Shaded classes from Guava to keep the API stable

project.gradle

@@ -31,8 +31,8 @@ targetCompatibility = JavaVersion.VERSION_1_7; // defaults to sourceCompatibilit
 dependencies {
     implementation(group: "com.fasterxml.jackson.core", name: "jackson-databind", version: "2.9.9");
     implementation(group: "com.github.fge", name: "msg-simple", version: "1.1");
-    implementation(group: "com.google.code.findbugs", name: "jsr305", version: "2.0.1");
-    testImplementation(group: "org.testng", name: "testng", version: "6.8.7") {
+    implementation(group: "com.google.code.findbugs", name: "jsr305", version: "3.0.2");
+    testImplementation(group: "org.testng", name: "testng", version: "7.0.0-beta1") {
         exclude(group: "junit", module: "junit");
         exclude(group: "org.beanshell", module: "bsh");
         exclude(group: "org.yaml", module: "snakeyaml");

src/main/java/com/github/fge/jackson/JacksonUtils.java

@@ -99,7 +99,7 @@ public static Map<String, JsonNode> asMap(final JsonNode node)
             return Collections.emptyMap();
 
         final Iterator<Map.Entry<String, JsonNode>> iterator = node.fields();
-        final Map<String, JsonNode> ret = new HashMap<String, JsonNode>();
+        final Map<String, JsonNode> ret = new HashMap<>();
 
         Map.Entry<String, JsonNode> entry;
 
@@ -108,7 +108,7 @@ public static Map<String, JsonNode> asMap(final JsonNode node)
             ret.put(entry.getKey(), entry.getValue());
         }
 
-        return ret;
+        return Collections.unmodifiableMap(ret);
     }
 
     /**

src/main/java/com/github/fge/jackson/JsonNumEquals.java

@@ -20,8 +20,8 @@
 package com.github.fge.jackson;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.github.fge.jackson.com.google.common.base.Equivalence;
 
-import javax.annotation.Nullable;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
@@ -41,50 +41,21 @@
  * kind of equality.</p>
  */
 public final class JsonNumEquals
+    extends Equivalence<JsonNode>
 {
-    private static final JsonNumEquals INSTANCE
+    private static final Equivalence<JsonNode> INSTANCE
         = new JsonNumEquals();
 
     private JsonNumEquals()
     {
     }
 
-    public static JsonNumEquals getInstance()
+    public static Equivalence<JsonNode> getInstance()
     {
         return INSTANCE;
     }
 
-    /**
-     * Returns {@code true} if the given objects are considered equivalent.
-     *
-     * <p>The {@code equivalent} method implements an equivalence relation on object references:
-     *
-     * <ul>
-     * <li>It is <i>reflexive</i>: for any reference {@code x}, including null, {@code
-     *     equivalent(x, x)} returns {@code true}.
-     * <li>It is <i>symmetric</i>: for any references {@code x} and {@code y}, {@code
-     *     equivalent(x, y) == equivalent(y, x)}.
-     * <li>It is <i>transitive</i>: for any references {@code x}, {@code y}, and {@code z}, if
-     *     {@code equivalent(x, y)} returns {@code true} and {@code equivalent(y, z)} returns {@code
-     *     true}, then {@code equivalent(x, z)} returns {@code true}.
-     * <li>It is <i>consistent</i>: for any references {@code x} and {@code y}, multiple invocations
-     *     of {@code equivalent(x, y)} consistently return {@code true} or consistently return {@code
-     *     false} (provided that neither {@code x} nor {@code y} is modified).
-     * </ul>
-     * @param a x
-     * @param b y
-     * @return whether nodes are equal according to IETF RFCs
-     */
-    public final boolean equivalent(@Nullable JsonNode a, @Nullable JsonNode b) {
-        if (a == b) {
-            return true;
-        }
-        if (a == null || b == null) {
-            return false;
-        }
-        return doEquivalent(a, b);
-    }
-
+    @Override
     protected boolean doEquivalent(final JsonNode a, final JsonNode b)
     {
         /*
@@ -122,31 +93,7 @@ protected boolean doEquivalent(final JsonNode a, final JsonNode b)
         return typeA == NodeType.ARRAY ? arrayEquals(a, b) : objectEquals(a, b);
     }
 
-    /**
-     * Returns a hash code for {@code t}.
-     *
-     * <p>The {@code hash} has the following properties:
-     * <ul>
-     * <li>It is <i>consistent</i>: for any reference {@code x}, multiple invocations of
-     *     {@code hash(x}} consistently return the same value provided {@code x} remains unchanged
-     *     according to the definition of the equivalence. The hash need not remain consistent from
-     *     one execution of an application to another execution of the same application.
-     * <li>It is <i>distributable across equivalence</i>: for any references {@code x} and {@code y},
-     *     if {@code equivalent(x, y)}, then {@code hash(x) == hash(y)}. It is <i>not</i> necessary
-     *     that the hash be distributable across <i>inequivalence</i>. If {@code equivalence(x, y)}
-     *     is false, {@code hash(x) == hash(y)} may still be true.
-     * <li>{@code hash(null)} is {@code 0}.
-     * </ul>
-     * @param t node to hash
-     * @return hash
-     */
-    public final int hash(@Nullable JsonNode t) {
-        if (t == null) {
-            return 0;
-        }
-        return doHash(t);
-    }
-
+    @Override
     protected int doHash(final JsonNode t)
     {
         /*
@@ -236,7 +183,7 @@ private boolean objectEquals(final JsonNode a, final JsonNode b)
         /*
          * Grab the key set from the first node
          */
-        final Set<String> keys = new HashSet<String>();
+        final Set<String> keys = new HashSet<>();
         Iterator<String> iterator1 = a.fieldNames();
         while (iterator1.hasNext()) {
             final String next = iterator1.next();
@@ -251,7 +198,7 @@ private boolean objectEquals(final JsonNode a, final JsonNode b)
          * Grab the key set from the second node, and see if both sets are the
          * same. If not, objects are not equal, no need to check for children.
          */
-        final Set<String> set = new HashSet<String>();
+        final Set<String> set = new HashSet<>();
         Iterator<String> iterator2 = b.fieldNames();
         while (iterator2.hasNext()) {
             final String next = iterator2.next();

src/main/java/com/github/fge/jackson/NodeType.java

@@ -86,7 +86,7 @@ public enum NodeType
      * #getNodeType(JsonNode)})
      */
     private static final Map<JsonToken, NodeType> TOKEN_MAP
-        = new EnumMap<JsonToken, NodeType>(JsonToken.class);
+        = new EnumMap<>(JsonToken.class);
 
     static {
         TOKEN_MAP.put(JsonToken.START_ARRAY, ARRAY);
@@ -99,7 +99,7 @@ public enum NodeType
         TOKEN_MAP.put(JsonToken.VALUE_STRING, STRING);
 
         final Map<String, NodeType> builder
-            = new HashMap<String, NodeType>();
+            = new HashMap<>();
 
         for (final NodeType type: NodeType.values())
             builder.put(type.name, type);