com.querydsl.sql.namemapping.ChainedNameMapping Maven / Gradle / Ivy
/*
* Copyright 2018, The Querydsl Team (http://www.querydsl.com/team)
*
* Licensed 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 com.querydsl.sql.namemapping;
import com.google.common.base.Optional;
import com.querydsl.sql.SchemaAndTable;
/**
* A {@link NameMapping} implementation that accepts zero or more
* {@link NameMapping}s and returns the first non-null mapping result.
*/
public class ChainedNameMapping implements NameMapping {
private NameMapping[] nameMappings;
public ChainedNameMapping(NameMapping... nameMappings) {
if (nameMappings == null) {
throw new NullPointerException("Name mapping array must not be null");
}
for (NameMapping nameMapping : nameMappings) {
if (nameMapping == null) {
throw new NullPointerException("Name mapping array must not contain null element");
}
}
this.nameMappings = nameMappings.clone();
}
@Override
public Optional getColumnOverride(SchemaAndTable key, String column) {
for (NameMapping nameMapping : nameMappings) {
Optional overriddenColumnName = nameMapping.getColumnOverride(key, column);
if (overriddenColumnName.isPresent()) {
return overriddenColumnName;
}
}
return Optional.absent();
}
@Override
public Optional getOverride(SchemaAndTable key) {
for (NameMapping nameMapping : nameMappings) {
Optional overridden = nameMapping.getOverride(key);
if (overridden.isPresent()) {
return overridden;
}
}
return Optional.absent();
}
}