| /* |
| * 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.lang.reflect.Modifier; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.openjpa.jdbc.meta.ClassMapping; |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| import org.apache.openjpa.meta.ClassMetaData; |
| |
| /** |
| * Compares two entity types. |
| * |
| * @author Catalina Wei |
| */ |
| class EqualTypeExpression |
| extends CompareEqualExpression { |
| |
| |
| private static final long serialVersionUID = 1L; |
| |
| /** |
| * Constructor. Supply values to compare. |
| */ |
| public EqualTypeExpression(Val val1, Val val2) { |
| super(val1, val2); |
| } |
| |
| private ClassMapping getSubClassMapping(Val val1, Val val2, ExpContext ctx) { |
| ClassMapping sub = null; |
| Val val = val1 instanceof Type ? val2 : val1; |
| if (val instanceof TypeLit) |
| sub = (ClassMapping) val.getMetaData(); |
| else if (val instanceof Param) |
| sub = ((Param) val).getValueMetaData(ctx); |
| if (sub != null) |
| ctx.isVerticalStrat = sub.isVerticalStrategy(); |
| return sub; |
| } |
| |
| @Override |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer buf) { |
| Val val1 = getValue1(); |
| Val val2 = getValue2(); |
| ClassMapping sub = getSubClassMapping(val1, val2, ctx); |
| if (ctx.isVerticalStrat) { |
| appendTo(sel, ctx, (BinaryOpExpState)state, buf, false, false); |
| return; |
| } |
| super.appendTo(sel, ctx, state, buf); |
| } |
| |
| @Override |
| public void appendTo(Select sel, ExpContext ctx, BinaryOpExpState bstate, |
| SQLBuffer buf, boolean val1Null, boolean val2Null) { |
| if (val1Null && val2Null) |
| buf.append("1 = 1"); |
| else if (val1Null || val2Null) { |
| Val val = (val1Null) ? getValue2() : getValue1(); |
| ExpState state = (val1Null) ? bstate.state2 : bstate.state1; |
| if (!isDirectComparison()) { |
| int len = val.length(sel, ctx, state); |
| for (int i = 0; i < len; i++) { |
| if (i > 0) |
| buf.append(" AND "); |
| val.appendTo(sel, ctx, state, buf, i); |
| buf.append(" IS ").appendValue(null); |
| } |
| } else |
| val.appendIsNull(sel, ctx, state, buf); |
| } else { |
| Val val1 = getValue1(); |
| Val val2 = getValue2(); |
| if (val1.length(sel, ctx, bstate.state1) == 1 |
| && val2.length(sel, ctx, bstate.state2) == 1) { |
| ClassMapping sub = getSubClassMapping(val1, val2, ctx); |
| if (ctx.isVerticalStrat) { |
| processVerticalTypeAppend(sel, val1, val2, ctx, buf); |
| return; |
| } |
| |
| String op = "="; |
| if (sel.getTablePerClassMeta() != null && sub != sel.getTablePerClassMeta()) |
| op = "<>"; |
| |
| ctx.store.getDBDictionary().comparison(buf, op, |
| new FilterValueImpl(sel, ctx, bstate.state1, val1), |
| new FilterValueImpl(sel, ctx, bstate.state2, val2)); |
| } else { |
| int len = java.lang.Math.min(val1.length(sel, ctx, |
| bstate.state1), val2.length(sel, ctx, bstate.state2)); |
| for (int i = 0; i < len; i++) { |
| if (i > 0) |
| buf.append(" AND "); |
| |
| val1.appendTo(sel, ctx, bstate.state1, buf, i); |
| buf.append(" = "); |
| val2.appendTo(sel, ctx, bstate.state2, buf, i); |
| } |
| } |
| } |
| } |
| |
| void processVerticalTypeAppend(Select sel, Val val1, Val val2, ExpContext ctx, |
| SQLBuffer buf) { |
| ClassMapping sub = getSubClassMapping(val1, val2, ctx); |
| List selectFrom = sel.getJoinedTableClassMeta(); |
| if (selectFrom == null) { |
| selectFrom = new ArrayList(); |
| sel.setJoinedTableClassMeta(selectFrom); |
| } |
| ClassMapping cm1 = (ClassMapping)((val1 instanceof Type) ? val1.getMetaData() : |
| val1.getMetaData()); |
| if (sub.isVerticalStrategy()) { |
| ClassMetaData[] subs = cm1.getPCSubclassMetaDatas(); |
| for (ClassMetaData classMetaData : subs) { |
| if (!Modifier.isAbstract(classMetaData.getDescribedType().getModifiers()) && classMetaData == sub |
| && !selectFrom.contains(classMetaData)) |
| selectFrom.add(classMetaData); |
| } |
| buf.append("1=1"); |
| return; |
| } |
| } |
| |
| } |