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/*
* Copyright 2010-2011 Ning, Inc.
*
* Ning 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 com.ning.metrics.goodwill.access;
import com.google.common.collect.ImmutableMap;
import com.ning.metrics.serialization.schema.SchemaField;
import com.ning.metrics.serialization.schema.SchemaFieldType;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.annotate.JsonValue;
import org.codehaus.jackson.map.ObjectMapper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Describe a SchemaField in Goodwill.
* This is basically the union of a SchemaField and extra metadata for the SQL sink.
*
* @see com.ning.metrics.serialization.schema.SchemaField
*/
public class GoodwillSchemaField
{
private static final ObjectMapper mapper = new ObjectMapper();
public static final String JSON_THRIFT_FIELD_NAME = "name";
public static final String JSON_THRIFT_FIELD_TYPE = "type";
public static final String JSON_THRIFT_FIELD_ID = "position";
public static final String JSON_THRIFT_FIELD_DESCRIPTION = "description";
/*
* When storing the thrifts in a database/datawarehouse, use these fields to describe
* the associated sql type and length.
* Given the large range of data types (Netezza, Oracle, MySQL, ...), no enforcement
* is performed (plain Strings).
*/
public static final String JSON_THRIFT_FIELD_SQL_KEY = "sql";
public static final String JSON_THRIFT_FIELD_SQL_TYPE = "type";
public static final String JSON_THRIFT_FIELD_SQL_LENGTH = "length";
public static final String JSON_THRIFT_FIELD_SQL_SCALE = "scale";
public static final String JSON_THRIFT_FIELD_SQL_PRECISION = "precision";
private final SchemaField schemaField;
private final String description;
private Sql sql;
/**
* Jackson constructor
*
* {
* "name": "myField",
* "type": "string",
* "position": 1,
* "description": "string",
* "sql": {
* "type": "nvarchar",
* "length": 255,
* "scale": null,
* "precision": null
* }
*
* @param name Schema field name
* @param type Schema field type. This is not necessarily a Thrift type. @see SchemaFieldType
* @param id field position
* @param description Short description of the field
* @param sql SQL object (used by the sink)
*/
@JsonCreator
@SuppressWarnings("unused")
public GoodwillSchemaField(
@JsonProperty(JSON_THRIFT_FIELD_NAME) final String name,
@JsonProperty(JSON_THRIFT_FIELD_TYPE) final String type,
@JsonProperty(JSON_THRIFT_FIELD_ID) final short id,
@JsonProperty(JSON_THRIFT_FIELD_DESCRIPTION) final String description,
@JsonProperty(JSON_THRIFT_FIELD_SQL_KEY) final Sql sql
)
{
this(name, type, id, description, sql == null ? null : sql.getType(), sql == null ? null : sql.getLength(), sql == null ? null : sql.getScale(), sql == null ? null : sql.getPrecision());
}
/**
* Manual constructor, typically used by Goodwill stores.
*
* @param name Schema field name
* @param type Schema field type. This is not necessarily a Thrift type. @see SchemaFieldType
* @param id field position
* @param description Short description of the field
* @param sqlType SQL type (varchar, int, ...)
* @param sqlLength SQL type length
* @param sqlScale SQL type scale
* @param sqlPrecision SQL type precision
*/
public GoodwillSchemaField(
final String name,
final String type,
final short id,
final String description,
final String sqlType,
final Integer sqlLength,
final Integer sqlScale,
final Integer sqlPrecision
)
{
if (name == null) {
throw new IllegalArgumentException("GoodwillSchemaField name can't be null");
}
if ((sqlType == null || sqlType.equals("string")) && (sqlScale != null || sqlPrecision != null)) {
throw new IllegalArgumentException("Strings cannot have a scale or precision");
}
this.schemaField = SchemaFieldType.createSchemaField(name, type, id);
// Optional fields
sql = new Sql(sqlType, sqlLength, sqlScale, sqlPrecision);
this.description = description;
}
public GoodwillSchemaField(final SchemaField field)
{
this(field.getName(), field.getType().name(), field.getId(), null, null);
}
public static GoodwillSchemaField decode(final String thriftItemJson) throws IOException
{
return mapper.readValue(thriftItemJson, GoodwillSchemaField.class);
}
@JsonValue
@SuppressWarnings({"unchecked", "unused"})
public ImmutableMap toMap()
{
return new ImmutableMap.Builder()
.put(JSON_THRIFT_FIELD_NAME, getName())
.put(JSON_THRIFT_FIELD_TYPE, getType())
.put(JSON_THRIFT_FIELD_ID, getId())
.put(JSON_THRIFT_FIELD_DESCRIPTION, getDescription() == null ? "" : getDescription())
.put(JSON_THRIFT_FIELD_SQL_KEY, getSql() == null ? "" : getSql())
.build();
}
/**
* Extra information for the SQL Sink
*/
public static class Sql
{
private final String type;
private final Integer length;
private final Integer scale;
private final Integer precision;
@JsonCreator
public Sql(
@JsonProperty(JSON_THRIFT_FIELD_SQL_TYPE) final String type,
@JsonProperty(JSON_THRIFT_FIELD_SQL_LENGTH) final Integer length,
@JsonProperty(JSON_THRIFT_FIELD_SQL_SCALE) final Integer scale,
@JsonProperty(JSON_THRIFT_FIELD_SQL_PRECISION) final Integer precision)
{
this.type = type;
this.length = length;
this.scale = scale;
this.precision = precision;
}
@JsonValue
@SuppressWarnings({"unchecked", "unused"})
public ImmutableMap toMap()
{
return new ImmutableMap.Builder()
.put(JSON_THRIFT_FIELD_SQL_TYPE, getType() == null ? "" : getType())
.put(JSON_THRIFT_FIELD_SQL_LENGTH, getLength() == null ? "" : getLength())
.put(JSON_THRIFT_FIELD_SQL_SCALE, getScale() == null ? "" : getScale())
.put(JSON_THRIFT_FIELD_SQL_PRECISION, getPrecision() == null ? "" : getPrecision())
.build();
}
public String getType()
{
return type;
}
public Integer getLength()
{
return length;
}
public Integer getScale()
{
return scale;
}
public Integer getPrecision()
{
return precision;
}
}
public String getName()
{
return schemaField.getName();
}
public SchemaFieldType getType()
{
return schemaField.getType();
}
public short getId()
{
return schemaField.getId();
}
public Sql getSql()
{
return sql;
}
public String getDescription()
{
return description;
}
@Override
public String toString()
{
try {
return toJSON().toString();
}
catch (JsonGenerationException e) {
return "GoodwillSchemaField{" +
JSON_THRIFT_FIELD_NAME + "='" + getName() + '\'' +
", " + JSON_THRIFT_FIELD_TYPE + "='" + getType() + '\'' +
", " + JSON_THRIFT_FIELD_ID + "=" + getId() +
", " + JSON_THRIFT_FIELD_SQL_TYPE + "='" + sql.type + '\'' +
", " + JSON_THRIFT_FIELD_SQL_LENGTH + "=" + sql.length +
", " + JSON_THRIFT_FIELD_SQL_SCALE + "=" + sql.scale +
", " + JSON_THRIFT_FIELD_SQL_PRECISION + "=" + sql.precision +
", " + JSON_THRIFT_FIELD_DESCRIPTION + "=" + description +
'}';
}
catch (IOException e) {
return "GoodwillSchemaField{" +
JSON_THRIFT_FIELD_NAME + "='" + getName() + '\'' +
", " + JSON_THRIFT_FIELD_TYPE + "='" + getType() + '\'' +
", " + JSON_THRIFT_FIELD_ID + "=" + getId() +
", " + JSON_THRIFT_FIELD_SQL_TYPE + "='" + sql.type + '\'' +
", " + JSON_THRIFT_FIELD_SQL_LENGTH + "=" + sql.length +
", " + JSON_THRIFT_FIELD_SQL_SCALE + "=" + sql.scale +
", " + JSON_THRIFT_FIELD_SQL_PRECISION + "=" + sql.precision +
", " + JSON_THRIFT_FIELD_DESCRIPTION + "=" + description +
'}';
}
}
/**
* Create a JSON representation of the GoodwillSchemaField. It will always contain
* the name, type and position. Description and SQL attributes are however
* optional.
*
* @return JSONObject containing all fields
* @throws IOException if a serialization exception occurs
* @throws JsonGenerationException if a serialization exception occurs
*/
public ByteArrayOutputStream toJSON() throws IOException
{
final ByteArrayOutputStream out = new ByteArrayOutputStream();
mapper.writeValue(out, this);
return out;
}
/**
* Pretty print the SQL type.
* TODO: add layer of abstraction, too Netezza specific
*
* @return a human readable representation of the SQL type
*/
@SuppressWarnings("unused")
public String getFullSQLType()
{
String fullSQLType = null;
if (sql.type == null) {
return null;
}
else if (sql.type.equals("decimal") || sql.type.equals("numeric")) {
if (sql.precision != null) {
if (sql.scale != null) {
fullSQLType = sql.type + "(" + sql.precision + ", " + sql.scale + ")";
}
else {
fullSQLType = sql.type + "(" + sql.precision + ")";
}
}
}
else {
if (sql.type.equals("nvarchar") || sql.type.equals("varchar")) {
if (sql.length != null) {
fullSQLType = sql.type + "(" + sql.length + ")";
}
}
}
if (fullSQLType == null) {
fullSQLType = sql.type;
}
return fullSQLType;
}
}
