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-rw-r--r--linguistics/src/main/java/com/yahoo/language/process/Stemmer.java26
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diff --git a/linguistics/src/main/java/com/yahoo/language/process/Stemmer.java b/linguistics/src/main/java/com/yahoo/language/process/Stemmer.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.language.process;
+
+import com.yahoo.language.Language;
+
+import java.util.List;
+
+/**
+ * <p>Interface providing stemming of single words.</p>
+ *
+ * @author <a href="mailto:mathiasm@yahoo-inc.com">Mathias Mølster Lidal</a>
+ */
+public interface Stemmer {
+
+ /**
+ * Stem input according to specified stemming mode.
+ *
+ * @param input the string to stem.
+ * @param mode the stemming mode
+ * @param language the language to use for stemming
+ * @return list of possible stems. Empty if none.
+ * @throws ProcessingException thrown if there is an exception stemming this input
+ */
+ List<StemList> stem(String input, StemMode mode, Language language);
+
+}