Allow tag prefix and filters to be set after creation

Might delete this later, so don't count on it. This is for GradleUtils
2.x backwards compatibility in 2.4.

Author: Jonathing

src/main/java/net/minecraftforge/gitver/api/GitVersion.java

@@ -23,6 +23,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.List;
 import java.util.stream.Collectors;
 
 /**
@@ -329,9 +330,38 @@ default String getBranch(boolean versionFriendly) {
     /** @return The tag prefix used when filtering tags */
     String getTagPrefix();
 
+    /**
+     * Sets the tag prefix to use when filtering tags.
+     *
+     * @param tagPrefix The tag prefix
+     * @deprecated This method only exists for backwards compatibility in GradleUtils 2.4. Using this is discouraged
+     * since it breaks the contract that the {@linkplain GitVersionConfig config} has the declarations of all the
+     * project's values, including the {@linkplain GitVersionConfig.Project#getTagPrefix() tag prefix} and any
+     * additional {@linkplain GitVersionConfig.Project#getFilters() filters}.
+     */
+    @Deprecated
+    default void setTagPrefix(String tagPrefix) { }
+
     /** @return The filters used when filtering tags (excluding the {@linkplain #getTagPrefix() tag prefix}) */
     @UnmodifiableView Collection<String> getFilters();
 
+    /** @see #setFilters(String...) */
+    default void setFilters(Collection<String> filters) {
+        this.setFilters(filters.toArray(new String[0]));
+    }
+
+    /**
+     * Sets the filters to use when filtering tags (excluding the {@linkplain #getTagPrefix() tag prefix}).
+     *
+     * @param filters The filters
+     * @deprecated This method only exists for backwards compatibility in GradleUtils 2.4. Using this is discouraged
+     * since it breaks the contract that the {@linkplain GitVersionConfig config} has the declarations of all the
+     * project's values, including the {@linkplain GitVersionConfig.Project#getTagPrefix() tag prefix} and any
+     * additional {@linkplain GitVersionConfig.Project#getFilters() filters}.
+     */
+    @Deprecated
+    default void setFilters(String... filters) { }
+
 
     /* FILE SYSTEM */
 

src/main/java/net/minecraftforge/gitver/internal/GitVersionImpl.java

@@ -21,7 +21,6 @@
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -40,12 +39,12 @@ public sealed class GitVersionImpl implements GitVersion permits GitVersionImpl.
     public final String localPath;
 
     // Config
-    private final String tagPrefix;
-    private final String[] filters;
+    private String tagPrefix;
+    private String[] filters;
     private final List<File> subprojects;
 
     // Unmodifiable views
-    private final List<String> filtersView;
+    private final Lazy<List<String>> filtersView = Lazy.of(() -> this.filters.length == 0 ? Collections.emptyList() : List.of(this.filters));
 
     public GitVersionImpl(File gitDir, File root, File project, GitVersionConfig config, boolean strict) {
         this.strict = strict;
@@ -73,8 +72,6 @@ public GitVersionImpl(File gitDir, File root, File project, GitVersionConfig con
         this.tagPrefix = projectConfig.getTagPrefix();
         this.filters = projectConfig.getFilters();
         this.subprojects = this.calculateSubprojects(config.getAllProjects());
-
-        this.filtersView = this.filters.length == 0 ? Collections.emptyList() : Collections.unmodifiableList(Arrays.asList(this.filters));
     }
 
 
@@ -211,9 +208,22 @@ public String getTagPrefix() {
         return this.tagPrefix;
     }
 
+    @Override
+    public void setTagPrefix(String tagPrefix) {
+        this.tagPrefix = tagPrefix;
+        this.info.reset();
+    }
+
     @Override
     public @UnmodifiableView Collection<String> getFilters() {
-        return this.filtersView;
+        return this.filtersView.get();
+    }
+
+    @Override
+    public void setFilters(String... filters) {
+        this.filters = filters;
+        this.filtersView.reset();
+        this.info.reset();
     }
 
 
@@ -326,7 +336,6 @@ private GitVersionImpl() {
         this.tagPrefix = "";
         this.filters = new String[0];
         this.subprojects = Collections.emptyList();
-        this.filtersView = Collections.emptyList();
     }
 
     static non-sealed class Empty extends GitVersionImpl {

src/main/java/net/minecraftforge/gitver/internal/Lazy.java

@@ -6,10 +6,11 @@
 
 import org.jetbrains.annotations.Nullable;
 
+import java.util.function.Consumer;
 import java.util.function.Supplier;
 
 final class Lazy<T> implements Supplier<T> {
-    private final Supplier<T> supplier;
+    private Supplier<T> supplier;
     private @Nullable T value;
 
     static <T> Lazy<T> of(Supplier<T> supplier) {
@@ -24,4 +25,18 @@ private Lazy(Supplier<T> supplier) {
     public T get() {
         return this.value != null ? this.value : (this.value = this.supplier.get());
     }
+
+    void reset() {
+        this.value = null;
+    }
+
+    void modify(Consumer<T> action) {
+        Supplier<T> supplier = this.value != null ? () -> this.value : this.supplier;
+        this.supplier = () -> {
+            T value = supplier.get();
+            action.accept(value);
+            return value;
+        };
+        this.value = null;
+    }
 }