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Cayenne Object Persistence Framework
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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.query;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.cayenne.ObjectId;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;
/**
* Batched INSERT query. Allows inserting multiple object snapshots (DataRows) for a given
* DbEntity in a single query. InsertBatchQuery normally is not used directly. Rather
* DataContext creates one internally when committing DataObjects.
*
* @author Andriy Shapochka
*/
public class InsertBatchQuery extends BatchQuery {
/**
* @since 1.2
*/
protected List objectIds;
protected List objectSnapshots;
protected List dbAttributes;
/**
* Creates new InsertBatchQuery for a given DbEntity and estimated capacity.
*/
public InsertBatchQuery(DbEntity entity, int batchCapacity) {
super(entity);
this.objectSnapshots = new ArrayList(batchCapacity);
this.objectIds = new ArrayList(batchCapacity);
this.dbAttributes = new ArrayList(getDbEntity().getAttributes());
}
public Object getValue(int dbAttributeIndex) {
DbAttribute attribute = (DbAttribute) dbAttributes.get(dbAttributeIndex);
Map currentSnapshot = (Map) objectSnapshots.get(batchIndex);
return getValue(currentSnapshot, attribute);
}
/**
* Adds a snapshot to batch. A shortcut for "add(snapshot, null)".
*/
public void add(Map snapshot) {
add(snapshot, null);
}
/**
* Adds a snapshot to batch. Optionally stores the object id for the snapshot. Note
* that snapshot can hold either the real values or the instances of
* org.apache.commons.collections.Factory that will be resolved to the actual value on
* the spot, thus allowing deferred propagated keys resolution.
*
* @since 1.2
*/
public void add(Map snapshot, ObjectId id) {
objectSnapshots.add(snapshot);
objectIds.add(id);
}
public int size() {
return objectSnapshots.size();
}
public List getDbAttributes() {
return dbAttributes;
}
/**
* Returns an ObjectId associated with the current batch iteration. Used internally by
* Cayenne to match current iteration with a specific object and assign it generated
* keys.
*
* @since 1.2
*/
public ObjectId getObjectId() {
return (ObjectId) objectIds.get(batchIndex);
}
}
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