| /* |
| * 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.List; |
| |
| import org.apache.openjpa.jdbc.meta.ClassMapping; |
| import org.apache.openjpa.jdbc.meta.FieldMapping; |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| |
| /** |
| * Compares two values. |
| * |
| * @author Abe White |
| */ |
| class EqualExpression |
| extends CompareEqualExpression { |
| |
| /** |
| * Constructor. Supply values to compare. |
| */ |
| public EqualExpression(Val val1, Val val2) { |
| super(val1, val2); |
| } |
| |
| 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) { |
| ctx.store.getDBDictionary().comparison(buf, "=", |
| new FilterValueImpl(sel, ctx, bstate.state1, val1), |
| new FilterValueImpl(sel, ctx, bstate.state2, val2)); |
| } else { |
| int lenVal1 = val1.length(sel, ctx, bstate.state1); |
| int lenVal2 = val2.length(sel, ctx, bstate.state2); |
| int len = java.lang.Math.min(lenVal1, lenVal2); |
| |
| // OPENJPA-2631: Detect and handle slightly differently the |
| // case where a composite PK is in use. When an equals comparison |
| // is created by CriteriaBuilder, and the comparison is done against |
| // an entity with a composite PK, 'val2' can be either a: |
| // 1) Lit - in this case a Lit is hard coded to return a length of 1. |
| // 2) Param - in this case the metadata is null so length will return 1. |
| // Given this, first look to see if lenVal1 is greater than lenVal2. |
| if (lenVal1 > lenVal2) { |
| // If here, lets get the metadata from val1 and see if its PK |
| // is an embeddable. If so, the length (val1Len) will be the |
| // size of the number of colunns in the PK. Use this length |
| // in order to create an equal expression with the right number |
| // of 'AND' statementes. |
| ClassMapping cm = (ClassMapping) val1.getMetaData(); |
| FieldMapping[] fmsPK = cm.getPrimaryKeyFieldMappings(); |
| |
| if (fmsPK[0].isEmbedded()) { |
| len = lenVal1; |
| } |
| } |
| |
| 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); |
| } |
| } |
| } |
| } |
| } |