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Merge pull request #40 from rhauch/dbz-29b
DBZ-29 Refactored ColumnMappers
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24 changes: 0 additions & 24 deletions
24
debezium-core/src/main/java/io/debezium/relational/ColumnMapper.java
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136 changes: 77 additions & 59 deletions
136
debezium-core/src/main/java/io/debezium/relational/TableSchemaBuilder.java
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46 changes: 46 additions & 0 deletions
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debezium-core/src/main/java/io/debezium/relational/mapping/ColumnMapper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| /* | ||
| * Copyright Debezium Authors. | ||
| * | ||
| * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0 | ||
| */ | ||
| package io.debezium.relational.mapping; | ||
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| import org.apache.kafka.connect.data.Field; | ||
| import org.apache.kafka.connect.data.SchemaBuilder; | ||
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| import io.debezium.config.Configuration; | ||
| import io.debezium.relational.Column; | ||
| import io.debezium.relational.ValueConverter; | ||
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| /** | ||
| * A factory for a function used to map values of a column. | ||
| * | ||
| * @author Randall Hauch | ||
| */ | ||
| @FunctionalInterface | ||
| public interface ColumnMapper { | ||
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| /** | ||
| * Initialize the ColumnMapper instance based upon the connector's configuration. | ||
| * @param config the connector's configuration | ||
| */ | ||
| default void initialize( Configuration config ) { | ||
| // do nothing | ||
| } | ||
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| /** | ||
| * Create for the given column a function that maps values. | ||
| * | ||
| * @param column the column description; never null | ||
| * @return the function that converts the value; may be null | ||
| */ | ||
| ValueConverter create(Column column); | ||
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| /** | ||
| * Optionally annotate the schema with properties to better capture the mapping behavior. | ||
| * @param schemaBuilder the builder for the {@link Field}'s schema; never null | ||
| */ | ||
| default void alterFieldSchema( SchemaBuilder schemaBuilder) { | ||
| // do nothing | ||
| } | ||
| } |
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73 changes: 73 additions & 0 deletions
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debezium-core/src/main/java/io/debezium/relational/mapping/MaskStrings.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| /* | ||
| * Copyright Debezium Authors. | ||
| * | ||
| * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0 | ||
| */ | ||
| package io.debezium.relational.mapping; | ||
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| import java.sql.Types; | ||
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| import org.apache.kafka.connect.data.SchemaBuilder; | ||
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| import io.debezium.annotation.Immutable; | ||
| import io.debezium.relational.Column; | ||
| import io.debezium.relational.ValueConverter; | ||
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| /** | ||
| * A {@link ColumnMapper} implementation that ensures that string values are masked by a predefined value. | ||
| * | ||
| * @author Randall Hauch | ||
| */ | ||
| public class MaskStrings implements ColumnMapper { | ||
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| private final MaskingValueConverter converter; | ||
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| /** | ||
| * Create a {@link ColumnMapper} that masks string values with a predefined value. | ||
| * | ||
| * @param maskValue the value that should be used in place of the actual value; may not be null | ||
| * @throws IllegalArgumentException if the {@code maxLength} is not positive | ||
| */ | ||
| public MaskStrings(String maskValue) { | ||
| if (maskValue == null) throw new IllegalArgumentException("Mask value may not be null"); | ||
| this.converter = new MaskingValueConverter(maskValue); | ||
| } | ||
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| @Override | ||
| public ValueConverter create(Column column) { | ||
| switch (column.jdbcType()) { | ||
| case Types.CHAR: // variable-length | ||
| case Types.VARCHAR: // variable-length | ||
| case Types.LONGVARCHAR: // variable-length | ||
| case Types.CLOB: // variable-length | ||
| case Types.NCHAR: // fixed-length | ||
| case Types.NVARCHAR: // fixed-length | ||
| case Types.LONGNVARCHAR: // fixed-length | ||
| case Types.NCLOB: // fixed-length | ||
| case Types.DATALINK: | ||
| return converter; | ||
| default: | ||
| return ValueConverter.passthrough(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void alterFieldSchema(SchemaBuilder schemaBuilder) { | ||
| schemaBuilder.parameter("masked", "true"); | ||
| } | ||
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| @Immutable | ||
| protected static final class MaskingValueConverter implements ValueConverter { | ||
| protected final String maskValue; | ||
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| public MaskingValueConverter(String maskValue) { | ||
| this.maskValue = maskValue; | ||
| assert this.maskValue != null; | ||
| } | ||
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| @Override | ||
| public Object convert(Object value) { | ||
| return maskValue; | ||
| } | ||
| } | ||
| } |
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