com.google.cloud.dataflow.sdk.util

Class StringUtils

java.lang.Object

com.google.cloud.dataflow.sdk.util.StringUtils

public class StringUtils
extends Object

Utilities for working with JSON and other human-readable string formats.

Constructor Summary

Constructors

Constructor and Description
StringUtils()

Method Summary

Modifier and Type	Method and Description
static String	approximatePTransformName(Class<?> clazz) Returns a name for a PTransform class.
static String	approximateSimpleName(Class<?> clazz) Returns a simple name for a class.
static String	byteArrayToJsonString(byte[] bytes) Converts the given array of bytes into a legal JSON string.
static int	getLevenshteinDistance(String s, String t) Calculate the Levenshtein distance between two strings.
static byte[]	jsonStringToByteArray(String string) Converts the given string, encoded using byteArrayToJsonString(byte[]), into a byte array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StringUtils

public StringUtils()

Method Detail

byteArrayToJsonString

public static String byteArrayToJsonString(byte[] bytes)

Converts the given array of bytes into a legal JSON string.

Uses a simple strategy of converting each byte to a single char, except for non-printable chars, non-ASCII chars, and '%', '\', and '"', which are encoded as three chars in '%xx' format, where 'xx' is the hexadecimal encoding of the byte.

jsonStringToByteArray

public static byte[] jsonStringToByteArray(String string)

Converts the given string, encoded using byteArrayToJsonString(byte[]), into a byte array.

Throws:

IllegalArgumentException - if the argument string is not legal

approximateSimpleName

public static String approximateSimpleName(Class<?> clazz)

Returns a simple name for a class.

Note: this is non-invertible - the name may be simplified to an extent that it cannot be mapped back to the original class.

This can be used to generate human-readable names. It removes the package and outer classes from the name, and removes common suffixes.

Examples:

• some.package.Word.SummaryDoFn -> "Summary"
• another.package.PairingFn -> "Pairing"

Throws:

IllegalArgumentException - if the class is anonymous

approximatePTransformName

public static String approximatePTransformName(Class<?> clazz)

Returns a name for a PTransform class.

This can be used to generate human-readable transform names. It removes the package from the name, and removes common suffixes.

It is different than approximateSimpleName:

• 1. It keeps the outer classes names.
• 2. It removes the common transform inner class: "Bound".

Examples:

• some.package.Word.Summary -> "Word.Summary"
• another.package.Pairing.Bound -> "Pairing"

getLevenshteinDistance

public static int getLevenshteinDistance(String s,
                                         String t)

Calculate the Levenshtein distance between two strings.

The Levenshtein distance between two words is the minimum number of single-character edits (i.e. insertions, deletions or substitutions) required to change one string into the other.