Keep word filter through an error if `keep_word_path` was specified.

Closes #4073

src/main/java/org/elasticsearch/index/analysis/KeepWordFilterFactory.java

@@ -17,14 +17,11 @@ package org.elasticsearch.index.analysis;
  * specific language governing permissions and limitations
  * under the License.
  */
-import org.apache.lucene.util.Version;
-
-import java.util.Arrays;
-import java.util.Map;
 
 import org.apache.lucene.analysis.TokenStream;
 import org.apache.lucene.analysis.miscellaneous.KeepWordFilter;
 import org.apache.lucene.analysis.util.CharArraySet;
+import org.apache.lucene.util.Version;
 import org.elasticsearch.ElasticSearchIllegalArgumentException;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.inject.assistedinject.Assisted;
@@ -32,33 +29,31 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.index.Index;
 import org.elasticsearch.index.settings.IndexSettings;
-import org.elasticsearch.indices.analysis.IndicesAnalysisService;
 
 /**
  * A {@link TokenFilterFactory} for {@link KeepWordFilter}. This filter only
  * keep tokens that are contained in the term set configured via
  * {@value #KEEP_WORDS_KEY} setting. This filter acts like an inverse stop
  * filter.
- * 
+ * <p/>
  * Configuration options:
- * 
+ * <p/>
  * <ul>
  * <li>{@value #KEEP_WORDS_KEY} the array of words / tokens to keep.</li>
- * 
+ * <p/>
  * <li>{@value #KEEP_WORDS_PATH_KEY} an reference to a file containing the words
  * / tokens to keep. Note: this is an alternative to {@value #KEEP_WORDS_KEY} if
  * both are set an exception will be thrown.</li>
- * 
+ * <p/>
  * <li>{@value #ENABLE_POS_INC_KEY} <code>true</code> iff the filter should
  * maintain position increments for dropped tokens. The default is
  * <code>true</code>.</li>
- * 
+ * <p/>
  * <li>{@value #KEEP_WORDS_CASE_KEY} to use case sensitive keep words. The
  * default is <code>false</code> which corresponds to case-sensitive.</li>
  * </ul>
  *
  * @see StopTokenFilterFactory
- * 
  */
 @AnalysisSettingsRequired
 public class KeepWordFilterFactory extends AbstractTokenFilterFactory {
@@ -71,19 +66,18 @@ public class KeepWordFilterFactory extends AbstractTokenFilterFactory {
 
     @Inject
     public KeepWordFilterFactory(Index index, @IndexSettings Settings indexSettings,
-            Environment env, IndicesAnalysisService indicesAnalysisService, Map<String, TokenizerFactoryFactory> tokenizerFactories,
+                                 Environment env, @Assisted String name, @Assisted Settings settings) {
-                                     @Assisted String name, @Assisted Settings settings) {
         super(index, indexSettings, name, settings);
 
-        final String[] arrayKeepWords = settings.getAsArray(KEEP_WORDS_KEY);
+        final String[] arrayKeepWords = settings.getAsArray(KEEP_WORDS_KEY, null);
         final String keepWordsPath = settings.get(KEEP_WORDS_PATH_KEY, null);
-        if (!(arrayKeepWords == null ^ keepWordsPath == null)) {
+        if ((arrayKeepWords == null && keepWordsPath == null) || (arrayKeepWords != null && keepWordsPath != null)) {
-            // we don't allow both or non
+            // we don't allow both or none
             throw new ElasticSearchIllegalArgumentException("keep requires either `" + KEEP_WORDS_KEY + "` or `"
-                            + KEEP_WORDS_PATH_KEY + "` to be configured");
+                    + KEEP_WORDS_PATH_KEY + "` to be configured");
         }
         if (version.onOrAfter(Version.LUCENE_44) && settings.get(ENABLE_POS_INC_KEY) != null) {
-            throw new ElasticSearchIllegalArgumentException(ENABLE_POS_INC_KEY +  " is not supported anymore. Please fix your analysis chain or use"
+            throw new ElasticSearchIllegalArgumentException(ENABLE_POS_INC_KEY + " is not supported anymore. Please fix your analysis chain or use"
                     + " an older compatibility version (<=4.3) but beware that it might cause highlighting bugs.");
         }
         enablePositionIncrements = version.onOrAfter(Version.LUCENE_44) ? true : settings.getAsBoolean(ENABLE_POS_INC_KEY, true);
@@ -101,7 +95,4 @@ public class KeepWordFilterFactory extends AbstractTokenFilterFactory {
     }
 
 
-    
-   
-
 }

src/test/java/org/elasticsearch/index/analysis/KeepFilterFactoryTests.java

@@ -24,6 +24,7 @@ import org.apache.lucene.analysis.core.WhitespaceTokenizer;
 import org.elasticsearch.ElasticSearchIllegalArgumentException;
 import org.elasticsearch.common.settings.ImmutableSettings;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.env.FailedToResolveConfigException;
 import org.elasticsearch.test.ElasticsearchTokenStreamTestCase;
 import org.junit.Assert;
 import org.junit.Test;
@@ -48,10 +49,10 @@ public class KeepFilterFactoryTests extends ElasticsearchTokenStreamTestCase {
     @Test
     public void testLoadOverConfiguredSettings() {
         Settings settings = ImmutableSettings.settingsBuilder()
-        .put("index.analysis.filter.broken_keep_filter.type", "keep")
+                .put("index.analysis.filter.broken_keep_filter.type", "keep")
-        .put("index.analysis.filter.broken_keep_filter.keep_words_path", "does/not/exists.txt")
+                .put("index.analysis.filter.broken_keep_filter.keep_words_path", "does/not/exists.txt")
-        .put("index.analysis.filter.broken_keep_filter.keep_words", "[\"Hello\", \"worlD\"]")
+                .put("index.analysis.filter.broken_keep_filter.keep_words", "[\"Hello\", \"worlD\"]")
-        .build();
+                .build();
         try {
             AnalysisTestsHelper.createAnalysisServiceFromSettings(settings);
             Assert.fail("path and array are configured");
@@ -60,6 +61,33 @@ public class KeepFilterFactoryTests extends ElasticsearchTokenStreamTestCase {
         }
     }
 
+    @Test
+    public void testKeepWordsPathSettings() {
+        Settings settings = ImmutableSettings.settingsBuilder()
+                .put("index.analysis.filter.non_broken_keep_filter.type", "keep")
+                .put("index.analysis.filter.non_broken_keep_filter.keep_words_path", "does/not/exists.txt")
+                .build();
+        try {
+            // test our none existing setup is picked up
+            AnalysisTestsHelper.createAnalysisServiceFromSettings(settings);
+            fail("expected an exception due to non existent keep_words_path");
+        } catch (Throwable e) {
+            assertThat(e.getCause(), instanceOf(FailedToResolveConfigException.class));
+        }
+
+        settings = ImmutableSettings.settingsBuilder().put(settings)
+                .put("index.analysis.filter.non_broken_keep_filter.keep_words", new String[]{"test"})
+                .build();
+        try {
+            // test our none existing setup is picked up
+            AnalysisTestsHelper.createAnalysisServiceFromSettings(settings);
+            fail("expected an exception indicating that you can't use [keep_words_path] with [keep_words] ");
+        } catch (Throwable e) {
+            assertThat(e.getCause(), instanceOf(ElasticSearchIllegalArgumentException.class));
+        }
+
+    }
+
     @Test
     public void testCaseInsensitiveMapping() throws IOException {
         AnalysisService analysisService = AnalysisTestsHelper.createAnalysisServiceFromClassPath(RESOURCE);
@@ -68,7 +96,7 @@ public class KeepFilterFactoryTests extends ElasticsearchTokenStreamTestCase {
         String source = "hello small world";
         String[] expected = new String[]{"hello", "world"};
         Tokenizer tokenizer = new WhitespaceTokenizer(TEST_VERSION_CURRENT, new StringReader(source));
-        assertTokenStreamContents(tokenFilter.create(tokenizer), expected, new int[] {1,2});
+        assertTokenStreamContents(tokenFilter.create(tokenizer), expected, new int[]{1, 2});
     }
 
     @Test
@@ -79,7 +107,7 @@ public class KeepFilterFactoryTests extends ElasticsearchTokenStreamTestCase {
         String source = "Hello small world";
         String[] expected = new String[]{"Hello"};
         Tokenizer tokenizer = new WhitespaceTokenizer(TEST_VERSION_CURRENT, new StringReader(source));
-        assertTokenStreamContents(tokenFilter.create(tokenizer), expected, new int[] {1});
+        assertTokenStreamContents(tokenFilter.create(tokenizer), expected, new int[]{1});
     }
 
 }