001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.dbutils; 018 019 import java.lang.reflect.InvocationHandler; 020 import java.lang.reflect.Method; 021 import java.sql.ResultSetMetaData; 022 023 /** 024 * MockResultSetMetaData dynamically implements the ResultSetMetaData 025 * interface. 026 */ 027 public class MockResultSetMetaData implements InvocationHandler { 028 029 private String[] columnNames = null; 030 031 /** 032 * Create a <code>MockResultSetMetaData</code> proxy object. This is 033 * equivalent to: 034 * <pre> 035 * ProxyFactory.instance().createResultSetMetaData(new MockResultSetMetaData(columnNames)); 036 * </pre> 037 * 038 * @param columnNames 039 * @return the proxy object 040 */ 041 public static ResultSetMetaData create(String[] columnNames) { 042 return ProxyFactory.instance().createResultSetMetaData( 043 new MockResultSetMetaData(columnNames)); 044 } 045 046 public MockResultSetMetaData(String[] columnNames) { 047 super(); 048 this.columnNames = columnNames; 049 050 } 051 052 public Object invoke(Object proxy, Method method, Object[] args) 053 throws Throwable { 054 055 String methodName = method.getName(); 056 057 if (methodName.equals("getColumnCount")) { 058 return new Integer(this.columnNames.length); 059 060 } else if ( 061 methodName.equals("getColumnName") 062 || methodName.equals("getColumnLabel")) { 063 064 int col = ((Integer) args[0]).intValue() - 1; 065 return this.columnNames[col]; 066 067 } else if (methodName.equals("hashCode")) { 068 return new Integer(System.identityHashCode(proxy)); 069 070 } else if (methodName.equals("toString")) { 071 return "MockResultSetMetaData " + System.identityHashCode(proxy); 072 073 } else if (methodName.equals("equals")) { 074 return new Boolean(proxy == args[0]); 075 076 } else { 077 throw new UnsupportedOperationException("Unsupported method: " + methodName); 078 } 079 } 080 }