org.globus.cog.karajan.util
Class DefUtil

java.lang.Object
  org.globus.cog.karajan.util.DefUtil

public class DefUtil
extends Object

Field Summary

static String	ENV
static String	ENV_CACHE
static org.apache.log4j.Logger	logger

Constructor Summary

DefUtil()

Method Summary

static void	addDef(VariableStack stack, StackFrame where, String prefix, String name, Object def)
static DefList.Entry	getDef(VariableStack stack, String type, FlowElement parent)
static void	updateEnvCache(VariableStack stack, StackFrame frame) The environment cache is used to optimize the capturing of environments when defining elements It is necessary because stack.copy() is a costly operation This method does not initialize it, but it marks on a specific frame that any parent caches would be invalid.

Methods inherited from class java.lang.Object

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

Field Detail

logger

public static final org.apache.log4j.Logger logger

ENV_CACHE

public static final String ENV_CACHE

See Also:

Constant Field Values

ENV

public static final String ENV

See Also:

Constant Field Values

Constructor Detail

DefUtil

public DefUtil()

Method Detail

addDef

public static void addDef(VariableStack stack,
                          StackFrame where,
                          String prefix,
                          String name,
                          Object def)

updateEnvCache

public static void updateEnvCache(VariableStack stack,
                                  StackFrame frame)

The environment cache is used to optimize the capturing of environments when defining elements It is necessary because stack.copy() is a costly operation This method does not initialize it, but it marks on a specific frame that any parent caches would be invalid. It is not initialized because there is no guarantee that an element would be defined in this environment, therefore the caching may be useless. A lambda, if it finds an empty cache, should update it with a copy of the stack up to the frame in cause and from the closest barrier. It should also link with the previous environment.

getDef

public static DefList.Entry getDef(VariableStack stack,
                                   String type,
                                   FlowElement parent)
                            throws ExecutionException

Throws:

ExecutionException