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Merge pull request #5 from kamatama41/kotlin
Kotlinize
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src/main/java/org/embulk/filter/hash/HashFilterPlugin.java
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src/main/kotlin/org/embulk/filter/hash/HashFilterPlugin.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package org.embulk.filter.hash | ||
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| import com.google.common.base.Optional | ||
| import org.embulk.config.Config | ||
| import org.embulk.config.ConfigDefault | ||
| import org.embulk.config.ConfigSource | ||
| import org.embulk.config.Task | ||
| import org.embulk.config.TaskSource | ||
| import org.embulk.spi.Column | ||
| import org.embulk.spi.DataException | ||
| import org.embulk.spi.Exec | ||
| import org.embulk.spi.FilterPlugin | ||
| import org.embulk.spi.Page | ||
| import org.embulk.spi.PageBuilder | ||
| import org.embulk.spi.PageOutput | ||
| import org.embulk.spi.PageReader | ||
| import org.embulk.spi.Schema | ||
| import org.embulk.spi.type.Types | ||
| import java.security.MessageDigest | ||
|
|
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| class HashFilterPlugin : FilterPlugin { | ||
|
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| interface PluginTask : Task { | ||
| @Config("columns") | ||
| fun getColumns(): List<HashColumn> | ||
| } | ||
|
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| interface HashColumn : Task { | ||
| @Config("name") | ||
| fun getName(): String | ||
|
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| @Config("algorithm") | ||
| @ConfigDefault("\"SHA-256\"") | ||
| fun getAlgorithm(): Optional<String> | ||
|
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| @Config("new_name") | ||
| @ConfigDefault("null") | ||
| fun getNewName(): Optional<String> | ||
| } | ||
|
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| override fun transaction(config: ConfigSource, inputSchema: Schema, control: FilterPlugin.Control) { | ||
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| val task = config.loadConfig(PluginTask::class.java) | ||
| val hashColumnMap = convertHashColumnListToMap(task.getColumns()) | ||
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| val builder = Schema.builder() | ||
| inputSchema.columns.forEach { column -> | ||
| val hashColumn = hashColumnMap[column.name] | ||
| if (hashColumn != null) { | ||
| builder.add(hashColumn.getNewName().or(column.name), Types.STRING) | ||
| } else { | ||
| builder.add(column.name, column.type) | ||
| } | ||
| } | ||
| control.run(task.dump(), builder.build()) | ||
| } | ||
|
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| override fun open(taskSource: TaskSource, inputSchema: Schema, | ||
| outputSchema: Schema, output: PageOutput): PageOutput { | ||
|
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| val task = taskSource.loadTask(PluginTask::class.java) | ||
| val hashColumnMap = convertHashColumnListToMap(task.getColumns()) | ||
| val outputColumnMap = convertColumnListToMap(outputSchema.columns) | ||
|
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| return object : PageOutput { | ||
| private val reader = PageReader(inputSchema) | ||
| private val builder = PageBuilder(Exec.getBufferAllocator(), outputSchema, output) | ||
|
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| override fun add(page: Page) { | ||
| reader.setPage(page) | ||
| while (reader.nextRecord()) { | ||
| setValue() | ||
| builder.addRecord() | ||
| } | ||
| } | ||
|
|
||
| private fun setValue() { | ||
| for (inputColumn in inputSchema.columns) { | ||
| if (reader.isNull(inputColumn)) { | ||
| builder.setNull(inputColumn) | ||
| continue | ||
| } | ||
|
|
||
| // Write the original data | ||
| val inputValue : Any = when (inputColumn.type) { | ||
| Types.STRING -> { | ||
| reader.getString(inputColumn).apply { builder.setString(inputColumn, this) } | ||
| } | ||
| Types.BOOLEAN -> { | ||
| reader.getBoolean(inputColumn).apply { builder.setBoolean(inputColumn, this) } | ||
| } | ||
| Types.DOUBLE -> { | ||
| reader.getDouble(inputColumn).apply { builder.setDouble(inputColumn, this) } | ||
| } | ||
| Types.LONG -> { | ||
| reader.getLong(inputColumn).apply { builder.setLong(inputColumn, this) } | ||
| } | ||
| Types.TIMESTAMP -> { | ||
| reader.getTimestamp(inputColumn).apply { builder.setTimestamp(inputColumn, this) } | ||
| } | ||
| Types.JSON -> { | ||
| reader.getJson(inputColumn).apply { builder.setJson(inputColumn, this) } | ||
| } else -> { | ||
| throw DataException("Unexpected type:" + inputColumn.type) | ||
| } | ||
| } | ||
|
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| // Overwrite the column if it's hash column. | ||
| hashColumnMap[inputColumn.name]?.let { hashColumn -> | ||
| val outputColumn = outputColumnMap[hashColumn.getNewName().or(inputColumn.name)] | ||
| val hashedValue = generateHash(inputValue.toString(), hashColumn.getAlgorithm().get()) | ||
| builder.setString(outputColumn, hashedValue) | ||
| } | ||
| } | ||
| } | ||
|
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| private fun generateHash(value: String, algorithm: String): String { | ||
| val md = MessageDigest.getInstance(algorithm) | ||
| md.update(value.toByteArray()) | ||
| return md.digest().joinToString("") { "%02x".format(it) } | ||
| } | ||
|
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| override fun finish() { | ||
| builder.finish() | ||
| } | ||
|
|
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| override fun close() { | ||
| builder.close() | ||
| } | ||
| } | ||
| } | ||
|
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| private fun convertHashColumnListToMap(hashColumns: List<HashColumn>?): Map<String, HashColumn> { | ||
| return hashColumns!!.associate { Pair(it.getName(), it) } | ||
| } | ||
|
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| private fun convertColumnListToMap(columns: List<Column>?): Map<String, Column> { | ||
| return columns!!.associate { Pair(it.name, it) } | ||
| } | ||
| } |
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