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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
public abstract class VariantBase implements Variant {
public Variant makePermanent() throws XSLException { return this; }
public NodeIterator convertToNodeSet() throws XSLException {
throw new XSLException("cannot convert to node-set");
}
public double convertToNumber() throws XSLException {
return Converter.toNumber(convertToString());
}
public boolean convertToPredicate(ExprContext context) throws XSLException {
return convertToBoolean();
}
public boolean isBoolean() { return false; }
public boolean isNumber() { return false; }
public boolean isString() { return false; }
public boolean isNodeSet() { return false; }
static public Variant create(Object obj) {
if (obj instanceof String)
return new StringVariant((String)obj);
if (obj instanceof Number)
return new NumberVariant(((Number)obj).doubleValue());
if (obj instanceof Boolean)
return new BooleanVariant(((Boolean)obj).booleanValue());
if (obj instanceof NodeIterator)
return new NodeSetVariant((NodeIterator)obj);
if (obj instanceof Node)
return new NodeSetVariant(new SingleNodeIterator((Node)obj));
if (obj instanceof Variant)
return (Variant)obj;
return new ObjectVariant(obj);
}
public Node getBaseNode() {
return null;
}
}
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