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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
import java.net.URL;
class DocumentFunction implements Function {
public ConvertibleExpr makeCallExpr(ConvertibleExpr args[], final Node exprNode)
throws ParseException {
if (args.length != 1 && args.length != 2)
throw new ParseException("expected one or two arguments");
ConvertibleExpr e = args[0];
final NodeSetExpr base = (args.length == 1
? null
: args[1].makeNodeSetExpr());
if (e instanceof NodeSetExpr) {
final NodeSetExpr nse = (NodeSetExpr)e;
return new ConvertibleNodeSetExpr() {
public NodeIterator eval(Node node, ExprContext context) throws XSLException {
return document(context,
nse.eval(node, context),
base == null
? null
: base.eval(node, context).next());
}
};
}
else if (e instanceof VariantExpr) {
final VariantExpr ve = (VariantExpr)e;
return new ConvertibleNodeSetExpr() {
public NodeIterator eval(Node node, ExprContext context) throws XSLException {
Variant v = ve.eval(node, context);
if (v.isNodeSet())
return document(context,
v.convertToNodeSet(),
base == null
? null
: base.eval(node, context).next());
else {
Node baseNode = v.getBaseNode();
if (baseNode == null)
baseNode = exprNode;
return document(context,
v.convertToString(),
base == null
? baseNode
: base.eval(node, context).next());
}
}
};
}
else {
final StringExpr se = e.makeStringExpr();
return new ConvertibleNodeSetExpr() {
public NodeIterator eval(Node node, ExprContext context)
throws XSLException {
return document(context,
se.eval(node, context),
base == null
? exprNode
: base.eval(node, context).next());
}
};
}
}
private static final NodeIterator document(ExprContext context, NodeIterator iter, Node baseNode) throws XSLException {
NodeIterator[] iters = new NodeIterator[1];
int len = 0;
for (;;) {
Node node = iter.next();
if (node == null)
break;
if (len == iters.length) {
NodeIterator[] oldIters = iters;
iters = new NodeIterator[iters.length*2];
System.arraycopy(oldIters, 0, iters, 0, oldIters.length);
}
iters[len++] = document(context,
Converter.toString(node),
baseNode == null ? node : baseNode);
}
if (len > 1)
return new MergeNodeIterator(iters, len);
if (len == 1)
return iters[0];
return new SingleNodeIterator(null);
}
private static final NodeIterator document(ExprContext context, String urlRef, Node baseNode) throws XSLException {
return context.getDocument(baseNode == null ? null : baseNode.getURL(),
urlRef);
}
}
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