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## Uses of Class
org.apache.xpath.Expression

Packages that use Expression
org.apache.xalan.templates | Implements the `Templates` interface, and defines a set of classes that represent an XSLT stylesheet.
org.apache.xalan.transformer | In charge of run-time transformations and the production of result trees.
org.apache.xpath | Implementation of XPath; for the most part, only classes meant for public use are found at this root level of the XPath packages.
org.apache.xpath.axes | Implementation of XPath LocationPath support -- primary classes are LocPathIterator and UnionPathIterator.
org.apache.xpath.compiler | Implements an XPath parser which produces an OpMap, and a so-called Compiler which produces an expression tree for fast evaluation.
org.apache.xpath.functions | Implements XPath functions -- each function is derived from Function, FunctionOneArg, Function2Args, etc, with number-of-arguments checking being applied mainly at compile time -- this package only implements XPath functions, XSLT functions are found in the "templates" package.
org.apache.xpath.objects | Implementation of XPath polymorphic type objects -- this package will grow as XPath objects are expanded to support XML Schema data types.
org.apache.xpath.operations | Support for XPath operations, such as +, -, string(), etc.
org.apache.xpath.patterns | Implementation of XPath nodeTest support, and XSLT pattern matching support.

Uses of Expression in org.apache.xalan.templates

Subclasses of Expression in org.apache.xalan.templates
`class` | `FuncDocument` **For advanced use only** Execute the Doc() function.
`class` | `FuncFormatNumb` **For advanced use only** Execute the FormatNumber() function.
`class` | `FuncKey` **For advanced use only** Execute the Key() function.
`class` | `XUnresolvedVariable` An instance of this class holds unto a variable until it is executed.
`class` | `XUnresolvedVariableSimple` This is the same as XUnresolvedVariable, but it assumes that the context is already set up.

Methods in org.apache.xalan.templates that return Expression
`Expression` | `ElemForEach.getSelect()` Get the "select" attribute.
`Expression` | `ElemForEach.getExpression()`

Methods in org.apache.xalan.templates with parameters of type Expression
`void` | `ElemForEach.setExpression(Expression exp)`
`boolean` | `RedundentExprEliminator.visitPredicate(ExpressionOwner owner, Expression pred)` Visit a predicate within a location path.

Uses of Expression in org.apache.xalan.transformer

Subclasses of Expression in org.apache.xalan.transformer
`class` | `KeyIterator` **For internal use only** This class implements an optimized iterator for "key()" patterns, matching each node to the match attribute in one or more xsl:key declarations.
`class` | `KeyRefIterator` **For internal use only** This class filters nodes from a key iterator, according to whether or not the use value matches the ref value.

Uses of Expression in org.apache.xpath

Methods in org.apache.xpath that return Expression
`Expression` | `ExpressionOwner.getExpression()` Get the raw Expression object that this class wraps.
`Expression` | `XPath.getExpression()` Get the raw Expression object that this class wraps.

Methods in org.apache.xpath with parameters of type Expression
`boolean` | `XPathVisitor.visitPredicate(ExpressionOwner owner, Expression pred)` Visit a predicate within a location path.
`abstract boolean` | `Expression.deepEquals(Expression expr)` Compare this object with another object and see if they are equal, include the sub heararchy.
`void` | `ExpressionOwner.setExpression(Expression exp)` Set the raw expression object for this object.
`void` | `XPath.setExpression(Expression exp)` Set the raw expression object for this object.

Constructors in org.apache.xpath with parameters of type Expression
`XPath.XPath(Expression expr)` Construct an XPath object.

Uses of Expression in org.apache.xpath.axes

Subclasses of Expression in org.apache.xpath.axes
`class` | `AttributeIterator` **For advanced use only** This class implements an optimized iterator for attribute axes patterns.
`class` | `AxesWalker` Serves as common interface for axes Walkers, and stores common state variables.
`class` | `BasicTestIterator` Base for iterators that handle predicates.
`class` | `ChildIterator` **For advanced use only** This class implements an optimized iterator for "node()" patterns, that is, any children of the context node.
`class` | `ChildTestIterator` **For advanced use only** This class implements an optimized iterator for children patterns that have a node test, and possibly a predicate.
`class` | `DescendantIterator` **For advanced use only** This class implements an optimized iterator for descendant, descendant-or-self, or "//foo" patterns.
`class` | `FilterExprIterator`
`class` | `FilterExprIteratorSimple` Class to use for one-step iteration that doesn't have a predicate, and doesn't need to set the context.
`class` | `FilterExprWalker` Walker for the OP_VARIABLE, or OP_EXTFUNCTION, or OP_FUNCTION, or OP_GROUP, op codes.
`class` | `LocPathIterator` **For advanced use only** This class extends NodeSetDTM, which implements NodeIterator, and fetches nodes one at a time in document order based on a XPath | `class` | `MatchPatternIterator` This class treats a LocationPath as a filtered iteration over the tree, evaluating each node in a super axis traversal against the LocationPath interpreted as a match pattern.
`class` | `NodeSequence` This class is the dynamic wrapper for a Xalan DTMIterator instance, and provides random access capabilities.
`class` | `OneStepIterator` **For advanced use only** This class implements a general iterator for those LocationSteps with only one step, and perhaps a predicate.
`class` | `OneStepIteratorForward` **For advanced use only** This class implements a general iterator for those LocationSteps with only one step, and perhaps a predicate, that only go forward (i.e.
`class` | `PredicatedNodeTest`
`class` | `ReverseAxesWalker` Walker for a reverse axes.
`class` | `SelfIteratorNoPredicate` **For advanced use only** This class implements an optimized iterator for "." patterns, that is, the self axes without any predicates.
`class` | `UnionChildIterator` This class defines a simplified type of union iterator that only tests along the child axes.
`class` | `UnionPathIterator` **For advanced use only** This class extends NodeSetDTM, which implements DTMIterator, and fetches nodes one at a time in document order based on a XPath UnionExpr.
`class` | `WalkingIterator` Location path iterator that uses Walkers.
`class` | `WalkingIteratorSorted` **For internal use only** This class iterates over set of nodes that needs to be sorted.

Methods in org.apache.xpath.axes that return Expression
`Expression` | `PredicatedNodeTest.getPredicate(int index)` Get a predicate expression at the given index.
`Expression` | `FilterExprIterator.getInnerExpression()` Get the inner contained expression of this filter.
`Expression` | `AxesWalker.getExpression()`
`Expression` | `FilterExprWalker.getInnerExpression()` Get the inner contained expression of this filter.
`Expression` | `WalkingIterator.getExpression()`
`Expression` | `FilterExprIteratorSimple.getInnerExpression()` Get the inner contained expression of this filter.

Methods in org.apache.xpath.axes with parameters of type Expression
`boolean` | `PredicatedNodeTest.deepEquals(Expression expr)`
`boolean` | `OneStepIteratorForward.deepEquals(Expression expr)`
`boolean` | `HasPositionalPredChecker.visitPredicate(ExpressionOwner owner, Expression pred)` Visit a predicate within a location path.
`boolean` | `UnionPathIterator.deepEquals(Expression expr)`
`void` | `FilterExprIterator.setInnerExpression(Expression expr)` Set the inner contained expression of this filter.
`boolean` | `FilterExprIterator.deepEquals(Expression expr)`
`void` | `AxesWalker.setExpression(Expression exp)`
`boolean` | `AxesWalker.deepEquals(Expression expr)`
`void` | `FilterExprWalker.setInnerExpression(Expression expr)` Set the inner contained expression of this filter.
`boolean` | `FilterExprWalker.deepEquals(Expression expr)`
`void` | `WalkingIterator.setExpression(Expression exp)`
`boolean` | `WalkingIterator.deepEquals(Expression expr)`
`boolean` | `DescendantIterator.deepEquals(Expression expr)`
`boolean` | `OneStepIterator.deepEquals(Expression expr)`
`static XNodeSet` | `FilterExprIteratorSimple.executeFilterExpr(int context, XPathContext xctxt, PrefixResolver prefixResolver, boolean isTopLevel, int stackFrame, Expression expr)` Execute the expression.
`void` | `FilterExprIteratorSimple.setInnerExpression(Expression expr)` Set the inner contained expression of this filter.
`boolean` | `FilterExprIteratorSimple.deepEquals(Expression expr)`

Constructors in org.apache.xpath.axes with parameters of type Expression
`FilterExprIterator.FilterExprIterator(Expression expr)` Create a ChildTestIterator object.
`FilterExprIteratorSimple.FilterExprIteratorSimple(Expression expr)` Create a ChildTestIterator object.

Uses of Expression in org.apache.xpath.compiler

Methods in org.apache.xpath.compiler that return Expression
`Expression` | `Compiler.compile(int opPos)` **For advanced use only** Execute the XPath object from a given opcode position.
`Expression` | `Compiler.locationPath(int opPos)` Compile a location path.
`Expression` | `Compiler.predicate(int opPos)` Compile a location step predicate expression.
`Expression` | `Compiler.locationPathPattern(int opPos)` Compile a location match pattern unit expression.
`Expression[]` | `Compiler.getCompiledPredicates(int opPos)` Compile a zero or more predicates for a given match pattern.

Methods in org.apache.xpath.compiler with parameters of type Expression
`static int` | `FunctionTable.installFunction(java.lang.String name, Expression func)` Install a built-in function.
`static void` | `FunctionTable.installFunction(Expression func, int funcIndex)` Install a function loader at a specific index.

Uses of Expression in org.apache.xpath.functions

Subclasses of Expression in org.apache.xpath.functions
`class` | `FuncBoolean` **For advanced use only** Execute the Boolean() function.
`class` | `FuncCeiling` **For advanced use only** Execute the Ceiling() function.
`class` | `FuncConcat` **For advanced use only** Execute the Concat() function.
`class` | `FuncContains` **For advanced use only** Execute the Contains() function.
`class` | `FuncCount` **For advanced use only** Execute the Count() function.
`class` | `FuncCurrent` **For advanced use only** Execute the current() function.
`class` | `FuncDoclocation` **For advanced use only** Execute the proprietary document-location() function, which returns a node set of documents.
`class` | `FuncExtElementAvailable` **For advanced use only** Execute the ExtElementAvailable() function.
`class` | `FuncExtFunction` **For advanced use only** An object of this class represents an extension call expression.
`class` | `FuncExtFunctionAvailable` **For advanced use only** Execute the ExtFunctionAvailable() function.
`class` | `FuncFalse` **For advanced use only** Execute the False() function.
`class` | `FuncFloor` **For advanced use only** Execute the Floor() function.
`class` | `FuncGenerateId` **For advanced use only** Execute the GenerateId() function.
`class` | `FuncId` **For advanced use only** Execute the Id() function.
`class` | `FuncLang` **For advanced use only** Execute the Lang() function.
`class` | `FuncLast` **For advanced use only** Execute the Last() function.
`class` | `FuncLocalPart` Execute the LocalPart() function.
`class` | `FuncNamespace` **For advanced use only** Execute the Namespace() function.
`class` | `FuncNormalizeSpace` **For advanced use only** Execute the normalize-space() function.
`class` | `FuncNot` **For advanced use only** Execute the Not() function.
`class` | `FuncNumber` **For advanced use only** Execute the Number() function.
`class` | `FuncPosition` **For advanced use only** Execute the Position() function.
`class` | `FuncQname` **For advanced use only** Execute the Qname() function.
`class` | `FuncRound` **For advanced use only** Execute the round() function.
`class` | `FuncStartsWith` **For advanced use only** Execute the StartsWith() function.
`class` | `FuncString` **For advanced use only** Execute the String() function.
`class` | `FuncStringLength` **For advanced use only** Execute the StringLength() function.
`class` | `FuncSubstring` **For advanced use only** Execute the Substring() function.
`class` | `FuncSubstringAfter` **For advanced use only** Execute the SubstringAfter() function.
`class` | `FuncSubstringBefore` **For advanced use only** Execute the SubstringBefore() function.
`class` | `FuncSum` **For advanced use only** Execute the Sum() function.
`class` | `FuncSystemProperty` **For advanced use only** Execute the SystemProperty() function.
`class` | `Function` **For advanced use only** This is a superclass of all XPath functions.
`class` | `Function2Args` **For advanced use only** Base class for functions that accept two arguments.
`class` | `Function3Args` **For advanced use only** Base class for functions that accept three arguments.
`class` | `FunctionDef1Arg` **For advanced use only** Base class for functions that accept one argument that can be defaulted if not specified.
`class` | `FunctionMultiArgs` **For advanced use only** Base class for functions that accept an undetermined number of multiple arguments.
`class` | `FunctionOneArg` **For advanced use only** Base class for functions that accept one argument.
`class` | `FuncTranslate` **For advanced use only** Execute the Translate() function.
`class` | `FuncTrue` **For advanced use only** Execute the True() function.
`class` | `FuncUnparsedEntityURI` **For advanced use only**

Methods in org.apache.xpath.functions that return Expression
`Expression` | `FunctionOneArg.getArg0()` Return the first argument passed to the function (at index 0).
`Expression` | `FunctionOneArg.getExpression()`
`Expression` | `Function2Args.getArg1()` Return the second argument passed to the function (at index 1).
`Expression` | `Function3Args.getArg2()` Return the third argument passed to the function (at index 2).
`Expression[]` | `FunctionMultiArgs.getArgs()` Return an expression array containing arguments at index 3 or greater.
`Expression` | `FuncExtFunction.getArg(int n)` Return the nth argument passed to the extension function.

Methods in org.apache.xpath.functions with parameters of type Expression
`void` | `Function.setArg(Expression arg, int argNum)` Set an argument expression for a function.
`boolean` | `Function.deepEquals(Expression expr)`
`void` | `FunctionOneArg.setArg(Expression arg, int argNum)` Set an argument expression for a function.
`void` | `FunctionOneArg.setExpression(Expression exp)`
`boolean` | `FunctionOneArg.deepEquals(Expression expr)`
`void` | `Function2Args.setArg(Expression arg, int argNum)` Set an argument expression for a function.
`boolean` | `Function2Args.deepEquals(Expression expr)`
`void` | `Function3Args.setArg(Expression arg, int argNum)` Set an argument expression for a function.
`boolean` | `Function3Args.deepEquals(Expression expr)`
`void` | `FunctionMultiArgs.setArg(Expression arg, int argNum)` Set an argument expression for a function.
`boolean` | `FunctionMultiArgs.deepEquals(Expression expr)`
`void` | `FuncExtFunction.setArg(Expression arg, int argNum)` Set an argument expression for a function.

Uses of Expression in org.apache.xpath.objects

Subclasses of Expression in org.apache.xpath.objects
`class` | `XBoolean` **For advanced use only** This class represents an XPath boolean object, and is capable of converting the boolean to other types, such as a string.
`class` | `XBooleanStatic` **For internal use only** This class doesn't have any XPathContext, so override whatever to ensure it works OK.
`class` | `XNodeSet` This class represents an XPath nodeset object, and is capable of converting the nodeset to other types, such as a string.
`class` | `XNodeSetForDOM` This class overrides the XNodeSet#object() method to provide the original Node object, NodeList object, or NodeIterator.
`class` | `XNull` This class represents an XPath null object, and is capable of converting the null to other types, such as a string.
`class` | `XNumber` This class represents an XPath number, and is capable of converting the number to other types, such as a string.
`class` | `XObject` This class represents an XPath object, and is capable of converting the object to various types, such as a string.
`class` | `XRTreeFrag` This class represents an XPath result tree fragment object, and is capable of converting the RTF to other types, such as a string.
`class` | `XRTreeFragSelectWrapper` This class makes an select statement act like an result tree fragment.
`class` | `XString` This class represents an XPath string object, and is capable of converting the string to other types, such as a number.
`class` | `XStringForChars` This class will wrap a FastStringBuffer and allow for
`class` | `XStringForFSB` This class will wrap a FastStringBuffer and allow for

Methods in org.apache.xpath.objects with parameters of type Expression
`boolean` | `XObject.deepEquals(Expression expr)`

Constructors in org.apache.xpath.objects with parameters of type Expression
`XRTreeFrag.XRTreeFrag(Expression expr)` Create an XRTreeFrag Object.
`XRTreeFragSelectWrapper.XRTreeFragSelectWrapper(Expression expr)`

Uses of Expression in org.apache.xpath.operations

Subclasses of Expression in org.apache.xpath.operations
`class` | `And` The 'and' operation expression executer.
`class` | `Bool` The 'boolean()' operation expression executer.
`class` | `Div` The 'div' operation expression executer.
`class` | `Equals` The '=' operation expression executer.
`class` | `Gt` The '>' operation expression executer.
`class` | `Gte` The '>=' operation expression executer.
`class` | `Lt` The '<' operation expression executer.
`class` | `Lte` The '<=' operation expression executer.
`class` | `Minus` The binary '-' operation expression executer.
`class` | `Mod` The 'mod' operation expression executer.
`class` | `Mult` The '*' operation expression executer.
`class` | `Neg` The unary '-' operation expression executer.
`class` | `NotEquals` The '!=' operation expression executer.
`class` | `Number` The 'number()' operation expression executer.
`class` | `Operation` The baseclass for a binary operation.
`class` | `Or` The 'or' operation expression executer.
`class` | `Plus` The '+' operation expression executer.
`class` | `Quo` The 'quo' operation expression executer.
`class` | `String` The 'string()' operation expression executer.
`class` | `UnaryOperation` The unary operation base class.
`class` | `Variable` The variable reference expression executer.
`class` | `VariableSafeAbsRef` This is a "smart" variable reference that is used in situations where an absolute path is optimized into a variable reference, but may be used in some situations where the document context may have changed.

Methods in org.apache.xpath.operations that return Expression
`Expression` | `Operation.getLeftOperand()`
`Expression` | `Operation.getRightOperand()`
`Expression` | `Operation.getExpression()`
`Expression` | `UnaryOperation.getOperand()`
`Expression` | `UnaryOperation.getExpression()`

Methods in org.apache.xpath.operations with parameters of type Expression
`void` | `Operation.setLeftRight(Expression l, Expression r)` Set the left and right operand expressions for this operation.
`void` | `Operation.setExpression(Expression exp)`
`boolean` | `Operation.deepEquals(Expression expr)`
`void` | `UnaryOperation.setRight(Expression r)` Set the expression operand for the operation.
`void` | `UnaryOperation.setExpression(Expression exp)`
`boolean` | `UnaryOperation.deepEquals(Expression expr)`
`boolean` | `Variable.deepEquals(Expression expr)`

Uses of Expression in org.apache.xpath.patterns

Subclasses of Expression in org.apache.xpath.patterns
`class` | `ContextMatchStepPattern` Special context node pattern matcher.
`class` | `FunctionPattern` **For advanced use only** Match pattern step that contains a function.
`class` | `NodeTest` **For advanced use only** This is the basic node test class for both match patterns and location path steps.
`class` | `StepPattern` **For advanced use only** This class represents a single pattern match step.
`class` | `UnionPattern` **For advanced use only** This class represents a union pattern, which can have multiple individual StepPattern patterns.

Methods in org.apache.xpath.patterns that return Expression
`Expression[]` | `StepPattern.getPredicates()` Set the list of predicate expressions for this pattern step.
`Expression` | `StepPattern.getPredicate(int i)` Get a predicate expression.
`Expression` | `StepPattern.getExpression()`

Methods in org.apache.xpath.patterns with parameters of type Expression
`boolean` | `NodeTest.deepEquals(Expression expr)`
`boolean` | `UnionPattern.deepEquals(Expression expr)`
`void` | `StepPattern.setPredicates(Expression[] predicates)` Set the predicates for this match pattern step.
`void` | `StepPattern.setExpression(Expression exp)`
`boolean` | `StepPattern.deepEquals(Expression expr)`

Constructors in org.apache.xpath.patterns with parameters of type Expression
`FunctionPattern.FunctionPattern(Expression expr, int axis, int predaxis)` Construct a FunctionPattern from a expression.

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