| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * ExpressionFunctionInsert.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | * Created on 17.06.2006 |
| 33 | */ |
| 34 | package smallsql.database; |
| 35 | |
| 36 | import java.io.ByteArrayOutputStream; |
| 37 | |
| 38 | |
| 39 | /** |
| 40 | * @author Volker Berlin |
| 41 | */ |
| 42 | public class ExpressionFunctionInsert extends ExpressionFunctionReturnP1StringAndBinary { |
| 43 | |
| 44 | final int getFunction() { |
| 45 | return SQLTokenizer.INSERT; |
| 46 | } |
| 47 | |
| 48 | |
| 49 | final boolean isNull() throws Exception { |
| 50 | return param1.isNull() || param2.isNull() || param3.isNull() || param4.isNull(); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | final byte[] getBytes() throws Exception{ |
| 55 | if(isNull()) return null; |
| 56 | byte[] bytes = param1.getBytes(); |
| 57 | int start = Math.min(Math.max( 0, param2.getInt() - 1), bytes.length ); |
| 58 | int length = Math.min(param3.getInt(), bytes.length ); |
| 59 | ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
| 60 | buffer.write(bytes,0,start); |
| 61 | buffer.write(param4.getBytes()); |
| 62 | if(length < 0) |
| 63 | throw Utils.createSQLException("Invalid length '"+length + "' in function INSERT"); |
| 64 | buffer.write(bytes, start+length, bytes.length-start-length); |
| 65 | return buffer.toByteArray(); |
| 66 | } |
| 67 | |
| 68 | |
| 69 | final String getString() throws Exception { |
| 70 | if(isNull()) return null; |
| 71 | String str = param1.getString(); |
| 72 | int start = Math.min(Math.max( 0, param2.getInt() - 1), str.length() ); |
| 73 | int length = Math.min(param3.getInt(), str.length() ); |
| 74 | StringBuffer buffer = new StringBuffer(); |
| 75 | buffer.append(str.substring(0,start)); |
| 76 | buffer.append(param4.getString()); |
| 77 | if(length < 0) |
| 78 | throw Utils.createSQLException("Invalid length '"+length + "' in function INSERT"); |
| 79 | buffer.append(str.substring(start+length)); |
| 80 | return buffer.toString(); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | int getPrecision() { |
| 85 | return param1.getPrecision()+param2.getPrecision(); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | |
| 90 | } |