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Added PostConstruct Factory sample in Extras.

This commit is contained in:
Inderjeet Singh 2016-09-16 17:35:34 -07:00
parent 2271525dd5
commit 4512f31c69
3 changed files with 139 additions and 8 deletions
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21
extras/pom.xml
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@ -40,9 +40,14 @@
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.3.1</version>
<version>2.7</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>jsr250-api</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
@ -86,16 +91,16 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<version>3.5.1</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.5</version>
<version>3.0.2</version>
<executions>
<execution>
<phase>package</phase>
@ -113,7 +118,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.4</version>
<version>3.0.1</version>
<executions>
<execution>
<id>attach-sources</id>
@ -127,7 +132,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.10.1</version>
<version>2.10.4</version>
<executions>
<execution>
<id>attach-javadocs</id>
@ -147,7 +152,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<version>2.10</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>

76
extras/src/main/java/com/google/gson/typeadapters/PostConstructAdapterFactory.java Normal file
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@ -0,0 +1,76 @@
/*
* Copyright (C) 2016 Gson Authors
*
* Licensed 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.google.gson.typeadapters;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.annotation.PostConstruct;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
public class PostConstructAdapterFactory implements TypeAdapterFactory {
// copied from https://gist.github.com/swankjesse/20df26adaf639ed7fd160f145a0b661a
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
for (Class<?> t = type.getRawType(); t != Object.class; t = t.getSuperclass()) {
for (Method m : t.getDeclaredMethods()) {
if (m.isAnnotationPresent(PostConstruct.class)) {
m.setAccessible(true);
TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
return new PostConstructAdapter<T>(delegate, m);
}
}
}
return null;
}
final static class PostConstructAdapter<T> extends TypeAdapter<T> {
private final TypeAdapter<T> delegate;
private final Method method;
public PostConstructAdapter(TypeAdapter<T> delegate, Method method) {
this.delegate = delegate;
this.method = method;
}
@Override public T read(JsonReader in) throws IOException {
T result = delegate.read(in);
if (result != null) {
try {
method.invoke(result);
} catch (IllegalAccessException e) {
throw new AssertionError();
} catch (InvocationTargetException e) {
if (e.getCause() instanceof RuntimeException) throw (RuntimeException) e.getCause();
throw new RuntimeException(e.getCause());
}
}
return result;
}
@Override public void write(JsonWriter out, T value) throws IOException {
delegate.write(out, value);
}
}
}

50
extras/src/test/java/com/google/gson/typeadapters/PostConstructAdapterFactoryTest.java Normal file
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@ -0,0 +1,50 @@
/*
* Copyright (C) 2016 Gson Authors
*
* Licensed 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.google.gson.typeadapters;
import javax.annotation.PostConstruct;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import junit.framework.TestCase;
public class PostConstructAdapterFactoryTest extends TestCase {
public void test() throws Exception {
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(new PostConstructAdapterFactory())
.create();
gson.fromJson("{\"bread\": \"white\", \"cheese\": \"cheddar\"}", Sandwich.class);
try {
gson.fromJson("{\"bread\": \"cheesey bread\", \"cheese\": \"swiss\"}", Sandwich.class);
fail();
} catch (IllegalArgumentException expected) {
assertEquals("too cheesey", expected.getMessage());
}
}
static class Sandwich {
String bread;
String cheese;
@PostConstruct void validate() {
if (bread.equals("cheesey bread") && cheese != null) {
throw new IllegalArgumentException("too cheesey");
}
}
}
}