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/JsonNumEquals.java

@@ -20,8 +20,8 @@
 package com.github.fge.jackson;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import 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)
     {
         /*