我正在构建Kaa project的源代码，他们使用Apache avro生成源代码。
我使用了here中的avro库作为指令，但只有“ @Deprecated”和“ public”属性，我认为它们应该是“私有”的。
这是我的.avsc文件：
{
"type":"record",
"name":"User",
"namespace":"com.example",
"fields":[
{
"name":"username",
"type":"string"
},
{
"name":"password",
"type":"string"
}
]
}
这是我的User.java：
/**
* Autogenerated by Avro
*
* DO NOT EDIT DIRECTLY
*/
package com.example;
@SuppressWarnings("all")
@org.apache.avro.specific.AvroGenerated
public class User extends org.apache.avro.specific.SpecificRecordBase implements org.apache.avro.specific.SpecificRecord {
public static final org.apache.avro.Schema SCHEMA$ = new org.apache.avro.Schema.Parser().parse("{\"type\":\"record\",\"name\":\"User\",\"namespace\":\"com.example\",\"fields\":[{\"name\":\"username\",\"type\":\"string\"},{\"name\":\"password\",\"type\":\"string\"}]}");
public static org.apache.avro.Schema getClassSchema() { return SCHEMA$; }
@Deprecated public java.lang.CharSequence username;
@Deprecated public java.lang.CharSequence password;
/**
* Default constructor. Note that this does not initialize fields
* to their default values from the schema. If that is desired then
* one should use <code>newBuilder()</code>.
*/
public User() {}
/**
* All-args constructor.
*/
public User(java.lang.CharSequence username, java.lang.CharSequence password) {
this.username = username;
this.password = password;
}
public org.apache.avro.Schema getSchema() { return SCHEMA$; }
// Used by DatumWriter. Applications should not call.
public java.lang.Object get(int field$) {
switch (field$) {
case 0: return username;
case 1: return password;
default: throw new org.apache.avro.AvroRuntimeException("Bad index");
}
}
// Used by DatumReader. Applications should not call.
@SuppressWarnings(value="unchecked")
public void put(int field$, java.lang.Object value$) {
switch (field$) {
case 0: username = (java.lang.CharSequence)value$; break;
case 1: password = (java.lang.CharSequence)value$; break;
default: throw new org.apache.avro.AvroRuntimeException("Bad index");
}
}
/**
* Gets the value of the 'username' field.
*/
public java.lang.CharSequence getUsername() {
return username;
}
/**
* Sets the value of the 'username' field.
* @param value the value to set.
*/
public void setUsername(java.lang.CharSequence value) {
this.username = value;
}
/**
* Gets the value of the 'password' field.
*/
public java.lang.CharSequence getPassword() {
return password;
}
/**
* Sets the value of the 'password' field.
* @param value the value to set.
*/
public void setPassword(java.lang.CharSequence value) {
this.password = value;
}
/** Creates a new User RecordBuilder */
public static com.example.User.Builder newBuilder() {
return new com.example.User.Builder();
}
/** Creates a new User RecordBuilder by copying an existing Builder */
public static com.example.User.Builder newBuilder(com.example.User.Builder other) {
return new com.example.User.Builder(other);
}
/** Creates a new User RecordBuilder by copying an existing User instance */
public static com.example.User.Builder newBuilder(com.example.User other) {
return new com.example.User.Builder(other);
}
/**
* RecordBuilder for User instances.
*/
public static class Builder extends org.apache.avro.specific.SpecificRecordBuilderBase<User>
implements org.apache.avro.data.RecordBuilder<User> {
private java.lang.CharSequence username;
private java.lang.CharSequence password;
/** Creates a new Builder */
private Builder() {
super(com.example.User.SCHEMA$);
}
/** Creates a Builder by copying an existing Builder */
private Builder(com.example.User.Builder other) {
super(other);
if (isValidValue(fields()[0], other.username)) {
this.username = data().deepCopy(fields()[0].schema(), other.username);
fieldSetFlags()[0] = true;
}
if (isValidValue(fields()[1], other.password)) {
this.password = data().deepCopy(fields()[1].schema(), other.password);
fieldSetFlags()[1] = true;
}
}
/** Creates a Builder by copying an existing User instance */
private Builder(com.example.User other) {
super(com.example.User.SCHEMA$);
if (isValidValue(fields()[0], other.username)) {
this.username = data().deepCopy(fields()[0].schema(), other.username);
fieldSetFlags()[0] = true;
}
if (isValidValue(fields()[1], other.password)) {
this.password = data().deepCopy(fields()[1].schema(), other.password);
fieldSetFlags()[1] = true;
}
}
/** Gets the value of the 'username' field */
public java.lang.CharSequence getUsername() {
return username;
}
/** Sets the value of the 'username' field */
public com.example.User.Builder setUsername(java.lang.CharSequence value) {
validate(fields()[0], value);
this.username = value;
fieldSetFlags()[0] = true;
return this;
}
/** Checks whether the 'username' field has been set */
public boolean hasUsername() {
return fieldSetFlags()[0];
}
/** Clears the value of the 'username' field */
public com.example.User.Builder clearUsername() {
username = null;
fieldSetFlags()[0] = false;
return this;
}
/** Gets the value of the 'password' field */
public java.lang.CharSequence getPassword() {
return password;
}
/** Sets the value of the 'password' field */
public com.example.User.Builder setPassword(java.lang.CharSequence value) {
validate(fields()[1], value);
this.password = value;
fieldSetFlags()[1] = true;
return this;
}
/** Checks whether the 'password' field has been set */
public boolean hasPassword() {
return fieldSetFlags()[1];
}
/** Clears the value of the 'password' field */
public com.example.User.Builder clearPassword() {
password = null;
fieldSetFlags()[1] = false;
return this;
}
@Override
public User build() {
try {
User record = new User();
record.username = fieldSetFlags()[0] ? this.username : (java.lang.CharSequence) defaultValue(fields()[0]);
record.password = fieldSetFlags()[1] ? this.password : (java.lang.CharSequence) defaultValue(fields()[1]);
return record;
} catch (Exception e) {
throw new org.apache.avro.AvroRuntimeException(e);
}
}
}
}
我是Java新手，所以请告诉我我不正确的地方。
答案 0 :(得分：0)
我认为没有办法将它们标记为私有，但是应该使用Builder对象创建类，并使用getter方法检索字段，而不要直接访问公共字段
答案 1 :(得分：0)
在pom.xml中，您可以指定fieldVisibility（documentation）
<!-- ... -->
<build>
<plugins>
<plugin>
<groupId>org.apache.avro</groupId>
<artifactId>avro-maven-plugin</artifactId>
<version>1.9.2</version>
<configuration>
<fieldVisibility>private</fieldVisibility>
</configuration>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>schema</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
在生成的结果代码中，字段username和password现在是私有的：
@AvroGenerated
public class User extends SpecificRecordBase implements SpecificRecord {
private static final long serialVersionUID = -203188480172108080L;
public static final Schema SCHEMA$ = (new Parser()).parse("{\"type\":\"record\",\"name\":\"User\",\"namespace\":\"com.example\",\"fields\":[{\"name\":\"username\",\"type\":\"string\"},{\"name\":\"password\",\"type\":\"string\"}]}");
private static SpecificData MODEL$ = new SpecificData();
private static final BinaryMessageEncoder<User> ENCODER;
private static final BinaryMessageDecoder<User> DECODER;
private CharSequence username;
private CharSequence password;
private static final DatumWriter<User> WRITER$;
private static final DatumReader<User> READER$;
// ...