pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / document / MapFieldSelector.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/document/MapFieldSelector.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/document/MapFieldSelector.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/document/MapFieldSelector.java
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+package org.apache.lucene.document;
+
+/**
+ * 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 java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A {@link FieldSelector} based on a Map of field names to {@link FieldSelectorResult}s
+ *
+ */
+public class MapFieldSelector implements FieldSelector {
+    
+    Map<String,FieldSelectorResult> fieldSelections;
+    
+    /** Create a a MapFieldSelector
+     * @param fieldSelections maps from field names (String) to {@link FieldSelectorResult}s
+     */
+    public MapFieldSelector(Map<String,FieldSelectorResult> fieldSelections) {
+        this.fieldSelections = fieldSelections;
+    }
+    
+    /** Create a a MapFieldSelector
+     * @param fields fields to LOAD.  List of Strings.  All other fields are NO_LOAD.
+     */
+    public MapFieldSelector(List<String> fields) {
+        fieldSelections = new HashMap<String,FieldSelectorResult>(fields.size()*5/3);
+        for (final String field : fields)
+            fieldSelections.put(field, FieldSelectorResult.LOAD);
+    }
+    
+    /** Create a a MapFieldSelector
+     * @param fields fields to LOAD.  All other fields are NO_LOAD.
+     */
+    public MapFieldSelector(String... fields) {
+      this(Arrays.asList(fields));
+    }
+
+
+    
+    /** Load field according to its associated value in fieldSelections
+     * @param field a field name
+     * @return the fieldSelections value that field maps to or NO_LOAD if none.
+     */
+    public FieldSelectorResult accept(String field) {
+        FieldSelectorResult selection = fieldSelections.get(field);
+        return selection!=null ? selection : FieldSelectorResult.NO_LOAD;
+    }
+    
+}