Package org.apache.nutch.util

Class JexlUtil

java.lang.Object

org.apache.nutch.util.JexlUtil

public class JexlUtil
extends Object

Utility methods for handling JEXL expressions used in crawl and index pipelines. Expressions are evaluated under a JexlSandbox with JexlFeatures.newInstance(boolean) disabled so arbitrary classes cannot be instantiated from user-supplied configuration.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DISABLE_SANDBOX_KEY	When true, JEXL parsing skips the sandbox (unsafe).

Method Summary

Modifier and Type	Method	Description
static org.apache.commons.jexl3.JexlScript	parseExpression(String expr)	Parses a JEXL expression using the default (sandboxed) engine.
static org.apache.commons.jexl3.JexlScript	parseExpression(Configuration conf, String expr)	Parses a JEXL expression.

Methods inherited from class java.lang.Object

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

Field Details

DISABLE_SANDBOX_KEY

public static final String DISABLE_SANDBOX_KEY

When true, JEXL parsing skips the sandbox (unsafe). For trusted environments only; not recommended.

See Also:

• Constant Field Values

Method Details

parseExpression

public static org.apache.commons.jexl3.JexlScript parseExpression(String expr)

Parses a JEXL expression using the default (sandboxed) engine. Use parseExpression(Configuration, String) when a Configuration is available so DISABLE_SANDBOX_KEY can be honored.

Parameters:

expr - string JEXL expression

Returns:

parsed JEXL expression or null in case of parse error

parseExpression

public static org.apache.commons.jexl3.JexlScript parseExpression(Configuration conf,
 String expr)

Parses a JEXL expression. Unless DISABLE_SANDBOX_KEY is set to true in conf, the expression is parsed for execution under a restrictive sandbox.

Parameters:

conf - Hadoop configuration, or null to always use the sandbox

expr - string JEXL expression

Returns:

parsed JEXL expression or null in case of parse error