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deserialization work

This commit is contained in:
eugenp 2014-08-23 12:50:27 +03:00
parent ade4f14702
commit 2e48d26ff5
11 changed files with 149 additions and 169 deletions
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12
gson/src/main/resources/example1.json
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@ -1,12 +0,0 @@
{
"collection": [
{
"name": "Test order1",
"detail": "ahk ks"
},
{
"name": "Test order2",
"detail": "Fisteku"
}
]
}

10
gson/src/main/resources/example2.json
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@ -1,10 +0,0 @@
[
{
"name": "Test order1",
"detail": "ahk ks"
},
{
"name": "Test order2",
"detail": "Fisteku"
}
]

47
gson/src/test/java/org/baeldung/gson/deserialization/Foo.java Normal file
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@ -0,0 +1,47 @@
package org.baeldung.gson.deserialization;
public class Foo {
public int intValue;
public String stringValue;
public Foo(final int intValue, final String stringValue) {
this.intValue = intValue;
this.stringValue = stringValue;
}
// API
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + intValue;
result = prime * result + ((stringValue == null) ? 0 : stringValue.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Foo other = (Foo) obj;
if (intValue != other.intValue)
return false;
if (stringValue == null) {
if (other.stringValue != null)
return false;
} else if (!stringValue.equals(other.stringValue))
return false;
return true;
}
@Override
public String toString() {
return "TargetClass{" + "intValue= " + intValue + ", stringValue= " + stringValue + '}';
}
}

26
gson/src/test/java/org/baeldung/gson/deserialization/FooDeserializer.java Normal file
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@ -0,0 +1,26 @@
package org.baeldung.gson.deserialization;
import java.lang.reflect.Type;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
public class FooDeserializer implements JsonDeserializer<Foo[]> {
@Override
public Foo[] deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
final JsonArray jArray = json.getAsJsonArray();
final Foo[] scArray = new Foo[jArray.size()];
int index = 0;
for (final JsonElement jElement : jArray) {
final int i = jElement.getAsJsonObject().get("intValue").getAsInt();
final String s = jElement.getAsJsonObject().get("stringValue").getAsString();
scArray[index++] = new Foo(i, s);
}
return scArray;
}
}

21
gson/src/test/java/org/baeldung/gson/deserialization/FooDeserializerFromJsonWithDifferentFields.java Normal file
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@ -0,0 +1,21 @@
package org.baeldung.gson.deserialization;
import java.lang.reflect.Type;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
public class FooDeserializerFromJsonWithDifferentFields implements JsonDeserializer<Foo> {
@Override
public Foo deserialize(final JsonElement jElement, final Type typeOfT, final JsonDeserializationContext context) throws JsonParseException {
final JsonObject jObject = jElement.getAsJsonObject();
final int intValue = jObject.get("valueInt").getAsInt();
final String stringValue = jObject.get("valueString").getAsString();
return new Foo(intValue, stringValue);
}
}

4
gson/src/test/java/org/baeldung/gson/deserialization/GenericTargetClass.java → gson/src/test/java/org/baeldung/gson/deserialization/GenericFoo.java
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@ -1,10 +1,10 @@
package org.baeldung.gson.deserialization;
public class GenericTargetClass<INTEGER> {
public class GenericFoo<INTEGER> {
public INTEGER intField;
GenericTargetClass(final INTEGER value) {
GenericFoo(final INTEGER value) {
intField = value;
}

32
gson/src/test/java/org/baeldung/gson/deserialization/SourceClass.java
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@ -1,32 +0,0 @@
package org.baeldung.gson.deserialization;
public class SourceClass {
int intValue;
String stringValue;
public SourceClass(int intValue, String stringValue) {
this.intValue = intValue;
this.stringValue = stringValue;
}
@Override
public String toString() {
return "SourceClass{" +
"intValue=" + intValue +
", stringValue='" + stringValue + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof SourceClass)) return false;
SourceClass that = (SourceClass) o;
if (intValue != that.intValue) return false;
if (!stringValue.equals(that.stringValue)) return false;
return true;
}
}

25
gson/src/test/java/org/baeldung/gson/deserialization/SourceClassDeserializer.java
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@ -1,25 +0,0 @@
package org.baeldung.gson.deserialization;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import java.lang.reflect.Type;
public class SourceClassDeserializer implements JsonDeserializer<SourceClass[]> {
@Override
public SourceClass[] deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
JsonArray jArray = json.getAsJsonArray();
SourceClass[] scArray = new SourceClass[jArray.size()];
int index = 0;
for (JsonElement jElement : jArray) {
int i = jElement.getAsJsonObject().get("intValue").getAsInt();
String s = jElement.getAsJsonObject().get("stringValue").getAsString();
scArray[index++] = new SourceClass(i, s);
}
return scArray;
}
}

19
gson/src/test/java/org/baeldung/gson/deserialization/TargetClass.java
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@ -1,19 +0,0 @@
package org.baeldung.gson.deserialization;
public class TargetClass {
public int intValue;
public String stringValue;
public TargetClass(final int intValue, final String stringValue) {
this.intValue = intValue;
this.stringValue = stringValue;
}
// API
@Override
public String toString() {
return "TargetClass{" + "intValue= " + intValue + ", stringValue= " + stringValue + '}';
}
}

21
gson/src/test/java/org/baeldung/gson/deserialization/TargetClassDeserializer.java
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@ -1,21 +0,0 @@
package org.baeldung.gson.deserialization;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import java.lang.reflect.Type;
public class TargetClassDeserializer implements JsonDeserializer<TargetClass> {
@Override
public TargetClass deserialize(JsonElement jElement, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
JsonObject jObject = jElement.getAsJsonObject();
int intValue = jObject.get("valueInt").getAsInt();
String stringValue = jObject.get("valueString").getAsString();
return new TargetClass(intValue, stringValue);
}
}

101
gson/src/test/java/org/baeldung/gson/deserialization/test/GsonDeserializationTest.java
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@ -1,6 +1,8 @@
package org.baeldung.gson.deserialization.test;
import static org.hamcrest.Matchers.hasItem;
import static org.hamcrest.Matchers.instanceOf;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
@ -10,11 +12,9 @@ import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.baeldung.gson.deserialization.GenericTargetClass;
import org.baeldung.gson.deserialization.SourceClass;
import org.baeldung.gson.deserialization.SourceClassDeserializer;
import org.baeldung.gson.deserialization.TargetClass;
import org.baeldung.gson.deserialization.TargetClassDeserializer;
import org.baeldung.gson.deserialization.Foo;
import org.baeldung.gson.deserialization.FooDeserializerFromJsonWithDifferentFields;
import org.baeldung.gson.deserialization.GenericFoo;
import org.junit.Test;
import com.google.gson.Gson;
@ -26,33 +26,67 @@ import com.google.gson.reflect.TypeToken;
public class GsonDeserializationTest {
// tests - single element
@Test
public void givenJsonHasDissimilarFieldNamesButGsonMapsRight_whenUsingCustomDeserializer_thenCorrect() {
public final void givenJsonHasExtraValuesButGsonIsIgnoringExtras_whenDeserializing_thenCorrect() {
final String serializedSourceObject = "{\"intValue\":1,\"stringValue\":\"one\",\"extraString\":\"two\",\"extraFloat\":2.2}";
final Foo targetObject = new Gson().fromJson(serializedSourceObject, Foo.class);
assertEquals(targetObject.intValue, 1);
assertEquals(targetObject.stringValue, "one");
}
@Test
public final void givenJsonHasNonMatchingFieldNames_whenDeserializingWithCustomDeserializer_thenCorrect() {
final String jsonSourceObject = "{\"valueInt\":7,\"valueString\":\"seven\"}";
final GsonBuilder gsonBldr = new GsonBuilder();
gsonBldr.registerTypeAdapter(TargetClass.class, new TargetClassDeserializer());
final Gson gson = gsonBldr.create();
final TargetClass targetObject = gson.fromJson(jsonSourceObject, TargetClass.class);
gsonBldr.registerTypeAdapter(Foo.class, new FooDeserializerFromJsonWithDifferentFields());
final Foo targetObject = gsonBldr.create().fromJson(jsonSourceObject, Foo.class);
assertEquals(targetObject.intValue, 7);
assertEquals(targetObject.stringValue, "seven");
}
@Test
public void givenJsonWithArray_whenUsingGsonCustomDeserializer_thenMapsToArrayList() {
// It is necessary to override the equals() method in SourceClass
public final void givenUsingGson_whenDeserializingGeneric_thenCorrect() {
final Type genericTargetClassType = new TypeToken<GenericFoo<Integer>>() {
}.getType();
final String serializedSourceObject = "{\"intField\":1}";
final GenericFoo<Integer> targetObject = new Gson().fromJson(serializedSourceObject, genericTargetClassType);
assertEquals(targetObject.intField, new Integer(1));
}
// tests - multiple elements
@Test
public final void givenJsonArrayOfFoos_whenDeserializingToList_thenCorrect() {
final String jsonSourceObject = "[{\"intValue\":1,\"stringValue\":\"one\"},{\"intValue\":2,\"stringValue\":\"two\"}]";
final GsonBuilder gsonBldr = new GsonBuilder();
gsonBldr.registerTypeHierarchyAdapter(SourceClass[].class, new SourceClassDeserializer());
final Gson gson = gsonBldr.create();
final Foo[] objectsAsArray = new GsonBuilder().create().fromJson(jsonSourceObject, Foo[].class);
final List<Foo> targetList = Arrays.asList(objectsAsArray);
final List<SourceClass> targetList = Arrays.asList(gson.fromJson(jsonSourceObject, SourceClass[].class));
assertEquals(new SourceClass(1, "one"), targetList.get(0));
assertThat(targetList, hasItem(new Foo(1, "one")));
assertThat(targetList, hasItem(new Foo(2, "two")));
assertThat(targetList, not(hasItem(new Foo(1, "two"))));
}
@Test
public void givenJsonHasDissimilarFieldNamesButGsonMapsRight_whenDeserializingManualy_thenCorrect() {
public final void givenUsingGson_whenDeserializingCollection_thenCorrect() {
final String serializedSourceCollection = "[{\"intValue\":1,\"stringValue\":\"one\"},{\"intValue\":2,\"stringValue\":\"two\"}]";
final Type targetClassType = new TypeToken<ArrayList<Foo>>() {
}.getType();
final Collection<Foo> targetCollection = new Gson().fromJson(serializedSourceCollection, targetClassType);
assertThat(targetCollection, instanceOf(ArrayList.class));
}
//
@Test
public void whenDeserializingJsonIntoElements_thenCorrect() {
final String jsonSourceObject = "{\"valueInt\":7,\"valueString\":\"seven\"}";
final JsonParser jParser = new JsonParser();
final JsonElement jElement = jParser.parse(jsonSourceObject);
@ -60,39 +94,10 @@ public class GsonDeserializationTest {
final int intValue = jObject.get("valueInt").getAsInt();
final String stringValue = jObject.get("valueString").getAsString();
final TargetClass targetObject = new TargetClass(intValue, stringValue);
final Foo targetObject = new Foo(intValue, stringValue);
assertEquals(targetObject.intValue, 7);
assertEquals(targetObject.stringValue, "seven");
}
@Test
public void givenJsonHasExtraValuesButGsonIsIgnoringExtras_whenDeserializing_thenCorrect() {
final String serializedSourceObject = "{\"intValue\":1,\"stringValue\":\"one\",\"extraString\":\"two\",\"extraFloat\":2.2}";
final TargetClass targetObject = new Gson().fromJson(serializedSourceObject, TargetClass.class);
assertEquals(targetObject.intValue, 1);
assertEquals(targetObject.stringValue, "one");
}
@Test
public void givenUsingGson_whenDeserializingGeneric_thenCorrect() {
final Type genericTargetClassType = new TypeToken<GenericTargetClass<Integer>>() {
}.getType();
final String serializedSourceObject = "{\"intField\":1}";
final GenericTargetClass<Integer> targetObject = new Gson().fromJson(serializedSourceObject, genericTargetClassType);
assertEquals(targetObject.intField, new Integer(1));
}
@Test
public void givenUsingGson_whenDeserializingCollection_thenCorrect() {
final String serializedSourceCollection = "[{\"intValue\":1,\"stringValue\":\"one\"},{\"intValue\":2,\"stringValue\":\"two\"}]";
final Type targetClassType = new TypeToken<ArrayList<TargetClass>>() {
}.getType();
final Collection<TargetClass> targetCollection = new Gson().fromJson(serializedSourceCollection, targetClassType);
assertThat(targetCollection, instanceOf(ArrayList.class));
}
}