File: FilterExpr.java

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lib-xt-java 0.19990725-1
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package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

class FilterExpr extends ConvertibleNodeSetExpr {
  private final ConvertibleNodeSetExpr expr;
  private final BooleanExpr predicate;

  FilterExpr(ConvertibleNodeSetExpr expr, BooleanExpr predicate) {
    this.expr = expr;
    this.predicate = predicate;
  }

  public NodeIterator eval(Node node, ExprContext context) throws XSLException {
    return new FilterNodeIterator(expr.eval(node, context),
				  context,
				  predicate);
  }
  /* OPT: if the expr is of the form position()=n,
     then SINGLE_LEVEL must be true */
  int getOptimizeFlags() {
    return expr.getOptimizeFlags();
  }
}