokenStreamContents(filter, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5});
+    }
+
+    public void testBigrams() throws Exception {
+      NGramTokenFilter filter = new NGramTokenFilter(input, 2, 2);
+      assertTokenStreamContents(filter, new String[]{"ab","bc","cd","de"}, new int[]{0,1,2,3}, new int[]{2,3,4,5});
+    }
+
+    public void testNgrams() throws Exception {
+      NGramTokenFilter filter = new NGramTokenFilter(input, 1, 3);
+      assertTokenStreamContents(filter,
+        new String[]{"a","b","c","d","e", "ab","bc","cd","de", "abc","bcd","cde"}, 
+        new int[]{0,1,2,3,4, 0,1,2,3, 0,1,2},
+        new int[]{1,2,3,4,5, 2,3,4,5, 3,4,5}
+      );
+    }
+
+    public void testOversizedNgrams() throws Exception {
+      NGramTokenFilter filter = new NGramTokenFilter(input, 6, 7);
+      assertTokenStreamContents(filter, new String[0], new int[0], new int[0]);
+    }
+    
+    public void testSmallTokenInStream() throws Exception {
+      input = new MockTokenizer(new StringReader("abc de fgh"), MockTokenizer.WHITESPACE, false);
+      NGramTokenFilter filter = new NGramTokenFilter(input, 3, 3);
+      assertTokenStreamContents(filter, new String[]{"abc","fgh"}, new int[]{0,7}, new int[]{3,10});
+    }
+    
+    public void testReset() throws Exception {
+      WhitespaceTokenizer tokenizer = new WhitespaceTokenizer(TEST_VERSION_CURRENT, new StringReader("abcde"));
+      NGramTokenFilter filter = new NGramTokenFilter(tokenizer, 1, 1);
+      assertTokenStreamContents(filter, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5});
+      tokenizer.reset(new StringReader("abcde"));
+      assertTokenStreamContents(filter, new String[]{"a","b","c","d","e"}, new int[]{0,1,2,3,4}, new int[]{1,2,3,4,5});
+    }
+}