| /* |
| * 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.util.Map; |
| |
| 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.lib.util.Localizer; |
| import org.apache.openjpa.util.UserException; |
| |
| /** |
| * Compares two values. |
| * |
| * @author Abe White |
| */ |
| class CompareExpression |
| implements Exp { |
| |
| public static final String LESS = "<"; |
| public static final String GREATER = ">"; |
| public static final String LESS_EQUAL = "<="; |
| public static final String GREATER_EQUAL = ">="; |
| |
| private static final Localizer _loc = Localizer.forPackage |
| (CompareExpression.class); |
| |
| private final Val _val1; |
| private final Val _val2; |
| private final String _op; |
| |
| /** |
| * Constructor. Supply values and operator. |
| */ |
| public CompareExpression(Val val1, Val val2, String op) { |
| _val1 = val1; |
| _val2 = val2; |
| _op = op; |
| } |
| |
| public ExpState initialize(Select sel, ExpContext ctx, Map contains) { |
| ExpState s1 = _val1.initialize(sel, ctx, 0); |
| ExpState s2 = _val2.initialize(sel, ctx, 0); |
| return new BinaryOpExpState(sel.and(s1.joins, s2.joins), s1, s2); |
| } |
| |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer buf) { |
| BinaryOpExpState bstate = (BinaryOpExpState) state; |
| _val1.calculateValue(sel, ctx, bstate.state1, _val2, bstate.state2); |
| _val2.calculateValue(sel, ctx, bstate.state2, _val1, bstate.state1); |
| if (!Filters.canConvert(_val1.getType(), _val2.getType(), false) |
| && !Filters.canConvert(_val2.getType(), _val1.getType(), false)) |
| throw new UserException(_loc.get("cant-convert", _val1.getType(), |
| _val2.getType())); |
| |
| ctx.store.getDBDictionary().comparison(buf, _op, |
| new FilterValueImpl(sel, ctx, bstate.state1, _val1), |
| new FilterValueImpl(sel, ctx, bstate.state2, _val2)); |
| sel.append(buf, state.joins); |
| } |
| |
| public void selectColumns(Select sel, ExpContext ctx, ExpState state, |
| boolean pks) { |
| BinaryOpExpState bstate = (BinaryOpExpState) state; |
| _val1.selectColumns(sel, ctx, bstate.state1, true); |
| _val2.selectColumns(sel, ctx, bstate.state2, true); |
| } |
| |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _val1.acceptVisit(visitor); |
| _val2.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| } |