// This software is released into the Public Domain. See copying.txt for details.
package org.openstreetmap.osmosis.apidb.v0_6;
import java.util.HashMap;
import java.util.Map;
import org.openstreetmap.osmosis.core.OsmosisRuntimeException;
import org.openstreetmap.osmosis.apidb.v0_6.impl.ActionChangeWriter;
import org.openstreetmap.osmosis.apidb.v0_6.impl.ChangeWriter;
import org.openstreetmap.osmosis.apidb.v0_6.impl.SchemaVersionValidator;
import org.openstreetmap.osmosis.core.container.v0_6.ChangeContainer;
import org.openstreetmap.osmosis.core.database.DatabaseLoginCredentials;
import org.openstreetmap.osmosis.core.database.DatabasePreferences;
import org.openstreetmap.osmosis.core.task.common.ChangeAction;
import org.openstreetmap.osmosis.core.task.v0_6.ChangeSink;
/**
* A change sink writing to database tables. This aims to be suitable for running at regular
* intervals with database overhead proportional to changeset size.
*
* @author Brett Henderson
*/
public class ApidbChangeWriter implements ChangeSink {
private final ChangeWriter changeWriter;
private final Map<ChangeAction, ActionChangeWriter> actionWriterMap;
private final SchemaVersionValidator schemaVersionValidator;
/**
* Creates a new instance.
*
* @param loginCredentials Contains all information required to connect to the database.
* @param preferences Contains preferences configuring database behaviour.
* @param populateCurrentTables If true, the current tables will be populated as well as history
* tables.
*/
public ApidbChangeWriter(DatabaseLoginCredentials loginCredentials, DatabasePreferences preferences,
boolean populateCurrentTables) {
changeWriter = new ChangeWriter(loginCredentials, populateCurrentTables);
actionWriterMap = new HashMap<ChangeAction, ActionChangeWriter>();
actionWriterMap.put(ChangeAction.Create, new ActionChangeWriter(changeWriter, ChangeAction.Create));
actionWriterMap.put(ChangeAction.Modify, new ActionChangeWriter(changeWriter, ChangeAction.Modify));
actionWriterMap.put(ChangeAction.Delete, new ActionChangeWriter(changeWriter, ChangeAction.Delete));
schemaVersionValidator = new SchemaVersionValidator(loginCredentials, preferences);
}
/**
* {@inheritDoc}
*/
public void initialize(Map<String, Object> metaData) {
// Do nothing.
}
/**
* {@inheritDoc}
*/
public void process(ChangeContainer change) {
ChangeAction action;
// Verify that the schema version is supported.
schemaVersionValidator.validateVersion(ApidbVersionConstants.SCHEMA_MIGRATIONS);
action = change.getAction();
if (!actionWriterMap.containsKey(action)) {
throw new OsmosisRuntimeException("The action " + action + " is unrecognized.");
}
// Process the entity using the action writer appropriate for the change
// action.
change.getEntityContainer().process(actionWriterMap.get(action));
}
/**
* {@inheritDoc}
*/
public void complete() {
changeWriter.complete();
}
/**
* {@inheritDoc}
*/
public void release() {
changeWriter.release();
}
}