RegisterByteString.java

/*
 * Copyright 2019 Providence Authors
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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 net.morimekta.proto.jdbi.v3.annotations;

import com.google.protobuf.ByteString;
import net.morimekta.proto.jdbi.v3.ByteStringColumnMapper;
import net.morimekta.proto.jdbi.v3.util.ByteStringArgumentFactory;
import org.jdbi.v3.core.statement.SqlStatement;
import org.jdbi.v3.sqlobject.customizer.SqlStatementCustomizer;
import org.jdbi.v3.sqlobject.customizer.SqlStatementCustomizerFactory;
import org.jdbi.v3.sqlobject.customizer.SqlStatementCustomizingAnnotation;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;

/**
 * Register byte string mappers for column result and argument mappers.
 */
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
@SqlStatementCustomizingAnnotation(RegisterByteString.Factory.class)
public @interface RegisterByteString {
    class Factory implements SqlStatementCustomizerFactory {
        @Override
        public SqlStatementCustomizer createForType(Annotation annotation, Class<?> sqlObjectType) {
            return create();
        }

        @Override
        public SqlStatementCustomizer createForMethod(Annotation annotation, Class<?> sqlObjectType, Method method) {
            return create();
        }

        private static SqlStatementCustomizer create() {
            return INSTANCE;
        }

        private static final ByteStringStatementCustomizer INSTANCE = new ByteStringStatementCustomizer();

        private static class ByteStringStatementCustomizer implements SqlStatementCustomizer {
            @Override
            public void apply(SqlStatement<?> stmt) {
                stmt.registerColumnMapper(ByteString.class, ByteStringColumnMapper.INSTANCE);
                stmt.registerArgument(ByteStringArgumentFactory.INSTANCE);
            }
        }
    }
}