openjava.mop
Class QueryEnvironment

java.lang.Object
  |
  +--openjava.mop.Environment
        |
        +--openjava.mop.ClosedEnvironment
              |
              +--openjava.mop.QueryEnvironment

public class QueryEnvironment

extends ClosedEnvironment

QueryEnvironment is the environment seen inside a QueryExpression. The 'variables' are the tables in the from list; it inherits stuff from the enclosing java environment, plus from enclosing queries. TBD: can queries in a from list inherit?

Nested Class Summary

Nested classes inherited from class openjava.mop.Environment

Environment.BasicVariableInfo, Environment.VariableInfo

Field Summary

private QueryExpression

query

Fields inherited from class openjava.mop.ClosedEnvironment

symbol_table, table

Fields inherited from class openjava.mop.Environment

parent

Constructor Summary

QueryEnvironment(Environment e, QueryExpression query)

Method Summary

boolean	isAggregating()
boolean	isBind(String name) Returns whether a name is a variable.
Environment.VariableInfo	lookupBind(String name) Looks up a binded type of the given variable or field name.
Expression	lookupFrom(String name)
Expression	lookupFrom(String name, int[] offset) Looks for a from-list item called name.

Methods inherited from class openjava.mop.ClosedEnvironment

bindVariable, lookupClass, record, toString

Methods inherited from class openjava.mop.Environment

bindVariable, currentClassName, getClassEnvironmentParent, getGlobalEnvironment, getPackage, getParent, isQualifiedName, isRegisteredModifier, lookupClass, recordMemberClass, toPackageName, toQualifiedName, toSimpleName

Methods inherited from class java.lang.Object

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

Field Detail

query

private QueryExpression query

Constructor Detail

QueryEnvironment

public QueryEnvironment(Environment e,
                        QueryExpression query)

Method Detail

lookupBind

public Environment.VariableInfo lookupBind(String name)

Description copied from class: Environment

Looks up a binded type of the given variable or field name.

Overrides:

lookupBind in class ClosedEnvironment

Parameters:

name - the fully-qualified name of the class

isBind

public boolean isBind(String name)

Description copied from class: Environment

Returns whether a name is a variable. (In some situations, we cannot use Environment.lookupBind(java.lang.String), because the tree is not yet in a state where we can infer types.)

Overrides:

isBind in class Environment

lookupFrom

public Expression lookupFrom(String name,
                             int[] offset)

Looks for a from-list item called name.

Parameters:

name - name of from-list item

offset - writes the zero-based offset to offset[0] if the item is found

Returns:

the expression if found, null if not

lookupFrom

public Expression lookupFrom(String name)

isAggregating

public boolean isAggregating()