BAEL-2412

javiermediavilla2 · javiermediavilla2 · commit f2d258a20561 · 2018-12-03T21:53:58.000+01:00
Working with primitive values in Gson.
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/all_primitive_values/fromJsonPrimitiveTypes.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/all_primitive_values/fromJsonPrimitiveTypes.java
@@ -0,0 +1,17 @@
+package com.baeldung.gson_primitive_types.all_primitive_values;
+
+import com.baeldung.gson_primitive_types.models.GsonBundle;
+import com.google.gson.Gson;
+
+public class fromJsonPrimitiveTypes {
+    public static void main(String[] args) {
+        String json = "{\"value\": 17, \"shortValue\": 3, \"intValue\": 3, "
+            + "\"longValue\": 3, \"floatValue\": 3.5" + ", \"doubleValue\": 3.5"
+            + ", \"booleanValue\": true, \"charValue\": \"a\"}";
+
+        Gson gson = new Gson();
+        GsonBundle gsonBundle = gson.fromJson(json, GsonBundle.class);
+
+        System.out.println(gsonBundle);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/all_primitive_values/toJsonPrimitiveTypes.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/all_primitive_values/toJsonPrimitiveTypes.java
@@ -0,0 +1,13 @@
+package com.baeldung.gson_primitive_types.all_primitive_values;
+
+import com.baeldung.gson_primitive_types.models.GsonBundle;
+import com.google.gson.Gson;
+
+public class toJsonPrimitiveTypes {
+    public static void main(String[] args) {
+        GsonBundle gsonBundle = new GsonBundle();
+        Gson gson = new Gson();
+
+        System.out.println(gson.toJson(gsonBundle));
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonIntegerRepresentationBooleanValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonIntegerRepresentationBooleanValue.java
@@ -0,0 +1,17 @@
+package com.baeldung.gson_primitive_types.boolean_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBoolean;
+import com.baeldung.gson_primitive_types.models.GsonFloat;
+import com.google.gson.Gson;
+
+public class JsonIntegerRepresentationBooleanValue {
+    public static void main(String[] args) {
+        // Raises exception.
+        String json = "{\"value\": 1}";
+        Gson gson = new Gson();
+
+        GsonBoolean model = gson.fromJson(json, GsonBoolean.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonInvalidValueWithinStringBooleanValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonInvalidValueWithinStringBooleanValue.java
@@ -0,0 +1,16 @@
+package com.baeldung.gson_primitive_types.boolean_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBoolean;
+import com.google.gson.Gson;
+
+public class JsonInvalidValueWithinStringBooleanValue {
+    public static void main(String[] args) {
+        // It is ignored.
+        String json = "{\"value\": \"15x\"}";
+        Gson gson = new Gson();
+
+        GsonBoolean model = gson.fromJson(json, GsonBoolean.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonYesRepresentationBooleanValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/boolean_value/JsonYesRepresentationBooleanValue.java
@@ -0,0 +1,16 @@
+package com.baeldung.gson_primitive_types.boolean_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBoolean;
+import com.google.gson.Gson;
+
+public class JsonYesRepresentationBooleanValue {
+    public static void main(String[] args) {
+        // It fails silently.
+        String json = "{\"value\": yes}";
+        Gson gson = new Gson();
+
+        GsonBoolean model = gson.fromJson(json, GsonBoolean.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/byte_value/ToJsonBitString.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/byte_value/ToJsonBitString.java
@@ -0,0 +1,27 @@
+package com.baeldung.gson_primitive_types.byte_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.*;
+
+import java.lang.reflect.Type;
+
+public class ToJsonBitString {
+    public static void main(String[] args) {
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(GsonBitString.class, new GsonBitStringSerializer());
+
+        Gson gson = builder.create();
+        GsonBitString model = new GsonBitString();
+        model.value = (byte) 0b1111;
+
+        System.out.println(gson.toJson(model));
+    }
+
+    static class GsonBitStringSerializer implements JsonSerializer<GsonBitString> {
+        @Override public JsonElement serialize(GsonBitString gsonBundle, Type type, JsonSerializationContext jsonSerializationContext) {
+            JsonObject jsonObject = new JsonObject();
+            jsonObject.addProperty("value", Integer.toBinaryString(gsonBundle.value));
+            return jsonObject;
+        }
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/byte_value/fromJsonBitString.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/byte_value/fromJsonBitString.java
@@ -0,0 +1,28 @@
+package com.baeldung.gson_primitive_types.byte_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.*;
+
+import java.lang.reflect.Type;
+
+public class fromJsonBitString {
+    public static void main(String[] args) {
+        String json = "{\"value\": \"1111\"}";
+        GsonBuilder gsonBuilder = new GsonBuilder();
+        gsonBuilder.registerTypeAdapter(GsonBitString.class, new GsonBitStringDeserializer());
+
+        Gson gson = gsonBuilder.create();
+
+        System.out.println(gson.fromJson(json, GsonBitString.class));
+    }
+
+    static class GsonBitStringDeserializer implements JsonDeserializer<GsonBitString> {
+        @Override public GsonBitString deserialize(JsonElement jsonElement,
+            Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
+            GsonBitString gsonBitString = new GsonBitString();
+            gsonBitString.value = (byte) Integer.parseInt(
+                jsonElement.getAsJsonObject().getAsJsonPrimitive("value").getAsString(), 2);
+            return gsonBitString;
+        }
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/char_value/JsonUnicodeCharValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/char_value/JsonUnicodeCharValue.java
@@ -0,0 +1,16 @@
+package com.baeldung.gson_primitive_types.char_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.baeldung.gson_primitive_types.models.GsonLatinChar;
+import com.google.gson.Gson;
+
+public class JsonUnicodeCharValue {
+    public static void main(String[] args) {
+        // The field is converted.
+        Gson gson = new Gson();
+        String json = "{\"value\": \"\\u00AE\"}";
+        GsonLatinChar model = gson.fromJson(json, GsonLatinChar.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBitString.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBitString.java
@@ -0,0 +1,9 @@
+package com.baeldung.gson_primitive_types.models;
+
+public class GsonBitString {
+    public byte value = (byte) 1;
+
+    public String toString() {
+        return "{byte: " + value + "}";
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBoolean.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBoolean.java
@@ -0,0 +1,9 @@
+package com.baeldung.gson_primitive_types.models;
+
+public class GsonBoolean {
+    public boolean value;
+
+    public String toString() {
+        return "{boolean: " + value + "}";
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBundle.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonBundle.java
@@ -0,0 +1,19 @@
+package com.baeldung.gson_primitive_types.models;
+
+public class GsonBundle {
+    public byte byteValue = (byte) 0x00001111;
+    public short shortValue = (short) 3;
+    public int intValue = 3;
+    public long longValue = 3;
+    public float floatValue = 3.5f;
+    public double doubleValue = 3.5;
+    public boolean booleanValue = true;
+    public char charValue = 'a';
+
+    public String toString() {
+        return "{" + "byte: " + byteValue + ", " + "short: " + shortValue + ", "
+            + "int: " + intValue + ", " + "long: " + longValue + ", " + "float: "
+            + floatValue + ", " + "double: " + doubleValue + ", " + "boolean: "
+            + booleanValue + ", " + "char: " + charValue + "}";
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonFloat.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonFloat.java
@@ -0,0 +1,9 @@
+package com.baeldung.gson_primitive_types.models;
+
+public class GsonFloat {
+    public float value;
+
+    public String toString() {
+        return "{float: " + value + "}";
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonLatinChar.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/models/GsonLatinChar.java
@@ -0,0 +1,9 @@
+package com.baeldung.gson_primitive_types.models;
+
+public class GsonLatinChar {
+    public char value;
+
+    public String toString() {
+        return "{char: " + value + "}";
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonNonCompatibleNumberTypeValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonNonCompatibleNumberTypeValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.number_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonNonCompatibleNumberTypeValue {
+    public static void main(String[] args) {
+        // Raises an exception.
+        Gson gson = new Gson();
+        String json = "{\"value\": 2.3}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonOverflowValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonOverflowValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.number_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonOverflowValue {
+    public static void main(String[] args) {
+        // Overflow happens unnoticed.
+        Gson gson = new Gson();
+        String json = "{\"value\": \"300\"}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonPrecissionMismatchValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/number_value/JsonPrecissionMismatchValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.number_value;
+
+import com.baeldung.gson_primitive_types.models.GsonFloat;
+import com.google.gson.Gson;
+
+public class JsonPrecissionMismatchValue {
+    public static void main(String[] args) {
+        String json = "{\"value\": 12.123456789123456}";
+        Gson gson = new Gson();
+
+        GsonFloat model = gson.fromJson(json, GsonFloat.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonEmptyValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonEmptyValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.special_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonEmptyValue {
+    public static void main(String[] args) {
+        // Raises an exception.
+        Gson gson = new Gson();
+        String json = "{\"value\": \"\"}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonInvalidStringValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonInvalidStringValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.special_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonInvalidStringValue {
+    public static void main(String[] args) {
+        // Raises an exception.
+        Gson gson = new Gson();
+        String json = "{\"value\": \"15x\"}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonInvalidValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonInvalidValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.special_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonInvalidValue {
+    public static void main(String[] args) {
+        // Raises an exception.
+        Gson gson = new Gson();
+        String json = "{\"value\": s15s}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonNullValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonNullValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.special_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonNullValue {
+    public static void main(String[] args) {
+        // The field will just be ignored.
+        Gson gson = new Gson();
+        String json = "{\"value\": null}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
diff --git a/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonValidStringValue.java b/gson/src/main/java/org/baeldung/gson/gsonprimitivetypes/special_value/JsonValidStringValue.java
@@ -0,0 +1,15 @@
+package com.baeldung.gson_primitive_types.special_value;
+
+import com.baeldung.gson_primitive_types.models.GsonBitString;
+import com.google.gson.Gson;
+
+public class JsonValidStringValue {
+    public static void main(String[] args) {
+        // The field is converted.
+        Gson gson = new Gson();
+        String json = "{\"value\": \"15\"}";
+        GsonBitString model = gson.fromJson(json, GsonBitString.class);
+
+        System.out.println(model);
+    }
+}
