com.stehno.sjdbcx.reflection.extractor.RowMapperExtractor.java Source code

Introduction

Here is the source code for com.stehno.sjdbcx.reflection.extractor.RowMapperExtractor.java

Source

/*
 * Copyright (c) 2013 Christopher J. Stehno
 *
 * 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.stehno.sjdbcx.reflection.extractor;

import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.SingleColumnRowMapper;
import org.springframework.util.StringUtils;

import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;

/**
 *
 */
public class RowMapperExtractor extends AbstractCollaboratorExtractor<RowMapper> {

    public RowMapper extract(final Method method) {
        final com.stehno.sjdbcx.annotation.RowMapper mapper = AnnotationUtils.getAnnotation(method,
                com.stehno.sjdbcx.annotation.RowMapper.class);
        if (mapper == null) {
            Class mappedType = method.getReturnType();

            if (Collection.class.isAssignableFrom(mappedType)) {
                mappedType = (Class) ((ParameterizedType) method.getGenericReturnType())
                        .getActualTypeArguments()[0];

            } else if (mappedType.isArray()) {
                throw new UnsupportedOperationException("Auto-mapping for array return types is not yet supported");

            } else if (mappedType.isPrimitive()) {
                if (mappedType == int.class || mappedType == long.class) {
                    return new SingleColumnRowMapper();

                } else if (mappedType == boolean.class) {
                    return new RowMapper<Boolean>() {
                        @Override
                        public Boolean mapRow(final ResultSet resultSet, final int i) throws SQLException {
                            return resultSet.getBoolean(1);
                        }
                    };
                }
            }

            return new BeanPropertyRowMapper(mappedType);

        } else {
            final String extractKey = mapper.value();
            if (StringUtils.isEmpty(extractKey)) {
                return resolve((Class<RowMapper>) mapper.type());
            } else {
                return resolve(extractKey);
            }
        }
    }
}