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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 "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.drill.exec.record.metadata.schema;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.drill.exec.record.metadata.TupleMetadata;
import org.apache.drill.exec.record.metadata.TupleSchema;
import org.apache.drill.exec.record.metadata.schema.parser.SchemaExprParser;
import java.util.Map;
/**
* Holder class that contains table name, schema definition and current schema container version.
*/
@JsonInclude(JsonInclude.Include.NON_DEFAULT)
public class SchemaContainer {
private final String table;
private final TupleMetadata schema;
private final Version version;
@JsonCreator
public SchemaContainer(@JsonProperty("table") String table,
@JsonProperty("schema") TupleSchema schema,
@JsonProperty("version") Integer version) {
this.table = table;
this.schema = schema;
this.version = new Version(version);
}
public SchemaContainer(String table, String schema, Map<String, String> properties) {
this(table, schema, properties, Version.VERSION_1); //current default version
}
public SchemaContainer(String table, String schema, Map<String, String> properties, Integer version) {
this.table = table;
this.schema = schema == null ? null : convert(schema, properties);
this.version = new Version(version);
}
@JsonProperty("table")
public String getTable() {
return table;
}
@JsonProperty("schema")
public TupleMetadata getSchema() {
return schema;
}
@JsonProperty("version")
public Integer getVersionValue() {
return version.getValue();
}
@JsonIgnore
public Version getVersion() {
return version;
}
private TupleMetadata convert(String schemaString, Map<String, String> properties) {
TupleMetadata schema = SchemaExprParser.parseSchema(schemaString);
if (properties != null) {
schema.setProperties(properties);
}
return schema;
}
@Override
public String toString() {
return "SchemaContainer{" + "table='" + table + '\'' + ", schema=" + schema + ", version=" + version + '}';
}
/**
* Schema container version holder contains version in int representation.
* If during initialization null or less then 1 was given, replaces it with
* {@link #UNDEFINED_VERSION} value.
*/
public static class Version {
public static final int UNDEFINED_VERSION = -1;
public static final int VERSION_1 = 1;
// is used for testing
public static final int CURRENT_DEFAULT_VERSION = VERSION_1;
private final int value;
public Version(Integer value) {
this.value = value == null || value < 1 ? UNDEFINED_VERSION : value;
}
public int getValue() {
return value;
}
public boolean isUndefined() {
return UNDEFINED_VERSION == value;
}
public int compare(Version versionToCompare) {
return Integer.compare(value, versionToCompare.value);
}
@Override
public String toString() {
return "Version{" + "value=" + value + '}';
}
}
}
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