io.ebeaninternal.dbmigration.model.MigrationModel Maven / Gradle / Ivy
package io.ebeaninternal.dbmigration.model;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Build the model from the series of migrations.
*/
public class MigrationModel {
private static final Logger logger = LoggerFactory.getLogger(MigrationModel.class);
private final ModelContainer model = new ModelContainer();
private final File modelDirectory;
private final String modelSuffix;
private MigrationVersion lastVersion;
public MigrationModel(File modelDirectory, String modelSuffix) {
this.modelDirectory = modelDirectory;
this.modelSuffix = modelSuffix;
}
/**
* Read all the migrations returning the model with all
* the migrations applied in version order.
*/
public ModelContainer read() {
readMigrations();
return model;
}
private void readMigrations() {
// find all the migration xml files
File[] xmlFiles = modelDirectory.listFiles(pathname -> pathname.getName().toLowerCase().endsWith(modelSuffix));
List resources = new ArrayList<>(xmlFiles.length);
for (File xmlFile : xmlFiles) {
resources.add(new MigrationResource(xmlFile, createVersion(xmlFile)));
}
// sort into version order before applying
Collections.sort(resources);
for (MigrationResource migrationResource : resources) {
logger.debug("read {}", migrationResource);
model.apply(migrationResource.read(), migrationResource.getVersion());
}
// remember the last version
if (!resources.isEmpty()) {
lastVersion = resources.get(resources.size() - 1).getVersion();
}
}
private MigrationVersion createVersion(File xmlFile) {
String fileName = xmlFile.getName();
String versionName = fileName.substring(0, fileName.length() - modelSuffix.length());
return MigrationVersion.parse(versionName);
}
public String getNextVersion(String initialVersion) {
return lastVersion == null ? initialVersion : lastVersion.nextVersion();
}
}