annis.sqlgen.AnnotatedSpanExtractor.java Source code

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Here is the source code for annis.sqlgen.AnnotatedSpanExtractor.java

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/*
 * Copyright 2013 SFB 632.
 *
 * 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 annis.sqlgen;

import annis.dao.objects.AnnotatedSpan;
import annis.model.Annotation;
import com.google.common.base.Preconditions;
import java.io.UnsupportedEncodingException;
import java.sql.Array;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.core.RowMapper;

/**
 * Maps a {@link ResultSet} row to an {@link AnnotatedSpan}
 * @author Thomas Krause <krauseto@hu-berlin.de>
 */
public class AnnotatedSpanExtractor implements RowMapper<AnnotatedSpan> {
    private final Logger log = LoggerFactory.getLogger(AnnotatedSpanExtractor.class);

    private List<Annotation> extractAnnotations(Array array) throws SQLException {
        List<Annotation> result = new ArrayList<>();

        if (array != null) {
            String[] arrayLines = (String[]) array.getArray();

            for (String line : arrayLines) {
                if (line != null) {
                    String namespace = null;
                    String name = null;
                    String value = null;

                    String[] split = line.split(":", 3);

                    Preconditions.checkState(split.length == 3,
                            "The annotation string for the matrix entry must contain a namespace, name and value");

                    if (split.length == 3) {
                        namespace = split[0];
                        name = split[1];
                        value = split[2];
                    }

                    if ("".equals(namespace)) {
                        namespace = null;
                    }

                    result.add(new annis.model.Annotation(namespace, name, value));
                } // if line not null
            }
        }

        return result;
    }

    @Override
    public AnnotatedSpan mapRow(ResultSet resultSet, int rowNum) throws SQLException {
        long id = resultSet.getLong("id");
        String coveredText = resultSet.getString("span");

        Array arrayAnnotation = resultSet.getArray("annotations");
        ResultSetMetaData rsMeta = resultSet.getMetaData();
        Array arrayMeta = null;
        for (int i = 1; i <= rsMeta.getColumnCount(); i++) {
            if ("metadata".equals(rsMeta.getColumnName(i))) {
                arrayMeta = resultSet.getArray(i);
                break;
            }
        }

        List<Annotation> annotations = extractAnnotations(arrayAnnotation);
        List<Annotation> metaData = arrayMeta == null ? new LinkedList<Annotation>()
                : extractAnnotations(arrayMeta);

        // create key
        Array sqlKey = resultSet.getArray("key");
        Validate.isTrue(!resultSet.wasNull(), "Match group identifier must not be null");
        Validate.isTrue(sqlKey.getBaseType() == Types.BIGINT,
                "Key in database must be from the type \"bigint\" but was \"" + sqlKey.getBaseTypeName() + "\"");

        List<Long> key = Arrays.asList((Long[]) sqlKey.getArray());

        return new AnnotatedSpan(id, coveredText, annotations, metaData, key);
    }
}