/**
* 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.metamodel.schema;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import org.apache.metamodel.DataContext;
import org.apache.metamodel.util.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A composite schema, comprising tables from several {@link DataContext}s.
*/
public class CompositeSchema extends AbstractSchema {
private static final long serialVersionUID = 1L;
private static final Logger logger = LoggerFactory.getLogger(CompositeSchema.class);
private final String name;
private final Collection<? extends Schema> delegates;
public CompositeSchema(String name, Collection<? extends Schema> delegates) {
super();
this.name = name;
this.delegates = delegates;
if (logger.isWarnEnabled()) {
Set<String> names = new HashSet<String>();
for (Table table : getTables()) {
if (names.contains(table.getName())) {
logger.warn("Name-clash detected for Table {}.", table.getName());
logger.warn("getTableByName(\"{}\") will return just the first table.", table.getName());
} else {
names.add(table.getName());
}
}
if (!names.isEmpty()) {
logger.warn("The following table names clashes in composite schema: " + names);
}
}
}
@Override
public Relationship[] getRelationships() {
Relationship[] result = new Relationship[0];
for (Schema delegate : delegates) {
result = CollectionUtils.array(result, delegate.getRelationships());
}
return result;
}
@Override
public Table[] getTables() {
Table[] result = new Table[0];
for (Schema delegate : delegates) {
result = CollectionUtils.array(result, delegate.getTables());
}
return result;
}
@Override
public String getName() {
return name;
}
@Override
public String getQuote() {
return null;
}
}