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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
class ComposeExpr extends ConvertibleNodeSetExpr {
private final ConvertibleNodeSetExpr expr1;
private final ConvertibleNodeSetExpr expr2;
ComposeExpr(ConvertibleNodeSetExpr expr1, ConvertibleNodeSetExpr expr2) {
this.expr1 = expr1;
this.expr2 = expr2;
}
public NodeIterator eval(Node node, ExprContext context) throws XSLException {
NodeIterator iter = expr1.eval(node, context);
NodeIterator[] iters = new NodeIterator[10];
int length = 0;
for (;;) {
Node tem = iter.next();
if (tem == null)
break;
if (length == iters.length) {
NodeIterator[] oldIters = iters;
iters = new NodeIterator[oldIters.length * 2];
System.arraycopy(oldIters, 0, iters, 0, oldIters.length);
}
iters[length++] = expr2.eval(tem, context);
}
switch (length) {
case 0:
return new NullNodeIterator();
case 1:
return iters[0];
case 2:
return new UnionNodeIterator(iters[0], iters[1]);
}
return new MergeNodeIterator(iters, length);
}
int getOptimizeFlags() {
return expr1.getOptimizeFlags() & expr2.getOptimizeFlags();
}
}
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