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package org.apache.solr.analysis;
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import org.apache.lucene.analysis.TokenStream;
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import org.apache.lucene.analysis.synonym.SynonymFilter;
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import org.apache.lucene.util.Version;
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import org.apache.solr.common.ResourceLoader;
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import org.apache.solr.util.plugin.ResourceLoaderAware;
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* Factory for {@link SynonymFilter}.
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* <pre class="prettyprint" >
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* <fieldType name="text_synonym" class="solr.TextField" positionIncrementGap="100">
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* <tokenizer class="solr.WhitespaceTokenizerFactory"/>
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* <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt"
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* format="solr" ignoreCase="false" expand="true"
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* tokenizerFactory="solr.WhitespaceTokenizerFactory"/>
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* </fieldType></pre>
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public class SynonymFilterFactory extends BaseTokenFilterFactory implements ResourceLoaderAware {
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private BaseTokenFilterFactory delegator;
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public void init(Map<String,String> args) {
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if (luceneMatchVersion.onOrAfter(Version.LUCENE_34)) {
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delegator = new FSTSynonymFilterFactory();
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// check if you use the new optional arg "format". this makes no sense for the old one,
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// as its wired to solr's synonyms format only.
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if (args.containsKey("format") && !args.get("format").equals("solr")) {
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throw new IllegalArgumentException("You must specify luceneMatchVersion >= 3.4 to use alternate synonyms formats");
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delegator = new SlowSynonymFilterFactory();
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public TokenStream create(TokenStream input) {
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assert delegator != null : "init() was not called!";
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return delegator.create(input);
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public void inform(ResourceLoader loader) {
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assert delegator != null : "init() was not called!";
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((ResourceLoaderAware) delegator).inform(loader);