org.hibernate.search.elasticsearch.schema.impl.model.ElasticsearchFormatJsonAdapter.java Source code

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Here is the source code for org.hibernate.search.elasticsearch.schema.impl.model.ElasticsearchFormatJsonAdapter.java

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/*
 * Hibernate Search, full-text search for your domain model
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.search.elasticsearch.schema.impl.model;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.hibernate.search.util.StringHelper;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

/**
 * @author Yoann Rodiere
 */
public class ElasticsearchFormatJsonAdapter extends TypeAdapter<List<String>> {

    private static final String FORMAT_SEPARATOR_REGEX = "\\|\\|";
    private static final String FORMAT_SEPARATOR = "||";

    @Override
    public void write(JsonWriter out, List<String> value) throws IOException {
        if (value == null) {
            out.nullValue();
            return;
        }

        String joinedFormats = StringHelper.join(value, FORMAT_SEPARATOR);
        out.value(joinedFormats);
    }

    @Override
    public List<String> read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
            in.nextNull();
            return null;
        }

        String joinedFormats = in.nextString();
        List<String> formats = Arrays.asList(joinedFormats.split(FORMAT_SEPARATOR_REGEX));
        return formats;
    }

}