CAUSEWAY-2297: any/all match support for Can<T>

apache · Nov 13, 2024 · b3bd742 · b3bd742
1 parent aa6aa2b
commit b3bd742
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Showing 4 changed files with 43 additions and 0 deletions.
diff --git a/commons/src/main/java/org/apache/causeway/commons/collections/Can.java b/commons/src/main/java/org/apache/causeway/commons/collections/Can.java
@@ -679,6 +679,18 @@ default Can<T> addUnique(final @Nullable T element) {
      */
     int indexOf(@Nullable T element);
 
+    // -- MATCH
+
+    /**
+     * Returns whether any elements of this {@link Can} match the provided
+     * predicate.
+     */
+    boolean anyMatch(final Predicate<? super T> predicate);
+    /**
+     * Returns whether all elements of this stream match the provided predicate.
+     */
+    boolean allMatch(final Predicate<? super T> predicate);
+
     // -- EQUALITY
 
     /**

diff --git a/commons/src/main/java/org/apache/causeway/commons/collections/Can_Empty.java b/commons/src/main/java/org/apache/causeway/commons/collections/Can_Empty.java
@@ -237,6 +237,15 @@ public int indexOf(final @Nullable T element) {
         return -1;
     }
 
+    @Override
+    public boolean anyMatch(final Predicate<? super T> predicate) {
+        return false;
+    }
+    @Override
+    public boolean allMatch(final Predicate<? super T> predicate) {
+        return true;
+    }
+
     @Override
     public String toString() {
         return "Can[]";

diff --git a/commons/src/main/java/org/apache/causeway/commons/collections/Can_Multiple.java b/commons/src/main/java/org/apache/causeway/commons/collections/Can_Multiple.java
@@ -365,6 +365,19 @@ public int indexOf(final @Nullable T element) {
         return this.elements.indexOf(element);
     }
 
+    @Override
+    public boolean anyMatch(final Predicate<? super T> predicate) {
+        // equivalent to stream().anyMatch(predicate); hoping the loop is faster..
+        for(var el : elements) if(predicate.test(el)) return true;
+        return false;
+    }
+    @Override
+    public boolean allMatch(final Predicate<? super T> predicate) {
+        // equivalent to stream().allMatch(predicate); hoping the loop is faster..
+        for(var el : elements) if(!predicate.test(el)) return false;
+        return true;
+    }
+
     @Override
     public String toString() {
         var literal = stream()

diff --git a/commons/src/main/java/org/apache/causeway/commons/collections/Can_Singleton.java b/commons/src/main/java/org/apache/causeway/commons/collections/Can_Singleton.java
@@ -329,6 +329,15 @@ public int indexOf(final @Nullable T element) {
         return this.element.equals(element) ? 0 : -1;
     }
 
+    @Override
+    public boolean anyMatch(final Predicate<? super T> predicate) {
+        return predicate.test(element);
+    }
+    @Override
+    public boolean allMatch(final Predicate<? super T> predicate) {
+        return predicate.test(element);
+    }
+
     @Override
     public String toString() {
         return "Can["+element+"]";