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Data Repository Support for Micronaut
/*
* Copyright 2017-2020 original authors
*
* 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
*
* https://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 io.micronaut.data.runtime.mapper;
import java.math.BigDecimal;
import java.util.Date;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.type.Argument;
import io.micronaut.data.exceptions.DataAccessException;
import io.micronaut.data.model.DataType;
/**
* A result reader is a type that is capable of reading data from the given result set type.
*
* @param The result set
* @param The index type
*/
public interface ResultReader {
/**
* Convert the value to the given type.
* @param value The value
* @param type The type
* @param The generic type
* @return The converted value
* @throws DataAccessException if the value cannot be converted
*/
default T convertRequired(Object value, Class type) {
return ConversionService.SHARED.convert(
value,
type
).orElseThrow(() ->
new DataAccessException("Cannot convert type [" + value.getClass() + "] with value [" + value + "] to target type: " + type + ". Consider defining a TypeConverter bean to handle this case.")
);
}
/**
* Convert the value to the given type.
* @param value The value
* @param type The type
* @param The generic type
* @return The converted value
* @throws DataAccessException if the value cannot be converted
*/
default T convertRequired(Object value, Argument type) {
return ConversionService.SHARED.convert(
value,
type
).orElseThrow(() ->
new DataAccessException("Cannot convert type [" + value.getClass() + "] with value [" + value + "] to target type: " + type + ". Consider defining a TypeConverter bean to handle this case.")
);
}
/**
* Get a value from the given result set for the given name and type.
* @param resultSet The result set
* @param name The name
* @param type The type
* @param The generic type
* @return The value
* @throws DataAccessException if the value cannot be read
*/
@Nullable T getRequiredValue(RS resultSet, IDX name, Class type)
throws DataAccessException;
/**
* Move the index to the next result if possible.
* @return The next result
* @param resultSet The result set
*/
boolean next(RS resultSet);
/**
* Read a value dynamically using the result set and the given name and data type.
* @param resultSet The result set
* @param index The name
* @param dataType The data type
* @return The value, can be null
* @throws DataAccessException if the value cannot be read
*/
default @Nullable Object readDynamic(
@NonNull RS resultSet,
@NonNull IDX index,
@NonNull DataType dataType) {
switch (dataType) {
case STRING:
case UUID:
case JSON:
return readString(resultSet, index);
case LONG:
return readLong(resultSet, index);
case INTEGER:
return readInt(resultSet, index);
case BOOLEAN:
return readBoolean(resultSet, index);
case BYTE:
return readByte(resultSet, index);
case TIMESTAMP:
return readTimestamp(resultSet, index);
case DATE:
return readDate(resultSet, index);
case CHARACTER:
return readChar(resultSet, index);
case FLOAT:
return readFloat(resultSet, index);
case SHORT:
return readShort(resultSet, index);
case DOUBLE:
return readDouble(resultSet, index);
case BYTE_ARRAY:
return readBytes(resultSet, index);
case BIGDECIMAL:
return readBigDecimal(resultSet, index);
case OBJECT:
default:
return getRequiredValue(resultSet, index, Object.class);
}
}
/**
* Read a long value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The long value
*/
default long readLong(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, long.class);
}
/**
* Read a char value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The char value
*/
default char readChar(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, char.class);
}
/**
* Read a date value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The char value
*/
default Date readDate(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, Date.class);
}
/**
* Read a timestamp value for the given index.
* @param resultSet The result set
* @param index The index (such as the column name)
* @return The char value
*/
default Date readTimestamp(RS resultSet, IDX index) {
return getRequiredValue(resultSet, index, Date.class);
}
/**
* Read a string value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The string value
*/
default @Nullable String readString(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, String.class);
}
/**
* Read a int value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The int value
*/
default int readInt(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, int.class);
}
/**
* Read a boolean value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The boolean value
*/
default boolean readBoolean(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, boolean.class);
}
/**
* Read a float value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The float value
*/
default float readFloat(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, float.class);
}
/**
* Read a byte value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The byte value
*/
default byte readByte(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, byte.class);
}
/**
* Read a short value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The short value
*/
default short readShort(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, short.class);
}
/**
* Read a double value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The double value
*/
default double readDouble(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, double.class);
}
/**
* Read a BigDecimal value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The BigDecimal value
*/
default BigDecimal readBigDecimal(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, BigDecimal.class);
}
/**
* Read a byte[] value for the given name.
* @param resultSet The result set
* @param name The name (such as the column name)
* @return The byte[] value
*/
default byte[] readBytes(RS resultSet, IDX name) {
return getRequiredValue(resultSet, name, byte[].class);
}
}
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