com.saxonica.bytecode
Class SimpleNodeConstructorCompiler

java.lang.Object
  com.saxonica.bytecode.ExpressionCompiler
      com.saxonica.bytecode.ToIteratorCompiler
          com.saxonica.bytecode.ToPushCompiler
              com.saxonica.bytecode.SimpleNodeConstructorCompiler

Direct Known Subclasses:

CommentCompiler, NamespaceConstructorCompiler, ProcessingInstructionCompiler, ValueOfCompiler

public abstract class SimpleNodeConstructorCompiler
extends ToPushCompiler

Constructor Summary

SimpleNodeConstructorCompiler()

Method Summary

protected void	checkContent(CompilerService compiler, Expression expression) Compile code to check the content of the node, and adjust it if necessary On entry the proposed content is on the stack as a CharSequence; on exit the revised content must be on the stack as a CharSequence.
protected void	compileNodeName(CompilerService compiler, Expression expression) Compile code to generate the node name (if any) and leave it on the top of the stack.
void	compileToItem(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression as an Item Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression in push mode Precondition: none.
protected boolean	isNamedNodeKind() Ask whether this instruction generates a kind of node that is named
protected boolean	isNoNodeIfEmpty(Expression expr) Overridable method to ask whether no node should be produced in the case that the content is empty
protected abstract void	pushNode(CompilerService compiler, Expression expression) Generate code to write the node to the current receiver.

Methods inherited from class com.saxonica.bytecode.ToPushCompiler

compileToIterator

Methods inherited from class com.saxonica.bytecode.ToIteratorCompiler

compileToBoolean

Methods inherited from class com.saxonica.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileItemFromString, compileToLoop, compileToPrimitive, generateMethod, getConfiguration, handleEmptyStringResult, setConfiguration, throwXPathException, throwXPathException, unboxItem, verify, visitAnnotation, visitLineNumber

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleNodeConstructorCompiler

public SimpleNodeConstructorCompiler()

Method Detail

compileToPush

public void compileToPush(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression in push mode Precondition: none. Postcondition: at execution time, the stack is unchanged, and the value of the expression has been written to the current receiver

Overrides:

compileToPush in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException

isNoNodeIfEmpty

protected boolean isNoNodeIfEmpty(Expression expr)

Overridable method to ask whether no node should be produced in the case that the content is empty

Returns:

true if the rules for this instruction are that when the content is empty, no node is generated

checkContent

protected void checkContent(CompilerService compiler,
                            Expression expression)

Compile code to check the content of the node, and adjust it if necessary On entry the proposed content is on the stack as a CharSequence; on exit the revised content must be on the stack as a CharSequence.

Parameters:

compiler -

expression -

compileNodeName

protected void compileNodeName(CompilerService compiler,
                               Expression expression)
                        throws CannotCompileException

Compile code to generate the node name (if any) and leave it on the top of the stack. For node kinds that are always unnamed (such as comments), the stack is not changed. For node kinds that may be named or unnamed (namespace nodes), an entry is always added to the stack, which will be "" if the particular node has no name.

Throws:

CannotCompileException

pushNode

protected abstract void pushNode(CompilerService compiler,
                                 Expression expression)

Generate code to write the node to the current receiver. On entry the stack holds the current receiver, the node name (for named node kinds only) and the content (for all nodes), in general as instances of CharSequence

Parameters:

compiler -

expression -

isNamedNodeKind

protected boolean isNamedNodeKind()

Ask whether this instruction generates a kind of node that is named

compileToItem

public void compileToItem(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression as an Item Precondition: none. Postcondition: at execution time, the stack contains either an item (the result of the expression), or null (representing an empty sequence).

Overrides:

compileToItem in class ToPushCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException