Extract ZipPaths for splitting and joining zip paths

1 files changed, 54 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/mammoth/internal/archives/ZipPaths.java b/src/main/java/org/zwobble/mammoth/internal/archives/ZipPaths.java
new file mode 100644
index 0000000..52fa2f4
--- /dev/null
+++ b/src/main/java/org/zwobble/mammoth/internal/archives/ZipPaths.java
@@ -0,0 +1,54 @@
+package org.zwobble.mammoth.internal.archives;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.Arrays.asList;
+import static org.zwobble.mammoth.internal.util.Lists.eagerFilter;
+
+public class ZipPaths {
+    private ZipPaths() {
+    }
+
+    public static class SplitPath {
+        private final String dirname;
+        private final String basename;
+
+        public SplitPath(String dirname, String basename) {
+            this.dirname = dirname;
+            this.basename = basename;
+        }
+
+        public String getDirname() {
+            return dirname;
+        }
+
+        public String getBasename() {
+            return basename;
+        }
+    }
+
+    public static SplitPath splitPath(String path) {
+        int index = path.lastIndexOf("/");
+        if (index == -1) {
+            return new SplitPath("", path);
+        } else {
+            String dirname = path.substring(0, index);
+            String basename = path.substring(index + 1);
+            return new SplitPath(dirname, basename);
+        }
+    }
+
+    public static String joinPath(String... paths) {
+        List<String> nonEmptyPaths = eagerFilter(asList(paths), path -> !path.isEmpty());
+
+        List<String> relevantPaths = new ArrayList<>();
+        for (String path : nonEmptyPaths) {
+            if (path.startsWith("/")) {
+                relevantPaths.clear();
+            }
+            relevantPaths.add(path);
+        }
+        return String.join("/", relevantPaths);
+    }
+}