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/*
* 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 org.apache.spark.sql.catalyst
import java.io._
import java.nio.charset.StandardCharsets
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.types.{NumericType, StringType}
import org.apache.spark.unsafe.types.UTF8String
import org.apache.spark.util.Utils
package object util {
/** Silences output to stderr or stdout for the duration of f */
def quietly[A](f: => A): A = {
val origErr = System.err
val origOut = System.out
try {
System.setErr(new PrintStream(new OutputStream {
def write(b: Int) = {}
}))
System.setOut(new PrintStream(new OutputStream {
def write(b: Int) = {}
}))
f
} finally {
System.setErr(origErr)
System.setOut(origOut)
}
}
def fileToString(file: File, encoding: String = "UTF-8"): String = {
val inStream = new FileInputStream(file)
val outStream = new ByteArrayOutputStream
try {
var reading = true
while ( reading ) {
inStream.read() match {
case -1 => reading = false
case c => outStream.write(c)
}
}
outStream.flush()
}
finally {
inStream.close()
}
new String(outStream.toByteArray, encoding)
}
def resourceToBytes(
resource: String,
classLoader: ClassLoader = Utils.getSparkClassLoader): Array[Byte] = {
val inStream = classLoader.getResourceAsStream(resource)
val outStream = new ByteArrayOutputStream
try {
var reading = true
while ( reading ) {
inStream.read() match {
case -1 => reading = false
case c => outStream.write(c)
}
}
outStream.flush()
}
finally {
inStream.close()
}
outStream.toByteArray
}
def resourceToString(
resource: String,
encoding: String = "UTF-8",
classLoader: ClassLoader = Utils.getSparkClassLoader): String = {
new String(resourceToBytes(resource, classLoader), encoding)
}
def stringToFile(file: File, str: String): File = {
val out = new PrintWriter(file)
out.write(str)
out.close()
file
}
def sideBySide(left: String, right: String): Seq[String] = {
sideBySide(left.split("\n"), right.split("\n"))
}
def sideBySide(left: Seq[String], right: Seq[String]): Seq[String] = {
val maxLeftSize = left.map(_.length).max
val leftPadded = left ++ Seq.fill(math.max(right.size - left.size, 0))("")
val rightPadded = right ++ Seq.fill(math.max(left.size - right.size, 0))("")
leftPadded.zip(rightPadded).map {
case (l, r) => (if (l == r) " " else "!") + l + (" " * ((maxLeftSize - l.length) + 3)) + r
}
}
def stackTraceToString(t: Throwable): String = {
val out = new java.io.ByteArrayOutputStream
val writer = new PrintWriter(out)
t.printStackTrace(writer)
writer.flush()
new String(out.toByteArray, StandardCharsets.UTF_8)
}
def stringOrNull(a: AnyRef): String = if (a == null) null else a.toString
def benchmark[A](f: => A): A = {
val startTime = System.nanoTime()
val ret = f
val endTime = System.nanoTime()
// scalastyle:off println
println(s"${(endTime - startTime).toDouble / 1000000}ms")
// scalastyle:on println
ret
}
// Replaces attributes, string literals, complex type extractors with their pretty form so that
// generated column names don't contain back-ticks or double-quotes.
def usePrettyExpression(e: Expression): Expression = e transform {
case a: Attribute => new PrettyAttribute(a)
case Literal(s: UTF8String, StringType) => PrettyAttribute(s.toString, StringType)
case Literal(v, t: NumericType) if v != null => PrettyAttribute(v.toString, t)
case e: GetStructField =>
val name = e.name.getOrElse(e.childSchema(e.ordinal).name)
PrettyAttribute(usePrettyExpression(e.child).sql + "." + name, e.dataType)
case e: GetArrayStructFields =>
PrettyAttribute(usePrettyExpression(e.child) + "." + e.field.name, e.dataType)
}
def quoteIdentifier(name: String): String = {
// Escapes back-ticks within the identifier name with double-back-ticks, and then quote the
// identifier with back-ticks.
"`" + name.replace("`", "``") + "`"
}
/**
* Returns the string representation of this expression that is safe to be put in
* code comments of generated code. The length is capped at 128 characters.
*/
def toCommentSafeString(str: String): String = {
val len = math.min(str.length, 128)
val suffix = if (str.length > len) "..." else ""
str.substring(0, len).replace("*/", "\\*\\/").replace("\\u", "\\\\u") + suffix
}
/* FIX ME
implicit class debugLogging(a: Any) {
def debugLogging() {
org.apache.log4j.Logger.getLogger(a.getClass.getName).setLevel(org.apache.log4j.Level.DEBUG)
}
} */
}
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