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/*
* Copyright 2002-2012 the original author or authors.
*
* 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 org.springframework.jdbc.datasource.lookup;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.util.Assert;
/**
* Simple {@link DataSourceLookup} implementation that relies on a map for doing lookups.
*
* <p>Useful for testing environments or applications that need to match arbitrary
* {@link String} names to target {@link DataSource} objects.
*
* @author Costin Leau
* @author Juergen Hoeller
* @author Rick Evans
* @since 2.0
*/
public class MapDataSourceLookup implements DataSourceLookup {
private final Map<String, DataSource> dataSources = new HashMap<String, DataSource>(4);
/**
* Create a new instance of the {@link MapDataSourceLookup} class.
*/
public MapDataSourceLookup() {
}
/**
* Create a new instance of the {@link MapDataSourceLookup} class.
* @param dataSources the {@link Map} of {@link DataSource DataSources}; the keys
* are {@link String Strings}, the values are actual {@link DataSource} instances.
*/
public MapDataSourceLookup(Map<String, DataSource> dataSources) {
setDataSources(dataSources);
}
/**
* Create a new instance of the {@link MapDataSourceLookup} class.
* @param dataSourceName the name under which the supplied {@link DataSource} is to be added
* @param dataSource the {@link DataSource} to be added
*/
public MapDataSourceLookup(String dataSourceName, DataSource dataSource) {
addDataSource(dataSourceName, dataSource);
}
/**
* Set the {@link Map} of {@link DataSource DataSources}; the keys
* are {@link String Strings}, the values are actual {@link DataSource} instances.
* <p>If the supplied {@link Map} is {@code null}, then this method
* call effectively has no effect.
* @param dataSources said {@link Map} of {@link DataSource DataSources}
*/
public void setDataSources(Map<String, DataSource> dataSources) {
if (dataSources != null) {
this.dataSources.putAll(dataSources);
}
}
/**
* Get the {@link Map} of {@link DataSource DataSources} maintained by this object.
* <p>The returned {@link Map} is {@link Collections#unmodifiableMap(java.util.Map) unmodifiable}.
* @return said {@link Map} of {@link DataSource DataSources} (never {@code null})
*/
public Map<String, DataSource> getDataSources() {
return Collections.unmodifiableMap(this.dataSources);
}
/**
* Add the supplied {@link DataSource} to the map of {@link DataSource DataSources}
* maintained by this object.
* @param dataSourceName the name under which the supplied {@link DataSource} is to be added
* @param dataSource the {@link DataSource} to be so added
*/
public void addDataSource(String dataSourceName, DataSource dataSource) {
Assert.notNull(dataSourceName, "DataSource name must not be null");
Assert.notNull(dataSource, "DataSource must not be null");
this.dataSources.put(dataSourceName, dataSource);
}
@Override
public DataSource getDataSource(String dataSourceName) throws DataSourceLookupFailureException {
Assert.notNull(dataSourceName, "DataSource name must not be null");
DataSource dataSource = this.dataSources.get(dataSourceName);
if (dataSource == null) {
throw new DataSourceLookupFailureException(
"No DataSource with name '" + dataSourceName + "' registered");
}
return dataSource;
}
}
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