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67 changes: 67 additions & 0 deletions
67
paranamer/src/main/java/com/fasterxml/jackson/module/paranamer/SerializableParanamer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package com.fasterxml.jackson.module.paranamer; | ||
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| import java.lang.reflect.AccessibleObject; | ||
| import java.lang.reflect.AnnotatedElement; | ||
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| import com.fasterxml.jackson.databind.introspect.AnnotatedParameter; | ||
| import com.thoughtworks.paranamer.BytecodeReadingParanamer; | ||
| import com.thoughtworks.paranamer.CachingParanamer; | ||
| import com.thoughtworks.paranamer.Paranamer; | ||
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| /** | ||
| * Simple wrapper used to hide the fact that paranamer accessor itself if not JDK serializable | ||
| * in a way to keep actual <code>ObjectMapper</code> / <code>ObjectReader</code> serializable. | ||
| */ | ||
| public class SerializableParanamer | ||
| implements java.io.Serializable | ||
| { | ||
| private static final long serialVersionUID = 1L; | ||
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| protected transient Paranamer _paranamer; | ||
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| public SerializableParanamer() { | ||
| this(null); | ||
| } | ||
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| public SerializableParanamer(Paranamer paranamer) { | ||
| if (paranamer == null) { | ||
| paranamer = defaultParanamer(); | ||
| } | ||
| _paranamer = paranamer; | ||
| } | ||
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| /** | ||
| * Overridable method in case someone really wants to sub-class this implementation. | ||
| */ | ||
| protected Paranamer defaultParanamer() { | ||
| return new CachingParanamer(new BytecodeReadingParanamer()); | ||
| } | ||
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| /* | ||
| /********************************************************** | ||
| /* Public API | ||
| /********************************************************** | ||
| */ | ||
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| public String findParameterName(AnnotatedParameter param) | ||
| { | ||
| int index = param.getIndex(); | ||
| AnnotatedElement ctor = param.getOwner().getAnnotated(); | ||
| String[] names = _paranamer.lookupParameterNames((AccessibleObject) ctor, false); | ||
| if (names != null && index < names.length) { | ||
| return names[index]; | ||
| } | ||
| return null; | ||
| } | ||
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| /* | ||
| /********************************************************** | ||
| /* JDK serialization handling | ||
| /********************************************************** | ||
| */ | ||
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| Object readResolve() { | ||
| _paranamer = defaultParanamer(); | ||
| return this; | ||
| } | ||
| } |
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62 changes: 62 additions & 0 deletions
62
paranamer/src/test/java/com/fasterxml/jackson/module/paranamer/TestJDKSerializability.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package com.fasterxml.jackson.module.paranamer; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.ObjectInputStream; | ||
| import java.io.ObjectOutputStream; | ||
|
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
|
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| public class TestJDKSerializability extends ParanamerTestBase | ||
| { | ||
| static class Point { | ||
| public int x, y; | ||
| } | ||
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| public void testMapper() throws Exception | ||
| { | ||
| ObjectMapper mapper = new ObjectMapper().registerModule(new ParanamerModule()); | ||
| // first: serialize as is | ||
| byte[] ser = jdkSerialize(mapper); | ||
| ObjectMapper m2 = jdkDeserialize(ser); | ||
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| // then use lightly, repeat | ||
| byte[] rawPoint = m2.writeValueAsBytes(new Point()); | ||
| Point result = m2.readValue(rawPoint, Point.class); | ||
| assertNotNull(result); | ||
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| ser = jdkSerialize(m2); | ||
| ObjectMapper m3 = jdkDeserialize(ser); | ||
| assertNotNull(m3); | ||
| } | ||
|
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| /* | ||
| /********************************************************** | ||
| /* Helper methods | ||
| /********************************************************** | ||
| */ | ||
|
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| protected byte[] jdkSerialize(Object o) throws IOException | ||
| { | ||
| ByteArrayOutputStream bytes = new ByteArrayOutputStream(1000); | ||
| ObjectOutputStream obOut = new ObjectOutputStream(bytes); | ||
| obOut.writeObject(o); | ||
| obOut.close(); | ||
| return bytes.toByteArray(); | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| protected <T> T jdkDeserialize(byte[] raw) throws IOException | ||
| { | ||
| ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(raw)); | ||
| try { | ||
| return (T) objIn.readObject(); | ||
| } catch (ClassNotFoundException e) { | ||
| fail("Missing class: "+e.getMessage()); | ||
| return null; | ||
| } finally { | ||
| objIn.close(); | ||
| } | ||
| } | ||
| } |
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