2008-09-01 05:13:32 +02:00
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/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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2022-08-22 15:49:48 +02:00
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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import java.io.IOException;
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import java.lang.reflect.Field;
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2011-12-29 08:17:36 +01:00
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import java.lang.reflect.Modifier;
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2012-04-12 20:27:48 +02:00
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import java.lang.reflect.Type;
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2008-09-01 05:13:32 +02:00
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import junit.framework.TestCase;
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/**
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* Unit tests for {@link GsonBuilder}.
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*
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* @author Inderjeet Singh
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*/
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public class GsonBuilderTest extends TestCase {
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2012-04-12 20:27:48 +02:00
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private static final TypeAdapter<Object> NULL_TYPE_ADAPTER = new TypeAdapter<Object>() {
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@Override public void write(JsonWriter out, Object value) {
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throw new AssertionError();
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}
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@Override public Object read(JsonReader in) {
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throw new AssertionError();
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}
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};
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2008-09-01 05:13:32 +02:00
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public void testCreatingMoreThanOnce() {
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GsonBuilder builder = new GsonBuilder();
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2022-08-22 15:49:48 +02:00
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Gson gson = builder.create();
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assertNotNull(gson);
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assertNotNull(builder.create());
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builder.setFieldNamingStrategy(new FieldNamingStrategy() {
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@Override public String translateName(Field f) {
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return "test";
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}
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});
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Gson otherGson = builder.create();
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assertNotNull(otherGson);
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// Should be different instances because builder has been modified in the meantime
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assertNotSame(gson, otherGson);
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}
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/**
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* Gson instances should not be affected by subsequent modification of GsonBuilder
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* which created them.
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*/
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public void testModificationAfterCreate() {
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GsonBuilder gsonBuilder = new GsonBuilder();
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Gson gson = gsonBuilder.create();
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// Modifications of `gsonBuilder` should not affect `gson` object
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gsonBuilder.registerTypeAdapter(CustomClass1.class, new TypeAdapter<CustomClass1>() {
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@Override public CustomClass1 read(JsonReader in) throws IOException {
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throw new UnsupportedOperationException();
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}
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@Override public void write(JsonWriter out, CustomClass1 value) throws IOException {
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out.value("custom-adapter");
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}
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});
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gsonBuilder.registerTypeHierarchyAdapter(CustomClass2.class, new JsonSerializer<CustomClass2>() {
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@Override public JsonElement serialize(CustomClass2 src, Type typeOfSrc, JsonSerializationContext context) {
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return new JsonPrimitive("custom-hierarchy-adapter");
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}
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});
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gsonBuilder.registerTypeAdapter(CustomClass3.class, new InstanceCreator<CustomClass3>() {
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@Override public CustomClass3 createInstance(Type type) {
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return new CustomClass3("custom-instance");
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}
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});
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assertDefaultGson(gson);
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// New GsonBuilder created from `gson` should not have been affected by changes
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// to `gsonBuilder` either
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assertDefaultGson(gson.newBuilder().create());
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// New Gson instance from modified GsonBuilder should be affected by changes
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assertCustomGson(gsonBuilder.create());
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}
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private static void assertDefaultGson(Gson gson) {
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// Should use default reflective adapter
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String json1 = gson.toJson(new CustomClass1());
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assertEquals("{}", json1);
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// Should use default reflective adapter
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String json2 = gson.toJson(new CustomClass2());
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assertEquals("{}", json2);
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// Should use default instance creator
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CustomClass3 customClass3 = gson.fromJson("{}", CustomClass3.class);
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assertEquals(CustomClass3.NO_ARG_CONSTRUCTOR_VALUE, customClass3.s);
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}
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private static void assertCustomGson(Gson gson) {
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String json1 = gson.toJson(new CustomClass1());
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assertEquals("\"custom-adapter\"", json1);
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String json2 = gson.toJson(new CustomClass2());
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assertEquals("\"custom-hierarchy-adapter\"", json2);
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CustomClass3 customClass3 = gson.fromJson("{}", CustomClass3.class);
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assertEquals("custom-instance", customClass3.s);
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}
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static class CustomClass1 { }
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static class CustomClass2 { }
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static class CustomClass3 {
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static final String NO_ARG_CONSTRUCTOR_VALUE = "default instance";
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final String s;
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public CustomClass3(String s) {
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this.s = s;
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}
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public CustomClass3() {
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this(NO_ARG_CONSTRUCTOR_VALUE);
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}
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2008-09-01 05:13:32 +02:00
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}
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2011-12-29 08:17:36 +01:00
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public void testExcludeFieldsWithModifiers() {
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Gson gson = new GsonBuilder()
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.excludeFieldsWithModifiers(Modifier.VOLATILE, Modifier.PRIVATE)
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.create();
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assertEquals("{\"d\":\"d\"}", gson.toJson(new HasModifiers()));
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}
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2012-03-11 22:43:38 +01:00
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@SuppressWarnings("unused")
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2011-12-29 08:17:36 +01:00
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static class HasModifiers {
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private String a = "a";
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volatile String b = "b";
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private volatile String c = "c";
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String d = "d";
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}
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public void testTransientFieldExclusion() {
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Gson gson = new GsonBuilder()
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.excludeFieldsWithModifiers()
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.create();
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assertEquals("{\"a\":\"a\"}", gson.toJson(new HasTransients()));
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}
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static class HasTransients {
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transient String a = "a";
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}
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2021-12-31 00:08:18 +01:00
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2022-08-22 15:49:48 +02:00
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public void testRegisterTypeAdapterForCoreType() {
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Type[] types = {
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byte.class,
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int.class,
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double.class,
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Short.class,
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Long.class,
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String.class,
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};
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for (Type type : types) {
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new GsonBuilder().registerTypeAdapter(type, NULL_TYPE_ADAPTER);
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}
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}
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2021-12-31 00:08:18 +01:00
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public void testDisableJdkUnsafe() {
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Gson gson = new GsonBuilder()
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.disableJdkUnsafe()
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.create();
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try {
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gson.fromJson("{}", ClassWithoutNoArgsConstructor.class);
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fail("Expected exception");
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} catch (JsonIOException expected) {
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assertEquals(
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"Unable to create instance of class com.google.gson.GsonBuilderTest$ClassWithoutNoArgsConstructor; "
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+ "usage of JDK Unsafe is disabled. Registering an InstanceCreator or a TypeAdapter for this type, "
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+ "adding a no-args constructor, or enabling usage of JDK Unsafe may fix this problem.",
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expected.getMessage()
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);
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}
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}
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private static class ClassWithoutNoArgsConstructor {
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@SuppressWarnings("unused")
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public ClassWithoutNoArgsConstructor(String s) {
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}
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}
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2008-09-01 05:13:32 +02:00
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}
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