Source Code Cross Referenced for MapDataSourceLookup.java in  » J2EE » spring-framework-2.5 » org » springframework » jdbc » datasource » lookup » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.jdbc.datasource.lookup 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.jdbc.datasource.lookup;
018:
019:        import java.util.Collections;
020:        import java.util.HashMap;
021:        import java.util.Map;
022:
023:        import javax.sql.DataSource;
024:
025:        import org.springframework.util.Assert;
026:
027:        /**
028:         * Simple {@link DataSourceLookup} implementation that relies on a map for doing lookups.
029:         *
030:         * <p>Useful for testing environments or applications that need to match arbitrary
031:         * {@link String} names to target {@link DataSource} objects.
032:         *
033:         * @author Costin Leau
034:         * @author Juergen Hoeller
035:         * @author Rick Evans
036:         * @since 2.0
037:         */
038:        public class MapDataSourceLookup implements  DataSourceLookup {
039:
040:            private final Map dataSources = new HashMap(4);
041:
042:            /**
043:             * Create a new instance of the {@link MapDataSourceLookup} class.
044:             */
045:            public MapDataSourceLookup() {
046:            }
047:
048:            /**
049:             * Create a new instance of the {@link MapDataSourceLookup} class.
050:             * @param dataSources the {@link Map} of {@link DataSource DataSources}; the keys
051:             * are {@link String Strings}, the values are actual {@link DataSource} instances.
052:             */
053:            public MapDataSourceLookup(Map dataSources) {
054:                setDataSources(dataSources);
055:            }
056:
057:            /**
058:             * Create a new instance of the {@link MapDataSourceLookup} class.
059:             * @param dataSourceName the name under which the supplied {@link DataSource} is to be added
060:             * @param dataSource the {@link DataSource} to be added
061:             */
062:            public MapDataSourceLookup(String dataSourceName,
063:                    DataSource dataSource) {
064:                addDataSource(dataSourceName, dataSource);
065:            }
066:
067:            /**
068:             * Set the {@link Map} of {@link DataSource DataSources}; the keys
069:             * are {@link String Strings}, the values are actual {@link DataSource} instances.
070:             * <p>If the supplied {@link Map} is <code>null</code>, then this method
071:             * call effectively has no effect. 
072:             * @param dataSources said {@link Map} of {@link DataSource DataSources}
073:             */
074:            public void setDataSources(Map dataSources) {
075:                if (dataSources != null) {
076:                    this .dataSources.putAll(dataSources);
077:                }
078:            }
079:
080:            /**
081:             * Get the {@link Map} of {@link DataSource DataSources} maintained by this object.
082:             * <p>The returned {@link Map} is {@link Collections#unmodifiableMap(java.util.Map) unmodifiable}.
083:             * @return said {@link Map} of {@link DataSource DataSources} (never <code>null</code>) 
084:             */
085:            public Map getDataSources() {
086:                return Collections.unmodifiableMap(this .dataSources);
087:            }
088:
089:            /**
090:             * Add the supplied {@link DataSource} to the map of {@link DataSource DataSources}
091:             * maintained by this object.
092:             * @param dataSourceName the name under which the supplied {@link DataSource} is to be added
093:             * @param dataSource the {@link DataSource} to be so added
094:             */
095:            public void addDataSource(String dataSourceName,
096:                    DataSource dataSource) {
097:                Assert.notNull(dataSourceName,
098:                        "DataSource name must not be null");
099:                Assert.notNull(dataSource, "DataSource must not be null");
100:                this .dataSources.put(dataSourceName, dataSource);
101:            }
102:
103:            public DataSource getDataSource(String dataSourceName)
104:                    throws DataSourceLookupFailureException {
105:                Assert.notNull(dataSourceName,
106:                        "DataSource name must not be null");
107:                Object value = this .dataSources.get(dataSourceName);
108:                if (value == null) {
109:                    throw new DataSourceLookupFailureException(
110:                            "No DataSource with name '" + dataSourceName
111:                                    + "' registered");
112:                }
113:                if (!(value instanceof  DataSource)) {
114:                    throw new DataSourceLookupFailureException(
115:                            "The object ["
116:                                    + value
117:                                    + "] with name '"
118:                                    + dataSourceName
119:                                    + "' in the DataSource map is not a [javax.sql.DataSource]");
120:                }
121:                return (DataSource) value;
122:            }
123:
124:        }
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