com.flipkart.hbaseobjectmapper.WrappedHBTable Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hbase-object-mapper Show documentation
Show all versions of hbase-object-mapper Show documentation
HBase ORM is a light-weight, thread-safe and performant library that enables:
[1] object-oriented access of HBase rows (Data Access Object) with minimal code and good testability
[2] reading from and/or writing to HBase tables in Hadoop MapReduce jobs
package com.flipkart.hbaseobjectmapper;
import com.flipkart.hbaseobjectmapper.exceptions.DuplicateCodecFlagForRowKeyException;
import com.flipkart.hbaseobjectmapper.exceptions.ImproperHBTableAnnotationExceptions;
import org.apache.hadoop.hbase.TableName;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/**
* A wrapper for {@link HBTable} annotation (for internal use only)
*
* @param Data type of row key
* @param Entity type
*/
class WrappedHBTable, T extends HBRecord> {
private final TableName tableName;
private final Map families; // This should evolve to Map
private final Map codecFlags;
private final Class clazz;
WrappedHBTable(Class clazz) {
this.clazz = clazz;
final HBTable hbTable = clazz.getAnnotation(HBTable.class);
if (hbTable == null) {
throw new ImproperHBTableAnnotationExceptions.MissingHBTableAnnotationException(String.format("Class %s is missing %s annotation", clazz.getName(), HBTable.class.getSimpleName()));
}
if (hbTable.name().isEmpty()) {
throw new ImproperHBTableAnnotationExceptions.EmptyTableNameOnHBTableAnnotationException(String.format("Annotation %s on class %s has empty name", HBTable.class.getName(), clazz.getName()));
}
tableName = TableName.valueOf(hbTable.name().getBytes());
codecFlags = toMap(hbTable.rowKeyCodecFlags());
families = new HashMap<>(hbTable.families().length, 1.0f);
for (Family family : hbTable.families()) {
if (family.name().isEmpty()) {
throw new ImproperHBTableAnnotationExceptions.EmptyColumnFamilyOnHBTableAnnotationException(String.format("The %s annotation on class %s has a column family with empty name", HBTable.class.getSimpleName(), clazz.getName()));
}
if (family.versions() < 1) {
throw new ImproperHBTableAnnotationExceptions.InvalidValueForVersionsOnHBTableAnnotationException(String.format("The %s annotation on class %s has a column family '%s' which has 'versions' less than 1", HBTable.class.getSimpleName(), clazz.getName(), family.name()));
}
final Integer prevValue = families.put(family.name(), family.versions());
if (prevValue != null) {
throw new ImproperHBTableAnnotationExceptions.DuplicateColumnFamilyNamesOnHBTableAnnotationException(String.format("The %s annotation on class %s has two or more column families with same name '%s' (Note: column family names must be unique)", HBTable.class.getSimpleName(), clazz.getName(), family.name()));
}
}
}
private Map toMap(Flag[] codecFlags) {
Map flagsMap = new HashMap<>(codecFlags.length, 1.0f);
for (Flag flag : codecFlags) {
String previousValue = flagsMap.put(flag.name(), flag.value());
if (previousValue != null) {
throw new DuplicateCodecFlagForRowKeyException(clazz, flag.name());
}
}
return flagsMap;
}
Map getFamiliesAndVersions() {
return families;
}
boolean isColumnFamilyPresent(String familyName) {
return families.containsKey(familyName);
}
TableName getName() {
return tableName;
}
public Map getCodecFlags() {
return codecFlags;
}
@Override
public String toString() {
return tableName.getNameAsString();
}
static , T extends HBRecord> Map getCodecFlags(Class clazz) {
return new WrappedHBTable<>(clazz).codecFlags;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy