Expose cached DecoratedVersion, and introduce isSnapshot() to DecoratedVersion (#749)

Introduces a method, getDecoratedVersion() in the VersionConfig class, allowing you to easily retrieve the cached decorated version, instead of having to do versionProvider().get(), which looks less nice (imo)

Also introduces a method, isSnapshot() to DecoratedVersion, which allows you to check if the decorated version is a snapshot.
This is passed the value of VersionContact.isSnapshot().
This is convenient for checking if a version is a snapshot or not when building the project.

Co-authored-by: Bartosz Gałek <bartosz.galek@allegro.com>

Author: solonovamax

src/main/groovy/pl/allegro/tech/build/axion/release/domain/VersionConfig.groovy

@@ -244,6 +244,11 @@ abstract class VersionConfig extends BaseExtension {
         return uncachedVersionProvider().get()
     }
 
+    @Nested
+    VersionService.DecoratedVersion getDecoratedVersion() {
+        return versionProvider().get()
+    }
+
     @Input
     String getVersion() {
         return versionProvider().map({ it.decoratedVersion }).get()

src/main/java/pl/allegro/tech/build/axion/release/domain/VersionService.java

@@ -37,21 +37,23 @@ public DecoratedVersion currentDecoratedVersion(VersionProperties versionPropert
         }
 
         return new DecoratedVersion(versionContext.getVersion().toString(), finalVersion, versionContext.getPosition(),
-            versionContext.getPreviousVersion().toString());
+            versionContext.getPreviousVersion().toString(), versionContext.isSnapshot());
     }
 
     public static class DecoratedVersion {
         private final String undecoratedVersion;
         private final String decoratedVersion;
         private final ScmPosition position;
         private final String previousVersion;
+        private final boolean snapshot;
 
         public DecoratedVersion(String undecoratedVersion, String decoratedVersion, ScmPosition position,
-                                String previousVersion) {
+                                String previousVersion, boolean snapshot) {
             this.undecoratedVersion = undecoratedVersion;
             this.decoratedVersion = decoratedVersion;
             this.position = position;
             this.previousVersion = previousVersion;
+            this.snapshot = snapshot;
         }
 
         @Input
@@ -73,5 +75,10 @@ public final ScmPosition getPosition() {
         public final String getPreviousVersion() {
             return previousVersion;
         }
+
+        @Input
+        public boolean isSnapshot() {
+            return snapshot;
+        }
     }
 }