org.apache.xalan.xsltc.compiler
Class Step

java.lang.Object
  org.apache.xalan.xsltc.compiler.SyntaxTreeNode
      org.apache.xalan.xsltc.compiler.Expression
          org.apache.xalan.xsltc.compiler.RelativeLocationPath
              org.apache.xalan.xsltc.compiler.Step

All Implemented Interfaces:

Constants

final class Step
extends RelativeLocationPath

Field Summary

private int	_axis This step's axis as defined in class Axis.
private boolean	_hadPredicates Some simple predicates can be handled by this class (and not by the Predicate class) and will be removed from the above vector as they are handled.
private int	_nodeType Type of the node test.
private java.util.Vector	_predicates A vector of predicates (filters) defined on this step - may be null

Fields inherited from class org.apache.xalan.xsltc.compiler.Expression

_falseList, _trueList, _type

Fields inherited from class org.apache.xalan.xsltc.compiler.SyntaxTreeNode

_attributes, _parent, _qname, Dummy, IndentIncrement, UNKNOWN_STYLESHEET_NODE_ID

Fields inherited from interface org.apache.xalan.xsltc.compiler.Constants

ABSOLUTE_ITERATOR, ACC_FINAL, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_SUPER, ADD_ATTRIBUTE, ADD_ATTRIBUTE_SIG, ADD_ITERATOR, ADD_ITERATOR_SIG, ADD_PARAMETER, ADD_PARAMETER_SIG, APPLY_TEMPLATES, ATTR_SET_SIG, ATTRIBUTE_LIST_FIELD, ATTRIBUTE_LIST_IMPL_CLASS, ATTRIBUTE_LIST_IMPL_SIG, ATTRIBUTES_SIG, BASIS_LIBRARY_CLASS, BOOLEAN_CLASS, BOOLEAN_VALUE, BOOLEAN_VALUE_SIG, CACHED_NODE_LIST_ITERATOR_CLASS, CHARACTERS, CHARACTERS_SIG, CHARACTERSW, CHARACTERSW_SIG, CLEAR_ATTRIBUTES, CLEAR_ATTRIBUTES_SIG, COLLATOR_CLASS, COLLATOR_SIG, COMPILER_PACKAGE, CURRENT_NODE_LIST_FILTER, CURRENT_NODE_LIST_FILTER_SIG, CURRENT_NODE_LIST_ITERATOR, CURRENT_NODE_LIST_ITERATOR_SIG, DEFAULT_NODE_COUNTER, DEFAULT_NODE_COUNTER_SIG, DOCUMENT_PNAME, DOM_ADAPTER_CLASS, DOM_ADAPTER_SIG, DOM_FIELD, DOM_IMPL, DOM_IMPL_CLASS, DOM_IMPL_SIG, DOM_INTF, DOM_INTF_SIG, DOM_PNAME, DOUBLE_CLASS, DOUBLE_SIG, DOUBLE_VALUE, DOUBLE_VALUE_SIG, DUP_FILTERED_ITERATOR, EMPTYATTR_FIELD, EMPTYSTRING, ERROR, EXPAND_STYLESHEET_QNAME_REF, EXPAND_STYLESHEET_QNAME_SIG, FALLBACK_CLASS, FATAL, FILTER_INTERFACE, FILTER_INTERFACE_SIG, FILTER_ITERATOR, FILTER_STEP_ITERATOR, FORMAT_SYMBOLS_FIELD, GET_ATTRIBUTE_VALUE, GET_ATTRIBUTE_VALUE_SIG, GET_CHILDREN, GET_CHILDREN_SIG, GET_ELEMENT_VALUE, GET_ELEMENT_VALUE_SIG, GET_ITERATOR_SIG, GET_NODE_NAME, GET_NODE_NAME_SIG, GET_NODE_TYPE, GET_NODE_TYPE_SIG, GET_NODE_VALUE, GET_NODE_VALUE_ITERATOR, GET_NODE_VALUE_ITERATOR_SIG, GET_NODE_VALUE_SIG, GET_PARAMETER, GET_PARAMETER_SIG, GET_PARENT, GET_PARENT_SIG, GET_TYPED_CHILDREN, GET_TYPED_CHILDREN_SIG, GET_UNPARSED_ENTITY_URI, GET_UNPARSED_ENTITY_URI_SIG, HAS_ATTRIBUTE, HAS_ATTRIBUTE_SIG, HASIDCALL_INDEX, HASIDCALL_INDEX_SIG, INT_VALUE, INT_VALUE_SIG, INTEGER_CLASS, INTEGER_SIG, INTERNAL, INVOKE_METHOD, ITERATOR_FIELD_SIG, ITERATOR_PNAME, KEY_INDEX_CLASS, KEY_INDEX_ITERATOR_SIG, KEY_INDEX_SIG, LAST_INDEX, LOAD_DOCUMENT_CLASS, LOCALE_CLASS, LOCALE_SIG, LOOKUP_STYLESHEET_QNAME_NS_REF, LOOKUP_STYLESHEET_QNAME_NS_SIG, MAKE_NODE, MAKE_NODE_LIST, MAKE_NODE_LIST_SIG, MAKE_NODE_LIST_SIG2, MAKE_NODE_SIG, MAKE_NODE_SIG2, MATCHING_ITERATOR, MATH_CLASS, MULTI_DOM_CLASS, MULTI_DOM_SIG, NAMES_INDEX, NAMES_INDEX_SIG, NAMESPACE_FEATURE, NAMESPACE_INDEX, NAMESPACE_INDEX_SIG, NEXT, NEXT_SIG, NEXTID, NODE, NODE_COUNTER, NODE_COUNTER_SIG, NODE_FIELD, NODE_FIELD_SIG, NODE_ITERATOR, NODE_ITERATOR_BASE, NODE_ITERATOR_SIG, NODE_PNAME, NODE_SIG, NODE_SORT_FACTORY, NODE_SORT_FACTORY_SIG, NODE_SORT_RECORD, NODE_SORT_RECORD_SIG, NS_ANCESTORS_INDEX_SIG, NTH_ITERATOR_CLASS, OBJECT_CLASS, OBJECT_SIG, ORDER_ITERATOR, ORDER_ITERATOR_SIG, OUTPUT_BASE, OUTPUT_HANDLER, OUTPUT_HANDLER_SIG, POP_PARAM_FRAME, POP_PARAM_FRAME_SIG, POSITION_INDEX, PREFIX_URIS_ARRAY_SIG, PREFIX_URIS_IDX_SIG, PUSH_PARAM_FRAME, PUSH_PARAM_FRAME_SIG, REDIRECT_URI, RESET, RESET_SIG, RTF_INITIAL_SIZE, RUNTIME_NODE_CLASS, RUNTIME_PACKAGE, SAX_IMPL, SAX_IMPL_CLASS, SAX_IMPL_SIG, SET_START_NODE, SET_START_NODE_SIG, SINGLETON_ITERATOR, SORT_ITERATOR, SORT_ITERATOR_SIG, STATIC_CHAR_DATA_FIELD, STATIC_CHAR_DATA_FIELD_SIG, STATIC_NAMES_ARRAY_FIELD, STATIC_NAMESPACE_ARRAY_FIELD, STATIC_NS_ANCESTORS_ARRAY_FIELD, STATIC_PREFIX_URIS_ARRAY_FIELD, STATIC_PREFIX_URIS_IDX_ARRAY_FIELD, STATIC_TYPES_ARRAY_FIELD, STATIC_URIS_ARRAY_FIELD, STEP_ITERATOR_CLASS, STREAM_XML_OUTPUT, STRING, STRING_BUFFER_CLASS, STRING_BUFFER_SIG, STRING_CLASS, STRING_SIG, STRING_TO_INT, STRING_TO_INT_SIG, STRING_TO_REAL, STRING_TO_REAL_SIG, STRING_VALUE_HANDLER, STRING_VALUE_HANDLER_SIG, STRING_WRITER, STRIP_SPACE, STRIP_SPACE_INTF, STRIP_SPACE_PARAMS, STRIP_SPACE_SIG, TRANSLET_CLASS, TRANSLET_FIELD, TRANSLET_FIELD_SIG, TRANSLET_INTF, TRANSLET_INTF_SIG, TRANSLET_OUTPUT_BASE, TRANSLET_OUTPUT_INTERFACE, TRANSLET_OUTPUT_PNAME, TRANSLET_OUTPUT_SIG, TRANSLET_PNAME, TRANSLET_SIG, TRANSLET_URI, TRANSLET_VERSION_INDEX, TRANSLET_VERSION_INDEX_SIG, TYPES_INDEX, TYPES_INDEX_SIG, UNION_ITERATOR_CLASS, UNION_ITERATOR_SIG, UNSUPPORTED, URIS_INDEX, URIS_INDEX_SIG, WARNING, WRITER_SIG, XHTML_URI, XMLNS_PREFIX, XMLNS_STRING, XMLNS_URI, XSLT_PACKAGE, XSLT_URI

Constructor Summary

Step(int axis, int nodeType, java.util.Vector predicates)

Method Summary

void	addPredicates(java.util.Vector predicates) Returns the vector containing all predicates for this step.
int	getAxis() Define the axis (defined in Axis class) for this step
int	getNodeType() Returns the node-type for this step
java.util.Vector	getPredicates() Returns the vector containing all predicates for this step.
private boolean	hasParentPattern() Returns 'true' if this step has a parent pattern.
private boolean	hasPredicates() Returns 'true' if this step has any predicates
boolean	isAbbreviatedDDot() True if this step is the abbreviated step '..'
boolean	isAbbreviatedDot() True if this step is the abbreviated step '.'
private boolean	isPredicate() Returns 'true' if this step is used within a predicate
void	setAxis(int axis) Get the axis (defined in Axis class) for this step
void	setParser(Parser parser) Set the parser for this element and all child predicates
java.lang.String	toString() Returns a string representation of this step.
void	translate(ClassGenerator classGen, MethodGenerator methodGen) Translate a step by pushing the appropriate iterator onto the stack.
void	translatePredicates(ClassGenerator classGen, MethodGenerator methodGen) Translate a sequence of predicates.
Type	typeCheck(SymbolTable stable) Type check this step.

Methods inherited from class org.apache.xalan.xsltc.compiler.Expression

backPatchFalseList, backPatchTrueList, compile, desynthesize, evaluateAtCompileTime, getFalseList, getTrueList, getType, hasLastCall, hasPositionCall, lookupPrimop, startIterator, synthesize, translateDesynthesized

Methods inherited from class org.apache.xalan.xsltc.compiler.SyntaxTreeNode

addAttribute, addElement, addPrefixMapping, compileResultTree, contextDependent, dependentContents, display, displayContents, elementAt, elementCount, elements, getAttribute, getAttribute, getAttributes, getContents, getImportPrecedence, getLineNumber, getNodeIDForStylesheetNSLookup, getParent, getParser, getPrefixMapping, getQName, getStylesheet, getSymbolTable, getTemplate, getXSLTC, hasAttribute, hasContents, indent, isDummy, lastChild, lookupNamespace, lookupPrefix, parseChildren, parseContents, removeElement, reportError, reportWarning, setAttributes, setFirstElement, setLineNumber, setParent, setPrefixMapping, setQName, setQName, translateContents, typeCheckContents, updateScope

Methods inherited from class java.lang.Object

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

Field Detail

_axis

private int _axis

This step's axis as defined in class Axis.

_predicates

private java.util.Vector _predicates

A vector of predicates (filters) defined on this step - may be null

_hadPredicates

private boolean _hadPredicates

Some simple predicates can be handled by this class (and not by the Predicate class) and will be removed from the above vector as they are handled. We use this boolean to remember if we did have any predicates.

_nodeType

private int _nodeType

Type of the node test.

Constructor Detail

Step

public Step(int axis,
            int nodeType,
            java.util.Vector predicates)

Method Detail

setParser

public void setParser(Parser parser)

Set the parser for this element and all child predicates

Overrides:

setParser in class SyntaxTreeNode

Parameters:

parser - The XSLT parser.

getAxis

public int getAxis()

Define the axis (defined in Axis class) for this step

Specified by:

getAxis in class RelativeLocationPath

setAxis

public void setAxis(int axis)

Get the axis (defined in Axis class) for this step

Specified by:

setAxis in class RelativeLocationPath

getNodeType

public int getNodeType()

Returns the node-type for this step

getPredicates

public java.util.Vector getPredicates()

Returns the vector containing all predicates for this step.

addPredicates

public void addPredicates(java.util.Vector predicates)

Returns the vector containing all predicates for this step.

hasParentPattern

private boolean hasParentPattern()

Returns 'true' if this step has a parent pattern. This method will return 'false' if this step occurs on its own under an element like or .

hasPredicates

private boolean hasPredicates()

Returns 'true' if this step has any predicates

isPredicate

private boolean isPredicate()

Returns 'true' if this step is used within a predicate

isAbbreviatedDot

public boolean isAbbreviatedDot()

True if this step is the abbreviated step '.'

isAbbreviatedDDot

public boolean isAbbreviatedDDot()

True if this step is the abbreviated step '..'

typeCheck

public Type typeCheck(SymbolTable stable)
               throws TypeCheckError

Type check this step. The abbreviated steps '.' and '@attr' are assigned type node if they have no predicates. All other steps have type node-set.

Overrides:

typeCheck in class Expression

Parameters:

stable - The compiler/parser's symbol table

Throws:

TypeCheckError

translate

public void translate(ClassGenerator classGen,
                      MethodGenerator methodGen)

Translate a step by pushing the appropriate iterator onto the stack. The abbreviated steps '.' and '@attr' do not create new iterators if they are not part of a LocationPath and have no filters. In these cases a node index instead of an iterator is pushed onto the stack.

Overrides:

translate in class Expression

Parameters:

classGen - BCEL Java class generator

methodGen - BCEL Java method generator

translatePredicates

public void translatePredicates(ClassGenerator classGen,
                                MethodGenerator methodGen)

Translate a sequence of predicates. Each predicate is translated by constructing an instance of CurrentNodeListIterator which is initialized from another iterator (recursive call), a filter and a closure (call to translate on the predicate) and "this".

toString

public java.lang.String toString()

Returns a string representation of this step.

Specified by:

toString in class Expression