| 1 | /* |
| 2 | * Copyright 2007 brunella ltd |
| 3 | * |
| 4 | * Licensed under the LGPL Version 3 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * |
| 7 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 8 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 9 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 10 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 11 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 12 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 13 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 14 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 15 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 16 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| 17 | * THE POSSIBILITY OF SUCH DAMAGE. |
| 18 | */ |
| 19 | package sf.qof.adapter; |
| 20 | |
| 21 | import static sf.qof.codegen.Constants.SIG_length; |
| 22 | import static sf.qof.codegen.Constants.SIG_registerOutParameter; |
| 23 | import static sf.qof.codegen.Constants.SIG_setNull; |
| 24 | import static sf.qof.codegen.Constants.TYPE_CallableStatement; |
| 25 | import static sf.qof.codegen.Constants.TYPE_PreparedStatement; |
| 26 | import static sf.qof.codegen.Constants.TYPE_ResultSet; |
| 27 | import static sf.qof.codegen.Constants.TYPE_String; |
| 28 | import static sf.qof.codegen.Constants.TYPE_int; |
| 29 | |
| 30 | import java.io.StringReader; |
| 31 | import java.util.HashSet; |
| 32 | import java.util.Set; |
| 33 | |
| 34 | import net.sf.cglib.core.CodeEmitter; |
| 35 | import net.sf.cglib.core.Local; |
| 36 | import net.sf.cglib.core.Signature; |
| 37 | |
| 38 | import org.objectweb.asm.Label; |
| 39 | import org.objectweb.asm.Type; |
| 40 | |
| 41 | import sf.qof.QueryObjectFactory; |
| 42 | import sf.qof.mapping.ParameterMapping; |
| 43 | import sf.qof.mapping.ResultMapping; |
| 44 | |
| 45 | /** |
| 46 | * ClobAdapter is a generator mapping adapter for SQL Clob data types. |
| 47 | * |
| 48 | * <p>It maps <code>Clob</code> columns to <code>String</code> and vice versa.</p> |
| 49 | * |
| 50 | * @see java.sql.Clob |
| 51 | */ |
| 52 | public class ClobAdapter implements GeneratorMappingAdapter { |
| 53 | |
| 54 | private static final Type TYPE_StringReader = Type.getType(StringReader.class); |
| 55 | private static final Type TYPE_Blob = Type.getType(java.sql.Blob.class); |
| 56 | private static final Type TYPE_ClobReader = Type.getType(ClobReader.class); |
| 57 | private static final Signature SIG_setCharacterStream = new Signature("setCharacterStream", "(ILjava/io/Reader;I)V"); |
| 58 | private static final Signature SIG_ConstructorStringReader = new Signature("<init>", "(Ljava/lang/String;)V"); |
| 59 | private static final Signature SIG_getClob = new Signature("getClob", "(I)Ljava/sql/Clob;"); |
| 60 | private static final Signature SIG_getClobNamed = new Signature("getClob", "(Ljava/lang/String;)Ljava/sql/Clob;"); |
| 61 | private static final Signature SIG_readClob = new Signature("readClob", "(Ljava/sql/Clob;)Ljava/lang/String;"); |
| 62 | |
| 63 | public void generateFromResult(ResultMapping resultMapping, CodeEmitter co, Local result, int[] indexes) { |
| 64 | co.load_local(result); |
| 65 | co.push(indexes[0]); |
| 66 | co.invoke_interface(result.getType(), SIG_getClob); |
| 67 | emitProcessResult(resultMapping, co); |
| 68 | } |
| 69 | |
| 70 | public void generateFromResultSet(ResultMapping resultMapping, CodeEmitter co, Local resultSet, String[] columns) { |
| 71 | co.load_local(resultSet); |
| 72 | co.push(columns[0]); |
| 73 | co.invoke_interface(TYPE_ResultSet, SIG_getClobNamed); |
| 74 | emitProcessResult(resultMapping, co); |
| 75 | } |
| 76 | |
| 77 | private void emitProcessResult(ResultMapping resultMapping, CodeEmitter co) { |
| 78 | Local localBlob = co.make_local(TYPE_Blob); |
| 79 | co.store_local(localBlob); |
| 80 | Label labelNull = co.make_label(); |
| 81 | co.load_local(localBlob); |
| 82 | co.ifnull(labelNull); |
| 83 | // not null |
| 84 | co.load_local(localBlob); |
| 85 | co.invoke_static(TYPE_ClobReader, SIG_readClob); |
| 86 | |
| 87 | Label labelEnd = co.make_label(); |
| 88 | co.goTo(labelEnd); |
| 89 | |
| 90 | // null |
| 91 | co.mark(labelNull); |
| 92 | co.aconst_null(); |
| 93 | co.mark(labelEnd); |
| 94 | } |
| 95 | |
| 96 | public void generateToPreparedStatement(ParameterMapping parameterMapping, CodeEmitter co, Local preparedStatement, int[] indexes, Local indexOffset) { |
| 97 | Local localString = co.make_local(TYPE_String); |
| 98 | Label labelNull = co.make_label(); |
| 99 | Label labelEnd = co.make_label(); |
| 100 | co.store_local(localString); |
| 101 | co.load_local(localString); |
| 102 | co.ifnull(labelNull); |
| 103 | // not null |
| 104 | co.load_local(preparedStatement); |
| 105 | co.push(indexes[0]); |
| 106 | if (indexOffset != null) { |
| 107 | co.load_local(indexOffset); |
| 108 | co.math(CodeEmitter.ADD, TYPE_int); |
| 109 | } |
| 110 | co.new_instance(TYPE_StringReader); |
| 111 | co.dup(); |
| 112 | co.load_local(localString); |
| 113 | co.invoke_constructor(TYPE_StringReader, SIG_ConstructorStringReader); |
| 114 | co.load_local(localString); |
| 115 | co.invoke_virtual(TYPE_String, SIG_length); |
| 116 | co.invoke_interface(TYPE_PreparedStatement, SIG_setCharacterStream); |
| 117 | co.goTo(labelEnd); |
| 118 | |
| 119 | co.mark(labelNull); |
| 120 | // null |
| 121 | co.load_local(preparedStatement); |
| 122 | co.push(indexes[0]); |
| 123 | if (indexOffset != null) { |
| 124 | co.load_local(indexOffset); |
| 125 | co.math(CodeEmitter.ADD, TYPE_int); |
| 126 | } |
| 127 | co.push(java.sql.Types.CLOB); |
| 128 | co.invoke_interface(TYPE_PreparedStatement, SIG_setNull); |
| 129 | |
| 130 | co.mark(labelEnd); |
| 131 | } |
| 132 | |
| 133 | public void generateRegisterOutputParameters(ResultMapping resultMapping, CodeEmitter co, Local callableStatement, |
| 134 | int[] indexes) { |
| 135 | co.load_local(callableStatement); |
| 136 | co.push(indexes[0]); |
| 137 | co.push(java.sql.Types.CLOB); |
| 138 | co.invoke_interface(TYPE_CallableStatement, SIG_registerOutParameter); |
| 139 | } |
| 140 | |
| 141 | public int getNumberOfColumns() { |
| 142 | return 1; |
| 143 | } |
| 144 | |
| 145 | public Set<Class<?>> getTypes() { |
| 146 | return typeSet; |
| 147 | } |
| 148 | |
| 149 | private static Set<Class<?>> typeSet; |
| 150 | |
| 151 | static { |
| 152 | typeSet = new HashSet<Class<?>>(); |
| 153 | typeSet.add(String.class); |
| 154 | } |
| 155 | |
| 156 | private final static ClobAdapter generator = new ClobAdapter(); |
| 157 | |
| 158 | /** |
| 159 | * Register the mapping adapter with the default name "clob". |
| 160 | */ |
| 161 | public static void register() { |
| 162 | register("clob"); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Register the mapping adapter with the specified name. |
| 167 | * |
| 168 | * @param typeName type name |
| 169 | */ |
| 170 | public static void register(String typeName) { |
| 171 | QueryObjectFactory.registerMapper(typeName, generator); |
| 172 | } |
| 173 | |
| 174 | } |