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A useful utility library for java programmer using google protobuf.
/*
* Copyright (c) Baidu Inc. All rights reserved.
*
* 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 com.baidu.bjf.remoting.protobuf.code;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.baidu.bjf.remoting.protobuf.Codec;
import com.baidu.bjf.remoting.protobuf.FieldType;
import com.baidu.bjf.remoting.protobuf.utils.ClassHelper;
import com.baidu.bjf.remoting.protobuf.utils.FieldInfo;
import com.baidu.bjf.remoting.protobuf.utils.MiniTemplator;
import com.baidu.bjf.remoting.protobuf.utils.MiniTemplator.TemplateSyntaxException;
import com.baidu.bjf.remoting.protobuf.utils.StringBuilderWriter;
import com.baidu.bjf.remoting.protobuf.utils.StringUtils;
import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.WireFormat;
/**
* Code generator utility class by template engine.
*
* @author xiemalin
* @since 1.12.0
*/
public class TemplateCodeGenerator extends AbstractCodeGenerator {
/** Logger for this class. */
private static final Logger LOGGER = LoggerFactory.getLogger(TemplateCodeGenerator.class.getCanonicalName());
/** The Constant TEMPLATE_FILE. */
private static final String TEMPLATE_FILE = "/jprotobuf_classes_template.tpl";
/** The relative proxy classes. */
private Set> relativeProxyClasses = new HashSet>();
/** The templator. */
private MiniTemplator templator;
/**
* Sets the templator.
*
* @param templator the new templator
*/
public void setTemplator(MiniTemplator templator) {
this.templator = templator;
}
/**
* Gets the templator.
*
* @return the templator
*/
protected MiniTemplator getTemplator() {
return templator;
}
/**
* Instantiates a new template code generator.
*
* @param cls the cls
*/
public TemplateCodeGenerator(Class cls) {
super(cls);
InputStream templateFile = cls.getResourceAsStream(TEMPLATE_FILE);
try {
MiniTemplator templator = new MiniTemplator(TEMPLATE_FILE, templateFile);
setTemplator(templator);
} catch (TemplateSyntaxException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (IOException e) {
throw new RuntimeException("Template file locate failed. " + templateFile, e);
}
}
/**
* Gets the class name.
*
* @return the class name
*/
/*
* (non-Javadoc)
*
* @see com.baidu.bjf.remoting.protobuf.code.ICodeGenerator#getClassName()
*/
@Override
public String getClassName() {
return ClassHelper.getClassName(cls) + DEFAULT_SUFFIX_CLASSNAME;
}
/**
* Gets the code.
*
* @return the code
*/
/*
* (non-Javadoc)
*
* @see com.baidu.bjf.remoting.protobuf.code.ICodeGenerator#getCode()
*/
@Override
public String getCode() {
String pkg = getPackage();
if (!StringUtils.isEmpty(pkg)) {
pkg = "package " + pkg + ";";
}
// set package
templator.setVariable("package", pkg);
// add loop block for import packages
genImportCode();
// generate class
String className = getClassName();
templator.setVariable("className", className);
// to implements Codec interface
templator.setVariable("codecClassName", Codec.class.getName());
templator.setVariable("targetProxyClassName", getTargetProxyClassname());
// define Descriptor field
String descriptorClsName = ClassHelper.getInternalName(Descriptor.class.getCanonicalName());
templator.setVariable("descriptorClsName", descriptorClsName);
// create methods
initEncodeMethodTemplateVariable();
initDecodeMethodTemplateVariable();
StringBuilderWriter writer = new StringBuilderWriter();
try {
templator.generateOutput(writer);
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
}
return writer.toString();
}
/**
* Inits the encode method template variable.
*/
protected void initEncodeMethodTemplateVariable() {
Set orders = new HashSet();
// encode method
for (FieldInfo field : fields) {
boolean isList = field.isList();
boolean isMap = field.isMap();
// check type
if (!isList) {
checkType(field.getFieldType(), field.getField());
}
if (orders.contains(field.getOrder())) {
throw new IllegalArgumentException("Field order '" + field.getOrder() + "' on field"
+ field.getField().getName() + " already exsit.");
}
// define field
FieldType fieldType = field.getFieldType();
String accessByField = getAccessByField("t", field.getField(), cls, field.isWildcardType());
String fieldName = CodedConstant.getFieldName(field.getOrder());
String encodeFieldType = CodedConstant.getFiledType(fieldType, isList);
templator.setVariable("encodeFieldType", encodeFieldType);
templator.setVariable("encodeFieldName", fieldName);
templator.setVariable("encodeFieldGetter", accessByField);
String writeValueToField = CodedConstant.getWriteValueToField(fieldType, accessByField, isList);
templator.setVariable("writeValueToField", writeValueToField);
if (field.isRequired()) {
templator.setVariableOpt("checkNull",
CodedConstant.getRequiredCheck(field.getOrder(), field.getField()));
} else {
templator.setVariable("checkNull", "");
}
String calcSize = CodedConstant.getMappedTypeSize(field, field.getOrder(), field.getFieldType(), isList,
isMap, debug, outputPath);
templator.setVariable("calcSize", calcSize);
// set write to byte
String encodeWriteFieldValue = CodedConstant.getMappedWriteCode(field, "output", field.getOrder(),
field.getFieldType(), isList, isMap);
templator.setVariable("encodeWriteFieldValue", encodeWriteFieldValue);
templator.addBlock("encodeFields");
}
}
/**
* Inits the decode method template variable.
*/
protected void initDecodeMethodTemplateVariable() {
StringBuilder initListMapFields = new StringBuilder();
// 执行初始化，主要针对枚举类型
for (FieldInfo field : fields) {
boolean isList = field.isList();
boolean isMap = field.isMap();
String e = "";
if (isList) {
if (FieldInfo.isListType(field.getField())) {
e = "new ArrayList()";
} else if (FieldInfo.isSetType(field.getField())) {
e = "new HashSet()";
}
} else if (isMap) {
e = "new HashMap()";
}
if (isList || isMap) {
initListMapFields.append(
getSetToField("ret", field.getField(), cls, e, false, false, false, field.isWildcardType()))
.append(ClassCode.JAVA_LINE_BREAK);
}
if (field.getFieldType() == FieldType.ENUM) {
String clsName = ClassHelper.getInternalName(field.getField().getType().getCanonicalName());
if (!isList) {
String express =
"CodedConstant.getEnumValue(" + clsName + ".class, " + clsName + ".values()[0].name())";
// add set get method
String setToField = getSetToField("ret", field.getField(), cls, express, isList, field.isMap(),
false, field.isWildcardType());
templator.setVariable("enumInitialize", setToField);
templator.addBlock("enumFields");
}
}
}
templator.setVariable("initListMapFields", initListMapFields.toString());
StringBuilder code = new StringBuilder();
// 处理field解析
for (FieldInfo field : fields) {
boolean isList = field.isList();
String t = field.getFieldType().getType();
t = CodedConstant.capitalize(t);
boolean listTypeCheck = false;
String express;
String objectDecodeExpress = "";
String objectDecodeExpressSuffix = "";
String decodeOrder = "-1";
if (field.getFieldType() != FieldType.DEFAULT) {
decodeOrder = CodedConstant.makeTag(field.getOrder(),
field.getFieldType().getInternalFieldType().getWireType()) + "";
} else {
decodeOrder = "CodedConstant.makeTag(" + field.getOrder() + ",WireFormat."
+ field.getFieldType().getWireFormat() + ")";
}
templator.setVariable("decodeOrder", decodeOrder);
// enumeration type
if (field.getFieldType() == FieldType.ENUM) {
String clsName = ClassHelper.getInternalName(field.getField().getType().getCanonicalName());
if (isList) {
if (field.getGenericKeyType() != null) {
Class cls = field.getGenericKeyType();
clsName = ClassHelper.getInternalName(cls.getCanonicalName());
}
}
express = "CodedConstant.getEnumValue(" + clsName + ".class, CodedConstant.getEnumName(" + clsName
+ ".values()," + "input.read" + t + "()))";
} else {
// here is the trick way to process BigDecimal and BigInteger
if (field.getFieldType() == FieldType.BIGDECIMAL || field.getFieldType() == FieldType.BIGINTEGER) {
express = "new " + field.getFieldType().getJavaType() + "(input.read" + t + "())";
} else {
express = "input.read" + t + "()";
}
}
// if List type and element is object message type
if (isList && field.getFieldType() == FieldType.OBJECT) {
if (field.getGenericKeyType() != null) {
Class cls = field.getGenericKeyType();
checkObjectType(field, cls);
String name = ClassHelper.getInternalName(cls.getCanonicalName()); // need
// to
// parse
// nested
// class
code.append("codec = ProtobufProxy.create(").append(name).append(".class");
if (debug) {
code.append(", true");
} else {
code.append(", false");
}
String spath = "ProtobufProxy.OUTPUT_PATH.get()";
code.append(",").append(spath);
code.append(")").append(ClassCode.JAVA_LINE_BREAK);
objectDecodeExpress = code.toString();
code.setLength(0);
objectDecodeExpress += "int length = input.readRawVarint32()" + ClassCode.JAVA_LINE_BREAK;
objectDecodeExpress += "final int oldLimit = input.pushLimit(length)" + ClassCode.JAVA_LINE_BREAK;
listTypeCheck = true;
express = "(" + name + ") codec.readFrom(input)";
}
} else if (field.isMap()) {
String getMapCommand = getMapCommand(field);
if (field.isEnumKeyType()) {
String enumClassName = field.getGenericKeyType().getCanonicalName();
code.append("EnumHandler<").append(enumClassName).append("> keyhandler");
code.append("= new EnumHandler");
code.append("<").append(enumClassName).append(">() {");
code.append(ClassCode.LINE_BREAK);
code.append("public ").append(enumClassName).append(" handle(int value) {");
code.append(ClassCode.LINE_BREAK);
code.append("String enumName = CodedConstant.getEnumName(").append(enumClassName)
.append(".values(), value)");
code.append(ClassCode.JAVA_LINE_BREAK);
code.append("return ").append(enumClassName).append(".valueOf(enumName)");
code.append(ClassCode.JAVA_LINE_BREAK);
code.append("}}");
code.append(ClassCode.JAVA_LINE_BREAK);
}
if (field.isEnumValueType()) {
String enumClassName = field.getGenericeValueType().getCanonicalName();
code.append("EnumHandler<").append(enumClassName).append("> handler");
code.append("= new EnumHandler");
code.append("<").append(enumClassName).append(">() {");
code.append(ClassCode.LINE_BREAK);
code.append("public ").append(enumClassName).append(" handle(int value) {");
code.append(ClassCode.LINE_BREAK);
code.append("String enumName = CodedConstant.getEnumName(").append(enumClassName)
.append(".values(), value)");
code.append(ClassCode.JAVA_LINE_BREAK);
code.append("return ").append(enumClassName).append(".valueOf(enumName)");
code.append(ClassCode.JAVA_LINE_BREAK);
code.append("}}");
code.append(ClassCode.JAVA_LINE_BREAK);
}
objectDecodeExpress = code.toString();
code.setLength(0);
express = "CodedConstant.putMapValue(input, " + getMapCommand + ",";
express += CodedConstant.getMapFieldGenericParameterString(field);
if (field.isEnumKeyType()) {
express += ", keyhandler";
} else {
express += ", null";
}
if (field.isEnumValueType()) {
express += ", handler";
} else {
express += ", null";
}
express += ")";
} else if (field.getFieldType() == FieldType.OBJECT) { // if object
// message
// type
Class cls = field.getField().getType();
checkObjectType(field, cls);
String name = ClassHelper.getInternalName(cls.getCanonicalName()); // need
// to
// parse
// nested
// class
code.append("codec = ProtobufProxy.create(").append(name).append(".class");
if (debug) {
code.append(", true");
} else {
code.append(", false");
}
String spath = "ProtobufProxy.OUTPUT_PATH.get()";
code.append(",").append(spath);
code.append(")").append(ClassCode.JAVA_LINE_BREAK);
objectDecodeExpress = code.toString();
code.setLength(0);
objectDecodeExpress += "int length = input.readRawVarint32()" + ClassCode.JAVA_LINE_BREAK;
objectDecodeExpress += "final int oldLimit = input.pushLimit(length)" + ClassCode.JAVA_LINE_BREAK;
listTypeCheck = true;
express = "(" + name + ") codec.readFrom(input)";
}
if (field.getFieldType() == FieldType.BYTES) {
express += ".toByteArray()";
}
String decodeFieldSetValue = getSetToField("ret", field.getField(), cls, express, isList, field.isMap(),
false, field.isWildcardType()) + ClassCode.JAVA_LINE_BREAK;
if (listTypeCheck) {
objectDecodeExpressSuffix += "input.checkLastTagWas(0)" + ClassCode.JAVA_LINE_BREAK;
objectDecodeExpressSuffix += "input.popLimit(oldLimit)" + ClassCode.JAVA_LINE_BREAK;
}
if (field.isRequired()) {
templator.setVariable("deocdeCheckNull", CodedConstant.getRetRequiredCheck(
getAccessByField("ret", field.getField(), cls, field.isWildcardType()), field.getField()));
} else {
templator.setVariable("deocdeCheckNull", "");
}
String objectPackedDecodeExpress = "";
// read packed type
if (isList) {
FieldType fieldType = field.getFieldType();
if (fieldType.isPrimitive() || fieldType.isEnum()) {
code.append("if (tag == ")
.append(CodedConstant.makeTag(field.getOrder(), WireFormat.WIRETYPE_LENGTH_DELIMITED));
code.append(") {").append(ClassCode.LINE_BREAK);
code.append("int length = input.readRawVarint32()").append(ClassCode.JAVA_LINE_BREAK);
code.append("int limit = input.pushLimit(length)").append(ClassCode.JAVA_LINE_BREAK);
code.append(getSetToField("ret", field.getField(), cls, express, isList, field.isMap(), true,
field.isWildcardType()));
code.append("input.popLimit(limit)").append(ClassCode.JAVA_LINE_BREAK);
code.append("continue").append(ClassCode.JAVA_LINE_BREAK);
code.append("}").append(ClassCode.LINE_BREAK);
objectPackedDecodeExpress = code.toString();
}
}
templator.setVariable("objectPackedDecodeExpress", objectPackedDecodeExpress);
templator.setVariable("objectDecodeExpress", objectDecodeExpress);
templator.setVariable("objectDecodeExpressSuffix", objectDecodeExpressSuffix);
templator.setVariable("decodeFieldSetValue", decodeFieldSetValue);
templator.addBlock("decodeFields");
}
}
/**
* Check object type.
*
* @param field the field
* @param cls the cls
*/
private void checkObjectType(FieldInfo field, Class cls) {
if (FieldInfo.isPrimitiveType(cls)) {
throw new RuntimeException("invalid generic type for List as Object type, current type is '" + cls.getName()
+ "' on field name '" + field.getField().getDeclaringClass().getName() + "#"
+ field.getField().getName());
}
}
/**
* Gets the map command.
*
* @param field the field
* @return the map command
*/
private String getMapCommand(FieldInfo field) {
String keyGeneric;
keyGeneric = field.getGenericKeyType().getCanonicalName();
String valueGeneric;
valueGeneric = field.getGenericeValueType().getCanonicalName();
String getMapCommand = "(Map<" + keyGeneric;
getMapCommand = getMapCommand + ", " + valueGeneric + ">)";
getMapCommand = getMapCommand + getAccessByField("ret", field.getField(), cls, field.isWildcardType());
return getMapCommand;
}
/**
* Gen import code.
*/
private void genImportCode() {
Set imports = new HashSet();
imports.add("java.util.*");
imports.add("java.io.IOException");
imports.add("java.lang.reflect.*");
imports.add("com.baidu.bjf.remoting.protobuf.FieldType"); // fix the class ambiguous of FieldType
imports.add("com.baidu.bjf.remoting.protobuf.code.*");
imports.add("com.baidu.bjf.remoting.protobuf.utils.*");
imports.add("com.baidu.bjf.remoting.protobuf.*");
imports.add("com.google.protobuf.*");
if (!StringUtils.isEmpty(getPackage())) {
imports.add(getTargetProxyClassname());
}
for (String pkg : imports) {
templator.setVariable("importPackage", pkg);
templator.addBlock("imports");
}
}
/**
* Gets the relative proxy classes.
*
* @return the relative proxy classes
*/
public Set> getRelativeProxyClasses() {
return relativeProxyClasses;
}
/**
* generate access {@link Field} value source code. support public field access, getter method access and reflection
* access.
*
* @param target the target
* @param field the field
* @param cls the cls
* @param express the express
* @param isList the is list
* @param isMap the is map
* @param packed the packed
* @return the sets the to field
*/
protected String getSetToField(String target, Field field, Class cls, String express, boolean isList,
boolean isMap, boolean packed, boolean isWildType) {
StringBuilder ret = new StringBuilder();
if (isList || isMap) {
ret.append("if ((").append(getAccessByField(target, field, cls, isWildType)).append(") == null) {")
.append(ClassCode.LINE_BREAK);
}
String collectionTypetoCreate = "";
String collectionType = "";
if (FieldInfo.isListType(field)) {
collectionTypetoCreate = "new ArrayList()";
collectionType = "List";
} else if (FieldInfo.isSetType(field)) {
collectionTypetoCreate = "new HashSet()";
collectionType = "Set";
}
// if field of public modifier we can access directly
if (Modifier.isPublic(field.getModifiers()) && !isWildType) {
if (isList) {
// should initialize list
ret.append(target).append(ClassHelper.PACKAGE_SEPARATOR).append(field.getName()).append("= ")
.append(collectionTypetoCreate).append(ClassCode.JAVA_LINE_BREAK).append("}")
.append(ClassCode.LINE_BREAK);
// fix date type
if (field.getGenericType() != null
&& field.getGenericType().getTypeName().contains(Date.class.getName())) {
express = "new Date(" + express + ")";
}
if (express != null) {
if (packed) {
ret.append("while (input.getBytesUntilLimit() > 0) {").append(ClassCode.LINE_BREAK);
}
ret.append(target).append(ClassHelper.PACKAGE_SEPARATOR).append(field.getName()).append(".add(")
.append(express).append(")");
if (packed) {
ret.append(";}").append(ClassCode.LINE_BREAK);
}
}
return ret.toString();
} else if (isMap) {
ret.append(target).append(ClassHelper.PACKAGE_SEPARATOR).append(field.getName())
.append("= new HashMap()").append(ClassCode.JAVA_LINE_BREAK).append("}")
.append(ClassCode.LINE_BREAK);
return ret.append(express).toString();
}
// if date type
if (field.getType().equals(Date.class)) {
express = "new Date(" + express + ")";
}
return target + ClassHelper.PACKAGE_SEPARATOR + field.getName() + "=" + express + ClassCode.LINE_BREAK;
}
String setter = "set" + CodedConstant.capitalize(field.getName());
// check method exist
try {
cls.getMethod(setter, new Class[] { field.getType() });
if (isList) {
ret.append(collectionType).append(" __list = ").append(collectionTypetoCreate)
.append(ClassCode.JAVA_LINE_BREAK);
ret.append(target).append(ClassHelper.PACKAGE_SEPARATOR).append(setter).append("(__list)")
.append(ClassCode.JAVA_LINE_BREAK).append("}").append(ClassCode.LINE_BREAK);
// fix date type
if (field.getGenericType() != null
&& field.getGenericType().getTypeName().contains(Date.class.getName())) {
express = "new Date(" + express + ")";
}
if (express != null) {
if (packed) {
ret.append("while (input.getBytesUntilLimit() > 0) {").append(ClassCode.LINE_BREAK);
}
ret.append("(").append(getAccessByField(target, field, cls, isWildType)).append(").add(")
.append(express).append(")");
if (packed) {
ret.append(";}").append(ClassCode.LINE_BREAK);
}
}
return ret.toString();
} else if (isMap) {
ret.append("Map __map = new HashMap()").append(ClassCode.JAVA_LINE_BREAK);
ret.append(target).append(ClassHelper.PACKAGE_SEPARATOR).append(setter).append("(__map)")
.append(ClassCode.JAVA_LINE_BREAK).append("}").append(ClassCode.LINE_BREAK);
return ret + express;
}
// fix date type
if (field.getType().equals(Date.class)) {
express = "new Date(" + express + ")";
}
return target + ClassHelper.PACKAGE_SEPARATOR + setter + "(" + express + ")\n";
} catch (Exception e) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(e.getMessage(), e);
}
}
if (isList) {
ret.append(collectionType).append(" __list = ").append(collectionTypetoCreate)
.append(ClassCode.JAVA_LINE_BREAK);
ret.append("FieldUtils.setField(").append(target).append(", \"").append(field.getName())
.append("\", __list)").append(ClassCode.JAVA_LINE_BREAK).append("}").append(ClassCode.LINE_BREAK);
// fix date type
if (field.getGenericType() != null
&& field.getGenericType().getTypeName().contains(Date.class.getName())) {
express = "new Date(" + express + ")";
}
if (express != null) {
if (packed) {
ret.append("while (input.getBytesUntilLimit() > 0) {").append(ClassCode.LINE_BREAK);
}
ret.append("(").append(getAccessByField(target, field, cls, isWildType)).append(").add(")
.append(express).append(")");
if (packed) {
ret.append(";}").append(ClassCode.LINE_BREAK);
}
}
return ret.toString();
} else if (isMap) {
ret.append("Map __map = new HashMap()").append(ClassCode.JAVA_LINE_BREAK);
ret.append("FieldUtils.setField(").append(target).append(", \"").append(field.getName())
.append("\", __map)").append(ClassCode.JAVA_LINE_BREAK).append("}").append(ClassCode.LINE_BREAK);
return ret + express;
}
// use reflection to get value
String code = "";
if (express != null) {
// if date type
if (field.getType().equals(Date.class)) {
express = "new Date(" + express + ")";
}
code = "FieldUtils.setField(" + target + ", \"" + field.getName() + "\", " + express + ")"
+ ClassCode.LINE_BREAK;
}
return code;
}
}