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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.hive.service.cli;
import java.util.List;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hive.service.cli.thrift.TPrimitiveTypeEntry;
import org.apache.hive.service.cli.thrift.TTypeDesc;
import org.apache.hive.service.cli.thrift.TTypeEntry;
/**
* TypeDescriptor.
*
*/
public class TypeDescriptor {
private final Type type;
private String typeName = null;
private TypeQualifiers typeQualifiers = null;
public TypeDescriptor(Type type) {
this.type = type;
}
public TypeDescriptor(TTypeDesc tTypeDesc) {
List<TTypeEntry> tTypeEntries = tTypeDesc.getTypes();
TPrimitiveTypeEntry top = tTypeEntries.get(0).getPrimitiveEntry();
this.type = Type.getType(top.getType());
if (top.isSetTypeQualifiers()) {
setTypeQualifiers(TypeQualifiers.fromTTypeQualifiers(top.getTypeQualifiers()));
}
}
public TypeDescriptor(String typeName) {
this.type = Type.getType(typeName);
if (this.type.isComplexType()) {
this.typeName = typeName;
} else if (this.type.isQualifiedType()) {
PrimitiveTypeInfo pti = TypeInfoFactory.getPrimitiveTypeInfo(typeName);
setTypeQualifiers(TypeQualifiers.fromTypeInfo(pti));
}
}
public Type getType() {
return type;
}
public TTypeDesc toTTypeDesc() {
TPrimitiveTypeEntry primitiveEntry = new TPrimitiveTypeEntry(type.toTType());
if (getTypeQualifiers() != null) {
primitiveEntry.setTypeQualifiers(getTypeQualifiers().toTTypeQualifiers());
}
TTypeEntry entry = TTypeEntry.primitiveEntry(primitiveEntry);
TTypeDesc desc = new TTypeDesc();
desc.addToTypes(entry);
return desc;
}
public String getTypeName() {
if (typeName != null) {
return typeName;
} else {
return type.getName();
}
}
public TypeQualifiers getTypeQualifiers() {
return typeQualifiers;
}
public void setTypeQualifiers(TypeQualifiers typeQualifiers) {
this.typeQualifiers = typeQualifiers;
}
/**
* The column size for this type.
* For numeric data this is the maximum precision.
* For character data this is the length in characters.
* For datetime types this is the length in characters of the String representation
* (assuming the maximum allowed precision of the fractional seconds component).
* For binary data this is the length in bytes.
* Null is returned for for data types where the column size is not applicable.
*/
public Integer getColumnSize() {
if (type.isNumericType()) {
return getPrecision();
}
switch (type) {
case STRING_TYPE:
case BINARY_TYPE:
return Integer.MAX_VALUE;
case CHAR_TYPE:
case VARCHAR_TYPE:
return typeQualifiers.getCharacterMaximumLength();
case DATE_TYPE:
return 10;
case TIMESTAMP_TYPE:
return 29;
default:
return null;
}
}
/**
* Maximum precision for numeric types.
* Returns null for non-numeric types.
* @return
*/
public Integer getPrecision() {
if (this.type == Type.DECIMAL_TYPE) {
return typeQualifiers.getPrecision();
}
return this.type.getMaxPrecision();
}
/**
* The number of fractional digits for this type.
* Null is returned for data types where this is not applicable.
*/
public Integer getDecimalDigits() {
switch (this.type) {
case BOOLEAN_TYPE:
case TINYINT_TYPE:
case SMALLINT_TYPE:
case INT_TYPE:
case BIGINT_TYPE:
return 0;
case FLOAT_TYPE:
return 7;
case DOUBLE_TYPE:
return 15;
case DECIMAL_TYPE:
return typeQualifiers.getScale();
case TIMESTAMP_TYPE:
return 9;
default:
return null;
}
}
}
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