| /***************************************************************** |
| * 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 |
| * |
| * https://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.cayenne.dbsync.merge; |
| |
| import java.sql.Types; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.cayenne.dbsync.merge.token.ValueForNullProvider; |
| import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory; |
| import org.apache.cayenne.dbsync.merge.token.MergerToken; |
| import org.apache.cayenne.map.DbAttribute; |
| import org.apache.cayenne.map.DbEntity; |
| import org.apache.cayenne.dbsync.model.DetectedDbEntity; |
| |
| class DbAttributeMerger extends AbstractMerger<DbEntity, DbAttribute> { |
| |
| static int[] typesWithMaxLength = { |
| Types.NCHAR, Types.NVARCHAR, |
| Types.CHAR, Types.VARCHAR, |
| Types.BINARY, Types.VARBINARY, |
| Types.TIME, Types.TIMESTAMP |
| }; |
| |
| private final ValueForNullProvider valueForNull; |
| |
| DbAttributeMerger(MergerTokenFactory tokenFactory, ValueForNullProvider valueForNull) { |
| super(tokenFactory); |
| this.valueForNull = valueForNull; |
| } |
| |
| @Override |
| MergerDictionaryDiff<DbAttribute> createDiff(DbEntity original, DbEntity imported) { |
| return new MergerDictionaryDiff.Builder<DbAttribute>() |
| .originalDictionary(new DbAttributeDictionary(original)) |
| .importedDictionary(new DbAttributeDictionary(imported)) |
| .build(); |
| } |
| |
| /** |
| * Add column to db |
| * @param original attribute found in model but missing in db |
| */ |
| @Override |
| Collection<MergerToken> createTokensForMissingImported(DbAttribute original) { |
| DbEntity originalDbEntity = original.getEntity(); |
| List<MergerToken> tokens = new LinkedList<>(); |
| tokens.add(getTokenFactory().createAddColumnToDb(originalDbEntity, original)); |
| |
| // Create not null check |
| if (original.isMandatory()) { |
| if (valueForNull.hasValueFor(originalDbEntity, original)) { |
| tokens.add(getTokenFactory().createSetValueForNullToDb(originalDbEntity, original, valueForNull)); |
| } |
| tokens.add(getTokenFactory().createSetNotNullToDb(originalDbEntity, original)); |
| } |
| |
| if(original.isPrimaryKey() |
| && originalDbEntity instanceof DetectedDbEntity |
| && "VIEW".equals(((DetectedDbEntity) originalDbEntity).getType())) { |
| // Views doesn't has PKs in a database, but if the user selects some PKs in a model, we put these keys. |
| return null; |
| } |
| return tokens; |
| } |
| |
| /** |
| * Drop column in db |
| * @param imported attribute found in db but missing in model |
| */ |
| @Override |
| Collection<MergerToken> createTokensForMissingOriginal(DbAttribute imported) { |
| DbEntity originalDbEntity = getOriginalDictionary().getByName(imported.getEntity().getName().toUpperCase()); |
| return Collections.singleton(getTokenFactory().createDropColumnToDb(originalDbEntity, imported)); |
| } |
| |
| /** |
| * Compare same attributes in model and db |
| */ |
| @Override |
| Collection<MergerToken> createTokensForSame(MergerDiffPair<DbAttribute> same) { |
| List<MergerToken> tokens = new LinkedList<>(); |
| |
| // isMandatory flag |
| checkMandatory(same.getOriginal(), same.getImported(), tokens); |
| // check type (including max length, scale and precision) |
| checkType(same.getOriginal(), same.getImported(), tokens); |
| // not implemented yet |
| // isGenerated flag |
| checkIsGenerated(same.getOriginal(), same.getImported(), tokens); |
| |
| return tokens; |
| } |
| |
| private void checkMandatory(DbAttribute original, DbAttribute imported, List<MergerToken> tokens) { |
| if(original.isMandatory() == imported.isMandatory()) { |
| return; |
| } |
| |
| DbEntity originalDbEntity = original.getEntity(); |
| if (original.isMandatory()) { |
| if (valueForNull.hasValueFor(originalDbEntity, original)) { |
| tokens.add(getTokenFactory().createSetValueForNullToDb(originalDbEntity, original, valueForNull)); |
| } |
| tokens.add(getTokenFactory().createSetNotNullToDb(originalDbEntity, original)); |
| } else { |
| tokens.add(getTokenFactory().createSetAllowNullToDb(originalDbEntity, original)); |
| } |
| } |
| |
| /** |
| * Check whether attributes have same type, max length, scale and precision |
| * @param original attribute in model |
| * @param imported attribute from db |
| * @return true if attributes not same |
| */ |
| private boolean needUpdateType(DbAttribute original, DbAttribute imported) { |
| if(original.getType() != imported.getType()) { |
| // Decimal and NUMERIC types are effectively equal so skip their interchange |
| if( (original.getType() == Types.DECIMAL || original.getType() == Types.NUMERIC) && |
| (imported.getType() == Types.DECIMAL || imported.getType() == Types.NUMERIC)) { |
| return false; |
| } |
| return getTokenFactory().needUpdateSpecificType(original, imported); |
| } |
| |
| if(original.getMaxLength() != imported.getMaxLength()) { |
| for(int type : typesWithMaxLength) { |
| if(original.getType() == type) { |
| return true; |
| } |
| } |
| } |
| |
| if(needUpdateScale(original, imported)) { |
| return true; |
| } |
| |
| if(original.getAttributePrecision() != imported.getAttributePrecision()) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| private boolean needUpdateScale(DbAttribute original, DbAttribute imported) { |
| if(original.getScale() == imported.getScale()) { |
| return false; |
| } |
| |
| // -1 and 0 are actually equal values for scale |
| if((original.getScale() == -1 || original.getScale() == 0) |
| && (imported.getScale() == -1 || imported.getScale() == 0)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| private void checkType(DbAttribute original, DbAttribute imported, List<MergerToken> tokens) { |
| if(!needUpdateType(original, imported)) { |
| return; |
| } |
| DbEntity originalDbEntity = original.getEntity(); |
| tokens.add(getTokenFactory().createSetColumnTypeToDb(originalDbEntity, imported, original)); |
| } |
| |
| private void checkIsGenerated(DbAttribute original, DbAttribute imported, List<MergerToken> tokens) { |
| if(original.isGenerated() == imported.isGenerated()) { |
| return; |
| } |
| |
| tokens.add(getTokenFactory().createSetGeneratedFlagToDb(original.getEntity(), original, original.isGenerated())); |
| } |
| |
| @Override |
| public List<MergerToken> createMergeTokens() { |
| throw new UnsupportedOperationException(); |
| } |
| } |