19f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 29f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one 39f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or more contributor license agreements. See the NOTICE file 49f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed with this work for additional information 59f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * regarding copyright ownership. The ASF licenses this file 69f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to you under the Apache License, Version 2.0 (the "License"); 79f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * you may not use this file except in compliance with the License. 89f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * You may obtain a copy of the License at 99f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Unless required by applicable law or agreed to in writing, software 139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * See the License for the specific language governing permissions and 169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * limitations under the License. 179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * $Id: Operation.java 468655 2006-10-28 07:12:06Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xpath.operations; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.Expression; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.ExpressionOwner; 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathContext; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathVisitor; 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XObject; 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * The baseclass for a binary operation. 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class Operation extends Expression implements ExpressionOwner 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson static final long serialVersionUID = -3037139537171050430L; 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** The left operand expression. 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @serial */ 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson protected Expression m_left; 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** The right operand expression. 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @serial */ 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson protected Expression m_right; 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * This function is used to fixup variables from QNames to stack frame 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * indexes at stylesheet build time. 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param vars List of QNames that correspond to variables. This list 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * should be searched backwards for the first qualified name that 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * corresponds to the variable reference qname. The position of the 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * QName in the vector from the start of the vector will be its position 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * in the stack frame (but variables above the globalsTop value will need 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to be offset to the current stack frame). 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void fixupVariables(java.util.Vector vars, int globalsSize) 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_left.fixupVariables(vars, globalsSize); 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_right.fixupVariables(vars, globalsSize); 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Tell if this expression or it's subexpressions can traverse outside 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * the current subtree. 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return true if traversal outside the context node's subtree can occur. 669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean canTraverseOutsideSubtree() 689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 699f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 709f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if (null != m_left && m_left.canTraverseOutsideSubtree()) 719f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 729f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 739f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if (null != m_right && m_right.canTraverseOutsideSubtree()) 749f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 759f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 769f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return false; 779f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 789f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 799f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 809f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Set the left and right operand expressions for this operation. 819f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 829f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 839f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param l The left expression operand. 849f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param r The right expression operand. 859f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 869f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void setLeftRight(Expression l, Expression r) 879f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 889f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_left = l; 899f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_right = r; 909f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson l.exprSetParent(this); 919f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson r.exprSetParent(this); 929f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 939f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 949f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 959f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Execute a binary operation by calling execute on each of the operands, 969f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * and then calling the operate method on the derived class. 979f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 989f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 999f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param xctxt The runtime execution context. 1009f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1019f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return The XObject result of the operation. 1029f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1039f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 1049f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1059f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public XObject execute(XPathContext xctxt) 1069f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson throws javax.xml.transform.TransformerException 1079f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1089f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1099f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson XObject left = m_left.execute(xctxt, true); 1109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson XObject right = m_right.execute(xctxt, true); 1119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson XObject result = operate(left, right); 1139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson left.detach(); 1149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson right.detach(); 1159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return result; 1169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Apply the operation to two operands, and return the result. 1209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param left non-null reference to the evaluated left operand. 1239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param right non-null reference to the evaluated right operand. 1249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return non-null reference to the XObject that represents the result of the operation. 1269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 1279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 1289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public XObject operate(XObject left, XObject right) 1309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson throws javax.xml.transform.TransformerException 1319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return null; // no-op 1339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** @return the left operand of binary operation, as an Expression. 1369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public Expression getLeftOperand(){ 1389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_left; 1399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** @return the right operand of binary operation, as an Expression. 1429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public Expression getRightOperand(){ 1449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_right; 1459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson class LeftExprOwner implements ExpressionOwner 1489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see ExpressionOwner#getExpression() 1519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public Expression getExpression() 1539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_left; 1559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see ExpressionOwner#setExpression(Expression) 1599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void setExpression(Expression exp) 1619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson exp.exprSetParent(Operation.this); 1639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_left = exp; 1649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see org.apache.xpath.XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor) 1699f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1709f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void callVisitors(ExpressionOwner owner, XPathVisitor visitor) 1719f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1729f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(visitor.visitBinaryOperation(owner, this)) 1739f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1749f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_left.callVisitors(new LeftExprOwner(), visitor); 1759f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_right.callVisitors(this, visitor); 1769f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1779f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1789f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1799f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1809f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see ExpressionOwner#getExpression() 1819f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1829f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public Expression getExpression() 1839f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1849f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return m_right; 1859f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1869f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1879f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1889f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see ExpressionOwner#setExpression(Expression) 1899f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1909f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public void setExpression(Expression exp) 1919f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 1929f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson exp.exprSetParent(this); 1939f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson m_right = exp; 1949f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 1959f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 1969f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 1979f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @see Expression#deepEquals(Expression) 1989f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 1999f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public boolean deepEquals(Expression expr) 2009f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 2019f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(!isSameClass(expr)) 2029f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return false; 2039f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 2049f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(!m_left.deepEquals(((Operation)expr).m_left)) 2059f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return false; 2069f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 2079f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson if(!m_right.deepEquals(((Operation)expr).m_right)) 2089f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return false; 2099f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 2109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return true; 2119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 2129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 213