org.apache.thrift.partial.ThriftMetadata Maven / Gradle / Ivy
Show all versions of libthrift Show documentation
/*
* 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.thrift.partial;
import org.apache.commons.lang3.StringUtils;
import org.apache.thrift.TBase;
import org.apache.thrift.TFieldIdEnum;
import org.apache.thrift.TFieldRequirementType;
import org.apache.thrift.TUnion;
import org.apache.thrift.meta_data.FieldMetaData;
import org.apache.thrift.meta_data.FieldValueMetaData;
import org.apache.thrift.meta_data.ListMetaData;
import org.apache.thrift.meta_data.MapMetaData;
import org.apache.thrift.meta_data.SetMetaData;
import org.apache.thrift.meta_data.StructMetaData;
import org.apache.thrift.partial.Validate;
import org.apache.thrift.protocol.TType;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Container for Thrift metadata classes such as {@link ThriftPrimitive},
* {@link ThriftList}, etc.
*
* This class is mainly used by {@code TDeserializer}.
*/
public class ThriftMetadata {
enum FieldTypeEnum implements TFieldIdEnum {
ROOT((short) 0, "root"),
ENUM((short) 1, "enum"),
LIST_ELEMENT((short) 2, "listElement"),
MAP_KEY((short) 3, "mapKey"),
MAP_VALUE((short) 4, "mapValue"),
SET_ELEMENT((short) 5, "setElement");
private short id;
private String name;
FieldTypeEnum(short id, String name) {
this.id = id;
this.name = name;
}
@Override
public short getThriftFieldId() {
return id;
}
@Override
public String getFieldName() {
return name;
}
}
private enum ComparisonResult {
UNKNOWN,
EQUAL,
NOT_EQUAL
}
/**
* Base class of field types that can be partially deserialized.
*
* Holds metadata necessary for partial deserialization.
* The metadata is internally computed and used; therefore it is not visible to
* the users of {@code TDeserializer}.
*/
public abstract static class ThriftObject implements Serializable {
public final ThriftObject parent;
public final TFieldIdEnum fieldId;
public final FieldMetaData data;
// Placeholder to attach additional data. This class or its descendents
// do not try to access or interpret this field.
public Object additionalData;
ThriftObject(ThriftObject parent, TFieldIdEnum fieldId, FieldMetaData data) {
this.parent = parent;
this.fieldId = fieldId;
this.data = data;
}
/**
* Converts this instance to formatted and indented string representation.
*
* @param sb the {@code StringBuilder} to add formatted strings to.
* @param level the current indent level.
*/
protected abstract void toPrettyString(StringBuilder sb, int level);
/**
* Gets a space string whose length is proportional to the given indent level.
*/
protected String getIndent(int level) {
return StringUtils.repeat(" ", level * 4);
}
/**
* Helper method to append a formatted string to the given {@code StringBuilder}.
*/
protected void append(StringBuilder sb, String format, Object... args) {
sb.append(String.format(format, args));
}
/**
* Gets the name of this field.
*/
protected String getName() {
return this.fieldId.getFieldName();
}
protected List noFields = Collections.emptyList();
protected String getSubElementName(TFieldIdEnum fieldId) {
return getSubElementName(fieldId, "element");
}
protected String getSubElementName(TFieldIdEnum fieldId, String suffix) {
return String.format("%s_%s", fieldId.getFieldName(), suffix);
}
private static class Factory {
static ThriftObject createNew(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
List fields) {
byte fieldType = data.valueMetaData.type;
switch (fieldType) {
case TType.STRUCT:
return ThriftStructBase.create(parent, fieldId, data, fields);
case TType.LIST:
return new ThriftList(parent, fieldId, data, fields);
case TType.MAP:
return new ThriftMap(parent, fieldId, data, fields);
case TType.SET:
return new ThriftSet(parent, fieldId, data, fields);
case TType.ENUM:
return new ThriftEnum(parent, fieldId, data);
case TType.BOOL:
case TType.BYTE:
case TType.I16:
case TType.I32:
case TType.I64:
case TType.DOUBLE:
case TType.STRING:
return new ThriftPrimitive(parent, fieldId, data);
default:
throw unsupportedFieldTypeException(fieldType);
}
}
}
}
/**
* Metadata about primitive types.
*/
public static class ThriftPrimitive extends ThriftObject {
ThriftPrimitive(ThriftObject parent, TFieldIdEnum fieldId, FieldMetaData data) {
super(parent, fieldId, data);
}
public boolean isBinary() {
return this.data.valueMetaData.isBinary();
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
String fieldType = this.getTypeName();
this.append(sb, "%s%s %s;\n", this.getIndent(level), fieldType, this.getName());
}
private String getTypeName() {
byte fieldType = this.data.valueMetaData.type;
switch (fieldType) {
case TType.BOOL:
return "bool";
case TType.BYTE:
return "byte";
case TType.I16:
return "i16";
case TType.I32:
return "i32";
case TType.I64:
return "i64";
case TType.DOUBLE:
return "double";
case TType.STRING:
if (this.isBinary()) {
return "binary";
} else {
return "string";
}
default:
throw unsupportedFieldTypeException(fieldType);
}
}
}
public static class ThriftEnum extends ThriftObject {
private static EnumCache enums = new EnumCache();
ThriftEnum(ThriftObject parent, TFieldIdEnum fieldId, FieldMetaData data) {
super(parent, fieldId, data);
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
this.append(sb, "%senum %s;\n", this.getIndent(level), this.getName());
}
}
/**
* Metadata of container like objects: list, set, map
*/
public abstract static class ThriftContainer extends ThriftObject {
public ThriftContainer(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data) {
super(parent, fieldId, data);
}
public abstract boolean hasUnion();
}
public static class ThriftList extends ThriftContainer {
public final ThriftObject elementData;
ThriftList(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
List fields) {
super(parent, fieldId, data);
this.elementData = ThriftObject.Factory.createNew(
this,
FieldTypeEnum.LIST_ELEMENT,
new FieldMetaData(
getSubElementName(fieldId),
TFieldRequirementType.REQUIRED,
((ListMetaData) data.valueMetaData).elemMetaData),
fields);
}
@Override
public boolean hasUnion() {
return this.elementData instanceof ThriftUnion;
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
this.append(sb, "%slist<\n", this.getIndent(level));
this.elementData.toPrettyString(sb, level + 1);
this.append(sb, "%s> %s;\n", this.getIndent(level), this.getName());
}
}
public static class ThriftSet extends ThriftContainer {
public final ThriftObject elementData;
ThriftSet(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
List fields) {
super(parent, fieldId, data);
this.elementData = ThriftObject.Factory.createNew(
this,
FieldTypeEnum.SET_ELEMENT,
new FieldMetaData(
getSubElementName(fieldId),
TFieldRequirementType.REQUIRED,
((SetMetaData) data.valueMetaData).elemMetaData),
fields);
}
@Override
public boolean hasUnion() {
return this.elementData instanceof ThriftUnion;
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
this.append(sb, "%sset<\n", this.getIndent(level));
this.elementData.toPrettyString(sb, level + 1);
this.append(sb, "%s> %s;\n", this.getIndent(level), this.getName());
}
}
public static class ThriftMap extends ThriftContainer {
public final ThriftObject keyData;
public final ThriftObject valueData;
ThriftMap(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
List fields) {
super(parent, fieldId, data);
this.keyData = ThriftObject.Factory.createNew(
this,
FieldTypeEnum.MAP_KEY,
new FieldMetaData(
getSubElementName(fieldId, "key"),
TFieldRequirementType.REQUIRED,
((MapMetaData) data.valueMetaData).keyMetaData),
Collections.emptyList());
this.valueData = ThriftObject.Factory.createNew(
this,
FieldTypeEnum.MAP_VALUE,
new FieldMetaData(
getSubElementName(fieldId, "value"),
TFieldRequirementType.REQUIRED,
((MapMetaData) data.valueMetaData).valueMetaData),
fields);
}
@Override
public boolean hasUnion() {
return (this.keyData instanceof ThriftUnion) || (this.valueData instanceof ThriftUnion);
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
this.append(sb, "%smap<\n", this.getIndent(level));
this.append(sb, "%skey = {\n", this.getIndent(level + 1));
this.keyData.toPrettyString(sb, level + 2);
this.append(sb, "%s},\n", this.getIndent(level + 1));
this.append(sb, "%svalue = {\n", this.getIndent(level + 1));
this.valueData.toPrettyString(sb, level + 2);
this.append(sb, "%s}\n", this.getIndent(level + 1));
this.append(sb, "%s> %s;\n", this.getIndent(level), this.getName());
}
}
/**
* Base class for metadata of ThriftStruct and ThriftUnion.
* Holds functionality that is common to both.
*/
public abstract static class ThriftStructBase extends ThriftObject {
public ThriftStructBase(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data) {
super(parent, fieldId, data);
}
public Class getStructClass() {
return getStructClass(this.data);
}
public static Class getStructClass(FieldMetaData data) {
return (Class) ((StructMetaData) data.valueMetaData).structClass;
}
public boolean isUnion() {
return isUnion(this.data);
}
public static boolean isUnion(FieldMetaData data) {
return TUnion.class.isAssignableFrom(getStructClass(data));
}
public static ThriftStructBase create(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
Iterable fieldsData) {
if (isUnion(data)) {
return new ThriftUnion(parent, fieldId, data, fieldsData);
} else {
return new ThriftStruct(parent, fieldId, data, fieldsData);
}
}
}
/**
* Metadata of a Thrift union.
* Currently not adequately supported.
*/
public static class ThriftUnion extends ThriftStructBase {
public ThriftUnion(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
Iterable fieldsData) {
super(parent, fieldId, data);
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
String indent = this.getIndent(level);
String indent2 = this.getIndent(level + 1);
this.append(sb, "%sunion %s {\n", indent, this.getName());
this.append(sb, "%s// unions not adequately supported at present.\n", indent2);
this.append(sb, "%s}\n", indent);
}
}
/**
* Metadata of a Thrift struct.
*/
public static class ThriftStruct extends ThriftStructBase {
public final Map fields;
ThriftStruct(
ThriftObject parent,
TFieldIdEnum fieldId,
FieldMetaData data,
Iterable fieldsData) {
super(parent, fieldId, data);
Class clasz = getStructClass(data);
this.fields = getFields(this, clasz, fieldsData);
}
public T createNewStruct() {
T instance = null;
try {
Class structClass = getStructClass(this.data);
instance = (T) structClass.newInstance();
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
return instance;
}
public static ThriftStruct of(Class clasz) {
return ThriftStruct.fromFields(clasz, Collections.emptyList());
}
public static ThriftStruct fromFieldNames(
Class clasz,
Collection fieldNames) {
return fromFields(clasz, ThriftField.fromNames(fieldNames));
}
public static ThriftStruct fromFields(
Class clasz,
Iterable fields) {
Validate.checkNotNull(clasz, "clasz");
Validate.checkNotNull(fields, "fields");
return new ThriftStruct(
null,
FieldTypeEnum.ROOT,
new FieldMetaData(
FieldTypeEnum.ROOT.getFieldName(),
TFieldRequirementType.REQUIRED,
new StructMetaData(TType.STRUCT, clasz)),
fields);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
this.toPrettyString(sb, 0);
return sb.toString();
}
@Override
protected void toPrettyString(StringBuilder sb, int level) {
String indent = this.getIndent(level);
String indent2 = this.getIndent(level + 1);
this.append(sb, "%sstruct %s {\n", indent, this.getName());
if (this.fields.size() == 0) {
this.append(sb, "%s*;", indent2);
} else {
List ids = new ArrayList(this.fields.keySet());
Collections.sort(ids);
for (Integer id : ids) {
this.fields.get(id).toPrettyString(sb, level + 1);
}
}
this.append(sb, "%s}\n", indent);
}
private static Map getFields(
ThriftStruct parent,
Class clasz,
Iterable fieldsData) {
Map fieldsMetaData =
FieldMetaData.getStructMetaDataMap(clasz);
Map fields = new HashMap();
boolean getAllFields = !fieldsData.iterator().hasNext();
if (getAllFields) {
for (Map.Entry entry : fieldsMetaData.entrySet()) {
TFieldIdEnum fieldId = entry.getKey();
FieldMetaData fieldMetaData = entry.getValue();
ThriftObject field =
ThriftObject.Factory.createNew(parent, fieldId, fieldMetaData, Collections.emptyList());
fields.put((int) fieldId.getThriftFieldId(), field);
}
} else {
for (ThriftField fieldData : fieldsData) {
String fieldName = fieldData.name;
FieldMetaData fieldMetaData = findFieldMetaData(fieldsMetaData, fieldName);
TFieldIdEnum fieldId = findFieldId(fieldsMetaData, fieldName);
ThriftObject field =
ThriftObject.Factory.createNew(parent, fieldId, fieldMetaData, fieldData.fields);
fields.put((int) fieldId.getThriftFieldId(), field);
}
}
return fields;
}
private static FieldMetaData findFieldMetaData(
Map fieldsMetaData,
String fieldName) {
for (FieldMetaData fieldData : fieldsMetaData.values()) {
if (fieldData.fieldName.equals(fieldName)) {
return fieldData;
}
}
throw fieldNotFoundException(fieldName);
}
private static TFieldIdEnum findFieldId(
Map fieldsMetaData,
String fieldName) {
for (TFieldIdEnum fieldId : fieldsMetaData.keySet()) {
if (fieldId.getFieldName().equals(fieldName)) {
return fieldId;
}
}
throw fieldNotFoundException(fieldName);
}
}
static IllegalArgumentException fieldNotFoundException(String fieldName) {
return new IllegalArgumentException("field not found: '" + fieldName + "'");
}
static UnsupportedOperationException unsupportedFieldTypeException(byte fieldType) {
return new UnsupportedOperationException("field type not supported: '" + fieldType + "'");
}
}