org.skife.jdbi.v2.InferredMapperFactory Maven / Gradle / Ivy

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/*
 * Copyright 2004-2014 Brian McCallister
 * Copyright 2010-2014 Ning, Inc.
 * Copyright 2014-2020 Groupon, Inc
 * Copyright 2020-2020 Equinix, Inc
 * Copyright 2014-2020 The Billing Project, LLC
 *
 * The Billing Project licenses this file to you 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.skife.jdbi.v2;

import com.fasterxml.classmate.ResolvedType;
import com.fasterxml.classmate.TypeResolver;
import org.skife.jdbi.v2.tweak.ResultSetMapper;

import java.util.List;

class InferredMapperFactory implements ResultSetMapperFactory
{
    private static final TypeResolver tr = new TypeResolver();
    private final Class maps;
    private final ResultSetMapper mapper;

    public InferredMapperFactory(ResultSetMapper mapper)
    {
        this.mapper = mapper;
        ResolvedType rt = tr.resolve(mapper.getClass());
        List rs = rt.typeParametersFor(ResultSetMapper.class);
        if (rs.isEmpty() || rs.get(0).getErasedType().equals(Object.class)) {
            throw new UnsupportedOperationException("Must use a concretely typed ResultSetMapper here");
        }

        maps = rs.get(0).getErasedType();
    }

    @Override
    public boolean accepts(Class type, StatementContext ctx)
    {
        return maps.equals(type);
    }

    @Override
    public ResultSetMapper mapperFor(Class type, StatementContext ctx)
    {
        return mapper;
    }
}