ClasspathAnalyzerBuilder.java example

Explorer
stratio-cassandra-master
/*
 * Copyright 2015, Stratio.
 *
 * 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 com.stratio.cassandra.index.schema.analysis;

import org.apache.lucene.analysis.Analyzer;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;

import java.lang.reflect.Constructor;

/**
 * {@link AnalyzerBuilder} for building {@link Analyzer}s in classpath using its default (no args) constructor.
 *
 * @author Andres de la Pena <adelapena@stratio.com>
 */
public class ClasspathAnalyzerBuilder extends AnalyzerBuilder {

    private Analyzer analyzer;

    /**
     * Builds a new {@link AnalyzerBuilder} using the specified {@link Analyzer} full class name.
     *
     * @param className An {@link Analyzer} full class name.
     */
    @JsonCreator
    public ClasspathAnalyzerBuilder(@JsonProperty("class") String className) {
        try {
            Class<?> analyzerClass = Class.forName(className);
            Constructor<?> constructor = analyzerClass.getConstructor();
            analyzer = (Analyzer) constructor.newInstance();
        } catch (Exception e) {
            throw new IllegalArgumentException("Analyzer not found: " + className, e);
        }
    }

    /** {@inheritDoc} */
    @Override
    public Analyzer analyzer() {
        return analyzer;
    }
}