package com.jclark.xsl.tr;

import com.jclark.xsl.om.*;
import com.jclark.xsl.expr.VariantExpr;
import com.jclark.xsl.expr.Variant;
import com.jclark.xsl.expr.ExprContext;
import java.util.Hashtable;

abstract class ParamAction implements Action {
  private Name[] paramNames = null;
  private VariantExpr[] paramExprs = null;

  void addParam(Name name, VariantExpr expr) {
    if (paramNames == null) {
      paramNames = new Name[]{name};
      paramExprs = new VariantExpr[]{expr};
    }
    else {
      Name[] oldParamNames = paramNames;
      paramNames = new Name[oldParamNames.length + 1];
      System.arraycopy(oldParamNames, 0, paramNames, 0, oldParamNames.length);
      paramNames[oldParamNames.length] = name;
      VariantExpr[] oldParamExprs = paramExprs;
      paramExprs = new VariantExpr[oldParamExprs.length + 1];
      System.arraycopy(oldParamExprs, 0, paramExprs, 0, oldParamExprs.length);
      paramExprs[oldParamExprs.length] = expr;
    }
  }

  Name[] getParamNames() {
    return paramNames;
  }

  Variant[] getParamValues(Node sourceNode, ExprContext context) throws XSLException {
    if (paramExprs == null)
      return null;
    Variant[] paramValues = new Variant[paramExprs.length];
    for (int i = 0; i < paramValues.length; i++)
      paramValues[i] = paramExprs[i].eval(sourceNode, context).makePermanent();
    return paramValues;
  }
}