JSON parser abstraction. (#2060)

jme3-plugins-json-gson/build.gradle

@@ -0,0 +1,16 @@
+sourceSets {
+    main {
+        java {
+
+            srcDir 'src/main/java'
+
+        }
+    }
+}
+
+dependencies {
+
+    api project(':jme3-plugins-json')
+    api 'com.google.code.gson:gson:2.9.1'
+
+}

jme3-plugins-json-gson/src/main/java/com/jme3/plugins/gson/GsonArray.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.plugins.gson;
+
+import java.util.Iterator;
+
+import com.jme3.plugins.json.JsonArray;
+import com.jme3.plugins.json.JsonElement;
+
+/**
+ * GSON implementation of {@link JsonArray}.
+ */
+class GsonArray extends GsonElement implements JsonArray {
+
+    GsonArray(com.google.gson.JsonElement element) {
+        super(element);
+    }
+
+    private com.google.gson.JsonArray arr() {
+        return element.getAsJsonArray();
+    }
+
+    @Override
+    public Iterator<JsonElement> iterator() {
+        return new Iterator<JsonElement>() {
+            Iterator<com.google.gson.JsonElement> it = arr().iterator();
+
+            @Override
+            public boolean hasNext() {
+                return it.hasNext();
+            }
+
+            @Override
+            public JsonElement next() {
+                return new GsonElement(it.next());
+            }
+        };
+    }
+
+    @Override
+    public JsonElement get(int i) {
+        com.google.gson.JsonElement el = arr().get(i);
+        return isNull(el) ? null : new GsonElement(el);
+    }
+
+    @Override
+    public int size() {
+        return arr().size();
+    }
+
+}

jme3-plugins-json-gson/src/main/java/com/jme3/plugins/gson/GsonElement.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.plugins.gson;
+
+import com.jme3.plugins.json.JsonArray;
+import com.jme3.plugins.json.JsonElement;
+import com.jme3.plugins.json.JsonObject;
+import com.jme3.plugins.json.JsonPrimitive;
+
+/**
+ * GSON implementation of {@link JsonElement}
+ */
+class GsonElement implements JsonElement {
+    com.google.gson.JsonElement element;
+
+    GsonElement(com.google.gson.JsonElement element) {
+        this.element = element;
+    }
+
+    protected boolean isNull(com.google.gson.JsonElement element) {
+        if (element == null) return true;
+        if (element.isJsonNull()) return true;
+        return false;
+    }
+
+    @Override
+    public String getAsString() {
+        return element.getAsString();
+    }
+
+    @Override
+    public JsonObject getAsJsonObject() {
+        return new GsonObject(element.getAsJsonObject());
+    }
+
+    @Override
+    public float getAsFloat() {
+        return element.getAsFloat();
+    }
+
+    @Override
+    public int getAsInt() {
+        return element.getAsInt();
+    }
+
+    @Override
+    public Number getAsNumber() {
+        return element.getAsNumber();        
+    }
+
+    @Override
+    public boolean getAsBoolean() {
+        return element.getAsBoolean();
+    }
+
+    @Override
+    public JsonArray getAsJsonArray() {
+        return new GsonArray(element.getAsJsonArray());
+    }
+
+    @Override
+    public JsonPrimitive getAsJsonPrimitive() {
+        return new GsonPrimitive(element.getAsJsonPrimitive());
+    }
+
+}

jme3-plugins-json-gson/src/main/java/com/jme3/plugins/gson/GsonObject.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.plugins.gson;
+
+import java.util.Set;
+import java.util.Map.Entry;
+
+import com.jme3.plugins.json.JsonArray;
+import com.jme3.plugins.json.JsonElement;
+import com.jme3.plugins.json.JsonObject;
+import com.jme3.plugins.json.JsonPrimitive;
+
+/**
+ * GSON implementation of {@link JsonObject}
+ */
+class GsonObject extends GsonElement implements JsonObject {
+
+    GsonObject(com.google.gson.JsonObject gsonObject) {
+        super(gsonObject);
+    }
+
+    private com.google.gson.JsonObject obj() {
+        return (com.google.gson.JsonObject) element;
+    }
+
+    @Override
+    public JsonArray getAsJsonArray(String string) {
+        com.google.gson.JsonArray el = obj().getAsJsonArray(string);
+        return isNull(el) ? null : new GsonArray(el);        
+    }
+
+    @Override
+    public JsonObject getAsJsonObject(String string) {
+        com.google.gson.JsonObject el = obj().getAsJsonObject(string);
+        return isNull(el) ? null : new GsonObject(el);
+    }
+
+    @Override
+    public boolean has(String string) {
+        return obj().has(string);
+    }
+
+    @Override
+    public JsonElement get(String string) {
+        com.google.gson.JsonElement el = obj().get(string);
+        return isNull(el) ? null : new GsonElement(el);
+    }
+
+    @Override
+    public Entry<String, JsonElement>[] entrySet() {
+        Set<Entry<String, com.google.gson.JsonElement>> entrySet = obj().entrySet();
+        Entry<String, JsonElement>[] entries = new Entry[entrySet.size()];
+        int i = 0;
+        for (Entry<String, com.google.gson.JsonElement> entry : entrySet) {
+
+            Entry<String, JsonElement> e = new Entry<String, JsonElement>() {
+                @Override
+                public String getKey() {
+                    return entry.getKey();
+                }
+
+                @Override
+                public GsonElement getValue() {
+                    return new GsonElement(entry.getValue());
+                }
+
+                @Override
+                public GsonElement setValue(JsonElement value) {
+                    throw new UnsupportedOperationException("Unimplemented method 'setValue'");
+                }
+            };
+
+            entries[i++] = e;
+        }
+        return entries;
+
+    }
+
+    @Override
+    public JsonPrimitive getAsJsonPrimitive(String string) {
+        com.google.gson.JsonPrimitive el= obj().getAsJsonPrimitive(string);
+        return isNull(el) ? null : new GsonPrimitive(el);
+    }
+}

jme3-plugins-json-gson/src/main/java/com/jme3/plugins/gson/GsonParser.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.plugins.gson;
+
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import com.jme3.plugins.json.JsonObject;
+import com.jme3.plugins.json.JsonParser;
+
+/**
+ * GSON implementation of {@link JsonParser}
+ */
+public class GsonParser implements JsonParser {
+    @Override
+    public JsonObject parse(InputStream stream) {
+        return new GsonObject(com.google.gson.JsonParser.parseReader(new com.google.gson.stream.JsonReader(new InputStreamReader(stream))).getAsJsonObject());
+    }
+}