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/* |
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* Copyright 2010 the original author or authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package org.springframework.datastore.document.mongodb; |
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import java.beans.PropertyDescriptor; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Map; |
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import java.util.Set; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import org.springframework.beans.BeanUtils; |
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import org.springframework.beans.BeanWrapper; |
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import org.springframework.beans.NotReadablePropertyException; |
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import org.springframework.beans.NotWritablePropertyException; |
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import org.springframework.beans.PropertyAccessorFactory; |
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import org.springframework.beans.TypeMismatchException; |
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import org.springframework.dao.DataRetrievalFailureException; |
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import org.springframework.datastore.document.DocumentMapper; |
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import org.springframework.datastore.document.DocumentSource; |
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import org.springframework.util.Assert; |
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import com.mongodb.BasicDBObject; |
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import com.mongodb.DBObject; |
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/** |
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* Class used to map properties of a Document to the corresponding properties of a business object. |
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* |
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* @author Thomas Risberg |
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* @since 1.0 |
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*/ |
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public class MongoBeanPropertyDocumentSource implements DocumentSource<DBObject> { |
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/** Logger available to subclasses */ |
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protected final Log logger = LogFactory.getLog(getClass()); |
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/** The class we are mapping to */ |
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private Object source; |
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/** The class we are mapping to */ |
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private Class<?> mappedClass; |
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/** Map of the fields we provide mapping for */ |
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private Map<String, PropertyDescriptor> mappedFields; |
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/** Set of bean properties we provide mapping for */ |
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private Set<String> mappedProperties; |
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public MongoBeanPropertyDocumentSource(Object source) { |
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initialize(source); |
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} |
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public DBObject getDocument() { |
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BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this.source); |
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DBObject dbo = new BasicDBObject(); |
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for (String key : this.mappedFields.keySet()) { |
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String keyToUse = ("id".equals(key) ? "_id" : key); |
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PropertyDescriptor pd = this.mappedFields.get(key); |
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if (pd != null) { |
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try { |
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Object value = bw.getPropertyValue(key); |
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if (value instanceof Enum) { |
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dbo.put(keyToUse, ((Enum)value).name()); |
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} |
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else { |
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dbo.put(keyToUse, value); |
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} |
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} |
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catch (NotReadablePropertyException ex) { |
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throw new DataRetrievalFailureException( |
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"Unable to map property " + pd.getName() + " to key " + key, ex); |
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} |
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} |
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} |
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return dbo; |
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} |
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/** |
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* Initialize the mapping metadata for the given class. |
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* @param mappedClass the mapped class. |
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*/ |
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protected void initialize(Object source) { |
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this.source = source; |
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this.mappedClass = source.getClass(); |
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this.mappedFields = new HashMap<String, PropertyDescriptor>(); |
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this.mappedProperties = new HashSet<String>(); |
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PropertyDescriptor[] pds = BeanUtils.getPropertyDescriptors(mappedClass); |
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for (PropertyDescriptor pd : pds) { |
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if (pd.getWriteMethod() != null) { |
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this.mappedFields.put(pd.getName(), pd); |
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this.mappedProperties.add(pd.getName()); |
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} |
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} |
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} |
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/** |
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* Initialize the given BeanWrapper to be used for row mapping. |
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* To be called for each row. |
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* <p>The default implementation is empty. Can be overridden in subclasses. |
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* @param bw the BeanWrapper to initialize |
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*/ |
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protected void initBeanWrapper(BeanWrapper bw) { |
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} |
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} |
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