/**
* 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 "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.sqoop.schema;
import org.apache.commons.lang.StringUtils;
import org.apache.sqoop.common.SqoopException;
import org.apache.sqoop.schema.type.Column;
import java.util.Date;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/**
* Schema represents data that are being transferred.
*/
public class Schema {
/**
* Name of the schema, usually a table name.
*/
private String name;
/**
* Optional note.
*/
private String note;
/**
* Generation date.
*/
private Date creationDate;
/**
* Columns associated with the schema.
*/
private List<Column> columns;
/**
* Helper set for quick column name lookups.
*/
private Set<String> columNames;
private Schema() {
creationDate = new Date();
columns = new LinkedList<Column>();
columNames = new HashSet<String>();
}
public Schema(String name) {
this();
assert name != null;
this.name = name;
}
/**
* Add column to the schema.
*
* Add new column to the schema at the end (e.g. after all previously added
* columns). The column names must be unique and thus adding column with the
* same name will lead to an exception being thrown.
*
* @param column Column that should be added to the schema at the end.
* @return
*/
public Schema addColumn(Column column) {
if(column.getName() == null) {
throw new SqoopException(SchemaError.SCHEMA_0001, "Column: " + column);
}
if(columNames.contains(column.getName())) {
throw new SqoopException(SchemaError.SCHEMA_0002, "Column: " + column);
}
columNames.add(column.getName());
columns.add(column);
return this;
}
public String getName() {
return name;
}
public Date getCreationDate() {
return creationDate;
}
public String getNote() {
return note;
}
public Schema setNote(String note) {
this.note = note;
return this;
}
public Schema setCreationDate(Date creationDate) {
this.creationDate = creationDate;
return this;
}
public List<Column> getColumns() {
return columns;
}
public String toString() {
return new StringBuilder("Schema{")
.append("name=").append(name).append("")
.append(",columns=[\n\t").append(StringUtils.join(columns, ",\n\t")).append("]")
.append("}")
.toString();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Schema)) return false;
Schema schema = (Schema) o;
if (columns != null ? !columns.equals(schema.columns) : schema.columns != null)
return false;
if (name != null ? !name.equals(schema.name) : schema.name != null)
return false;
return true;
}
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (columns != null ? columns.hashCode() : 0);
return result;
}
}