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//
// Licensed 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.
package org.apache.couchdb.nouveau.resources;
import com.codahale.metrics.annotation.ExceptionMetered;
import com.codahale.metrics.annotation.Metered;
import com.codahale.metrics.annotation.ResponseMetered;
import jakarta.validation.Valid;
import jakarta.validation.constraints.NotNull;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response.Status;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.couchdb.nouveau.api.AnalyzeRequest;
import org.apache.couchdb.nouveau.api.AnalyzeResponse;
import org.apache.couchdb.nouveau.lucene9.Lucene9AnalyzerFactory;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
@Path("/analyze")
@Metered
@ResponseMetered
@ExceptionMetered(cause = IOException.class)
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public final class AnalyzeResource {
@POST
public AnalyzeResponse analyzeText(@NotNull @Valid AnalyzeRequest request) throws IOException {
try {
final List<String> tokens =
tokenize(Lucene9AnalyzerFactory.newAnalyzer(request.getAnalyzer()), request.getText());
return new AnalyzeResponse(tokens);
} catch (IllegalArgumentException e) {
throw new WebApplicationException(request.getAnalyzer() + " not a valid analyzer", Status.BAD_REQUEST);
}
}
private List<String> tokenize(final Analyzer analyzer, final String text) throws IOException {
final List<String> result = new ArrayList<String>(10);
try (final TokenStream tokenStream = analyzer.tokenStream("default", text)) {
tokenStream.reset();
while (tokenStream.incrementToken()) {
final CharTermAttribute term = tokenStream.getAttribute(CharTermAttribute.class);
result.add(term.toString());
}
tokenStream.end();
}
return result;
}
}
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