/** * Is this expression the same as another expression? */ public boolean equals(/*@Nullable*/ Object other) { return other != null && this.getClass().equals(other.getClass()) && this.getBaseExpression().isEqual(((UnaryExpression) other).getBaseExpression()); }
/** * Is this expression the same as another expression? */ public boolean equals(/*@Nullable*/ Object other) { return other != null && this.getClass().equals(other.getClass()) && this.getBaseExpression().isEqual(((UnaryExpression) other).getBaseExpression()); }
/** * get HashCode for comparing two expressions. Note that this hashcode gives the same * result for (A op B) and for (B op A), whether or not the operator is commutative. */ public int computeHashCode() { return ("UnaryExpression " + getClass()).hashCode() ^ getBaseExpression().hashCode(); }
/** * Determine the data type of the expression, if possible. The default * implementation for unary expressions returns the item type of the operand * * @return the item type of the items in the result sequence, insofar as this * is known statically. */ /*@NotNull*/ public ItemType getItemType() { return getBaseExpression().getItemType(); }
/** * Get the static properties of this expression (other than its type). The result is * bit-signficant. These properties are used for optimizations. In general, if * property bit is set, it is true, but if it is unset, the value is unknown. */ public int computeSpecialProperties() { return getBaseExpression().getSpecialProperties(); }
/** * Get the static properties of this expression (other than its type). The result is * bit-signficant. These properties are used for optimizations. In general, if * property bit is set, it is true, but if it is unset, the value is unknown. */ public int computeSpecialProperties() { return getBaseExpression().getSpecialProperties(); }
/** * The toString() method for an expression attempts to give a representation of the expression * in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath. * In the case of XSLT instructions, the toString() method gives an abstracted view of the syntax */ public String toString() { return getExpressionName() + "(" + getBaseExpression() + ")"; }
/** * Determine the static cardinality. Default implementation returns the cardinality of the operand */ public int computeCardinality() { return getBaseExpression().getCardinality(); }
/** * Determine the data type of the expression, if possible. The default * implementation for unary expressions returns the item type of the operand * * @return the item type of the items in the result sequence, insofar as this * is known statically. */ /*@NotNull*/ public ItemType getItemType() { return getBaseExpression().getItemType(); }
/** * get HashCode for comparing two expressions. Note that this hashcode gives the same * result for (A op B) and for (B op A), whether or not the operator is commutative. */ public int computeHashCode() { return ("UnaryExpression " + getClass()).hashCode() ^ getBaseExpression().hashCode(); }
/** * The toString() method for an expression attempts to give a representation of the expression * in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath. * In the case of XSLT instructions, the toString() method gives an abstracted view of the syntax */ public String toString() { return getExpressionName() + "(" + getBaseExpression() + ")"; }
/** * Determine the static cardinality. Default implementation returns the cardinality of the operand */ public int computeCardinality() { return getBaseExpression().getCardinality(); }
public AbstractExpression exprFor (UnaryExpression expr) { return exprFor (expr.getBaseExpression()); }
@Override public String toShortString() { return getExpressionName() + "(" + getBaseExpression().toShortString() + ")"; }
@Override public String toShortString() { return getExpressionName() + "(" + getBaseExpression().toShortString() + ")"; }
/** * Perform optimisation of an expression and its subexpressions. * <p>This method is called after all references to functions and variables have been resolved * to the declaration of the function or variable, and after all type checking has been done.</p> * * @param visitor an expression visitor * @param contextInfo the static type of "." at the point where this expression is invoked. * The parameter is set to null if it is known statically that the context item will be undefined. * If the type of the context item is not known statically, the argument is set to * {@link net.sf.saxon.type.Type#ITEM_TYPE} * @return the original expression, rewritten if appropriate to optimize execution * @throws XPathException if an error is discovered during this phase * (typically a type error) */ /*@NotNull*/ public Expression optimize(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException { operand.optimize(visitor, contextInfo); // if the operand value is known, pre-evaluate the expression Expression base = getBaseExpression(); try { if (base instanceof Literal) { return Literal.makeLiteral( iterate(visitor.getStaticContext().makeEarlyEvaluationContext()).materialize(), this); } } catch (XPathException err) { // if early evaluation fails, suppress the error: the value might // not be needed at run-time } return this; }
/** * Type-check the expression. Default implementation for unary operators that accept * any kind of operand */ /*@NotNull*/ public Expression typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException { operand.typeCheck(visitor, contextInfo); // if the operand value is known, pre-evaluate the expression try { if (getBaseExpression() instanceof Literal) { Expression e2 = Literal.makeLiteral( iterate(visitor.getStaticContext().makeEarlyEvaluationContext()).materialize(), this); ExpressionTool.copyLocationInfo(this, e2); return e2; } //return (Value)ExpressionTool.eagerEvaluate(this, env.makeEarlyEvaluationContext()); } catch (Exception err) { // if early evaluation fails, suppress the error: the value might // not be needed at run-time } return this; }
/** * Type-check the expression. Default implementation for unary operators that accept * any kind of operand */ /*@NotNull*/ public Expression typeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo) throws XPathException { operand.typeCheck(visitor, contextInfo); // if the operand value is known, pre-evaluate the expression try { if (getBaseExpression() instanceof Literal) { Expression e2 = Literal.makeLiteral( iterate(visitor.getStaticContext().makeEarlyEvaluationContext()).materialize(), this); ExpressionTool.copyLocationInfo(this, e2); return e2; } //return (Value)ExpressionTool.eagerEvaluate(this, env.makeEarlyEvaluationContext()); } catch (Exception err) { // if early evaluation fails, suppress the error: the value might // not be needed at run-time } return this; }
/** * Diagnostic print of expression structure. The abstract expression tree * is written to the supplied output destination. */ public void export(ExpressionPresenter out) throws XPathException { String name = getExpressionName(); if (name == null) { out.startElement("unaryOperator", this); String op = displayOperator(out.getConfiguration()); if (op != null) { out.emitAttribute("op", op); } } else { out.startElement(name, this); } getBaseExpression().export(out); out.endElement(); }
/** * Diagnostic print of expression structure. The abstract expression tree * is written to the supplied output destination. */ public void export(ExpressionPresenter out) throws XPathException { String name = getExpressionName(); if (name == null) { out.startElement("unaryOperator", this); String op = displayOperator(out.getConfiguration()); if (op != null) { out.emitAttribute("op", op); } } else { out.startElement(name, this); } getBaseExpression().export(out); out.endElement(); }