diff options
| author | Benjamin J. Culkin <bjculkin@mix.wvu.edu> | 2017-10-08 22:39:59 -0300 |
|---|---|---|
| committer | Benjamin J. Culkin <bjculkin@mix.wvu.edu> | 2017-10-08 22:39:59 -0300 |
| commit | c82e3b3b2de0633317ec8fc85925e91422820597 (patch) | |
| tree | 96567416ce23c5ce85601f9cedc3a94bb1c55cba /base/src/main/java/bjc/utils/esodata/Directory.java | |
| parent | b3ac1c8690c3e14c879913e5dcc03a5f5e14876e (diff) | |
Start splitting into maven modules
Diffstat (limited to 'base/src/main/java/bjc/utils/esodata/Directory.java')
| -rw-r--r-- | base/src/main/java/bjc/utils/esodata/Directory.java | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/base/src/main/java/bjc/utils/esodata/Directory.java b/base/src/main/java/bjc/utils/esodata/Directory.java new file mode 100644 index 0000000..17b70f5 --- /dev/null +++ b/base/src/main/java/bjc/utils/esodata/Directory.java @@ -0,0 +1,106 @@ +package bjc.utils.esodata;
+
+/**
+ * Represents a hierarchical map.
+ *
+ * What's useful about this is that you can hand sub-directories to people and
+ * be able to ensure that they can't write outside of it.
+ *
+ * @param <K>
+ * The key type of the map.
+ * @param <V>
+ * The value type of the map.
+ */
+public interface Directory<K, V> {
+ /**
+ * Retrieves a given sub-directory.
+ *
+ * @param key
+ * The key to retrieve the sub-directory for.
+ *
+ * @return The sub-directory under that name.
+ *
+ * @throws IllegalArgumentException
+ * If the given sub-directory doesn't exist.
+ */
+ Directory<K, V> getSubdirectory(K key);
+
+ /**
+ * Check if a given sub-directory exists.
+ *
+ * @param key
+ * The key to look for the sub-directory under.
+ *
+ * @return Whether or not a sub-directory of that name exists.
+ */
+ boolean hasSubdirectory(K key);
+
+ /**
+ * Insert a sub-directory into the dictionary.
+ *
+ * @param key
+ * The name of the new sub-directory
+ * @param value
+ * The sub-directory to insert
+ *
+ * @return The old sub-directory attached to this key, or null if such a
+ * sub-directory didn't exist
+ */
+ Directory<K, V> putSubdirectory(K key, Directory<K, V> value);
+
+ /**
+ * Create a new sub-directory.
+ *
+ * Will fail if a sub-directory of that name already exists.
+ *
+ * @param key
+ * The name of the new sub-directory.
+ *
+ * @return The new sub-directory, or null if one by that name already
+ * exists.
+ */
+ default Directory<K, V> newSubdirectory(final K key) {
+ if (hasSubdirectory(key)) return null;
+
+ final Directory<K, V> dir = new SimpleDirectory<>();
+
+ putSubdirectory(key, dir);
+
+ return dir;
+ }
+
+ /**
+ * Check if the directory contains a data-item under the given key.
+ *
+ * @param key
+ * The key to check for.
+ *
+ * @return Whether or not there is a data item for the given key.
+ */
+ boolean containsKey(K key);
+
+ /**
+ * Retrieve a given data-item from the directory.
+ *
+ * @param key
+ * The key to retrieve data for.
+ *
+ * @return The value for the given key.
+ *
+ * @throws IllegalArgumentException
+ * If no value exists for the given key.
+ */
+ V getKey(K key);
+
+ /**
+ * Insert a data-item into the directory.
+ *
+ * @param key
+ * The key to insert into.
+ * @param val
+ * The value to insert.
+ *
+ * @return The old value of key, or null if such a value didn't exist.
+ */
+ V putKey(K key, V val);
+}
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