File	Doc	Category	Size	Date	Package
Operation.java	API Doc	Java SE 5 API	5540	Fri Aug 26 14:56:10 BST 2005	com.sun.org.apache.xpath.internal.operations

Operation

• java.lang.Object
  • com.sun.org.apache.xpath.internal.Expression

Fields Summary
protected Expression	m_left The left operand expression.
protected Expression	m_right The right operand expression.

Constructors Summary

Methods Summary
public void	callVisitors(com.sun.org.apache.xpath.internal.ExpressionOwner owner, com.sun.org.apache.xpath.internal.XPathVisitor visitor) see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor) if(visitor.visitBinaryOperation(owner, this)) { m_left.callVisitors(new LeftExprOwner(), visitor); m_right.callVisitors(this, visitor); }
public boolean	canTraverseOutsideSubtree() Tell if this expression or it's subexpressions can traverse outside the current subtree. return true if traversal outside the context node's subtree can occur. if (null != m_left && m_left.canTraverseOutsideSubtree()) return true; if (null != m_right && m_right.canTraverseOutsideSubtree()) return true; return false;
public boolean	deepEquals(com.sun.org.apache.xpath.internal.Expression expr) see Expression#deepEquals(Expression) if(!isSameClass(expr)) return false; if(!m_left.deepEquals(((Operation)expr).m_left)) return false; if(!m_right.deepEquals(((Operation)expr).m_right)) return false; return true;
public com.sun.org.apache.xpath.internal.objects.XObject	execute(com.sun.org.apache.xpath.internal.XPathContext xctxt) Execute a binary operation by calling execute on each of the operands, and then calling the operate method on the derived class. param xctxt The runtime execution context. return The XObject result of the operation. throws javax.xml.transform.TransformerException XObject left = m_left.execute(xctxt, true); XObject right = m_right.execute(xctxt, true); XObject result = operate(left, right); left.detach(); right.detach(); return result;
public void	fixupVariables(java.util.Vector vars, int globalsSize) This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time. param vars List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame). m_left.fixupVariables(vars, globalsSize); m_right.fixupVariables(vars, globalsSize);
public com.sun.org.apache.xpath.internal.Expression	getExpression() see ExpressionOwner#getExpression() return m_right;
public com.sun.org.apache.xpath.internal.Expression	getLeftOperand() return the left operand of binary operation, as an Expression. return m_left;
public com.sun.org.apache.xpath.internal.Expression	getRightOperand() return the right operand of binary operation, as an Expression. return m_right;
public com.sun.org.apache.xpath.internal.objects.XObject	operate(com.sun.org.apache.xpath.internal.objects.XObject left, com.sun.org.apache.xpath.internal.objects.XObject right) Apply the operation to two operands, and return the result. param left non-null reference to the evaluated left operand. param right non-null reference to the evaluated right operand. return non-null reference to the XObject that represents the result of the operation. throws javax.xml.transform.TransformerException return null; // no-op
public void	setExpression(com.sun.org.apache.xpath.internal.Expression exp) see ExpressionOwner#setExpression(Expression) exp.exprSetParent(this); m_right = exp;
public void	setLeftRight(com.sun.org.apache.xpath.internal.Expression l, com.sun.org.apache.xpath.internal.Expression r) Set the left and right operand expressions for this operation. param l The left expression operand. param r The right expression operand. m_left = l; m_right = r; l.exprSetParent(this); r.exprSetParent(this);