| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.openjpa.jdbc.kernel.exps; |
| |
| import java.sql.SQLException; |
| |
| import org.apache.openjpa.jdbc.meta.JavaSQLTypes; |
| import org.apache.openjpa.jdbc.sql.Result; |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| import org.apache.openjpa.kernel.Filters; |
| import org.apache.openjpa.kernel.exps.ExpressionVisitor; |
| import org.apache.openjpa.meta.ClassMetaData; |
| import org.apache.openjpa.meta.JavaTypes; |
| |
| /** |
| * Value produced by a unary operation on a value. |
| * |
| * @author Abe White |
| */ |
| abstract class UnaryOp |
| extends AbstractVal { |
| |
| |
| private static final long serialVersionUID = 1L; |
| private final Val _val; |
| private ClassMetaData _meta = null; |
| private Class _cast = null; |
| private boolean _noParen = false; |
| |
| /** |
| * Constructor. Provide the value to operate on. |
| */ |
| public UnaryOp(Val val) { |
| _val = val; |
| } |
| |
| public UnaryOp(Val val, boolean noParen) { |
| _val = val; |
| _noParen = noParen; |
| } |
| |
| public Val getValue() { |
| return _val; |
| } |
| |
| @Override |
| public ClassMetaData getMetaData() { |
| return _meta; |
| } |
| |
| @Override |
| public void setMetaData(ClassMetaData meta) { |
| _meta = meta; |
| } |
| |
| @Override |
| public Class getType() { |
| if (_cast != null) |
| return _cast; |
| return getType(_val.getType()); |
| } |
| |
| @Override |
| public void setImplicitType(Class type) { |
| _cast = type; |
| } |
| |
| public boolean getNoParen() { |
| return _noParen; |
| } |
| |
| @Override |
| public ExpState initialize(Select sel, ExpContext ctx, int flags) { |
| return initializeValue(sel, ctx, flags); |
| } |
| |
| protected ExpState initializeValue(Select sel, ExpContext ctx, int flags) { |
| return _val.initialize(sel, ctx, flags); |
| } |
| |
| @Override |
| public void select(Select sel, ExpContext ctx, ExpState state, |
| boolean pks) { |
| sel.select(newSQLBuffer(sel, ctx, state), this); |
| if (isAggregate()) |
| sel.setAggregate(true); |
| } |
| |
| @Override |
| public void selectColumns(Select sel, ExpContext ctx, ExpState state, |
| boolean pks) { |
| _val.selectColumns(sel, ctx, state, true); |
| } |
| |
| @Override |
| public void groupBy(Select sel, ExpContext ctx, ExpState state) { |
| sel.groupBy(newSQLBuffer(sel, ctx, state)); |
| } |
| |
| @Override |
| public void orderBy(Select sel, ExpContext ctx, ExpState state, |
| boolean asc) { |
| sel.orderBy(newSQLBuffer(sel, ctx, state), asc, false, getSelectAs()); |
| } |
| |
| private SQLBuffer newSQLBuffer(Select sel, ExpContext ctx, ExpState state) { |
| calculateValue(sel, ctx, state, null, null); |
| SQLBuffer buf = new SQLBuffer(ctx.store.getDBDictionary()); |
| appendTo(sel, ctx, state, buf, 0); |
| return buf; |
| } |
| |
| @Override |
| public Object load(ExpContext ctx, ExpState state, Result res) |
| throws SQLException { |
| Class<?> type = getType(); |
| int typeCode = type != null ? JavaTypes.getTypeCode(type) : JavaSQLTypes.JDBC_DEFAULT; |
| if (typeCode == JavaTypes.DATE) { |
| // further clarify which date exactly |
| typeCode = JavaSQLTypes.getDateTypeCode(type); |
| } |
| |
| Object value = res.getObject(this, typeCode, null); |
| if (value == null) { |
| if (nullableValue(ctx, state)) { // OPENJPA-1794 |
| return null; |
| } |
| else if (type.isPrimitive() || Number.class.isAssignableFrom(type)) { |
| value = Filters.getDefaultForNull(Filters.wrap(type)); |
| } |
| } |
| return Filters.convert(value, type); |
| } |
| |
| @Override |
| public void calculateValue(Select sel, ExpContext ctx, ExpState state, |
| Val other, ExpState otherState) { |
| _val.calculateValue(sel, ctx, state, null, null); |
| } |
| |
| @Override |
| public int length(Select sel, ExpContext ctx, ExpState state) { |
| return 1; |
| } |
| |
| @Override |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer sql, int index) { |
| sql.append(getOperator()); |
| sql.append(_noParen ? " " : "("); |
| _val.appendTo(sel, ctx, state, sql, 0); |
| |
| // OPENJPA-2149: If _val (Val) is an 'Arg', we need to get the Val[] |
| // from it, and the single element it contains because the |
| // 'addCastForParam' method gets the 'type' from the Val it receives. |
| // In the case where _val is an Arg, when addCastForParam gets the |
| // type, it will be getting the type of the Val (an Object) rather |
| // the type of the Arg. |
| sql.addCastForParam(getOperator(), |
| (_val instanceof Args) ? (((Args) _val).getVals())[0] |
| : _val); |
| if (!_noParen) |
| sql.append(")"); |
| } |
| |
| /** |
| * Return the type of this value based on the argument type. Returns |
| * the argument type by default. |
| */ |
| protected Class getType(Class c) { |
| return c; |
| } |
| |
| /** |
| * Return the name of this operator. |
| */ |
| protected abstract String getOperator(); |
| |
| @Override |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _val.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| |
| // OPENJPA-1794 |
| protected boolean nullableValue(ExpContext ctx, ExpState state) { |
| return false; |
| } |
| |
| } |