X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fdemoscenemusic%2Fdata%2FAbstractBase.java;h=ad5cfd8f7e27a52da793e65b94a17e8a53114934;hb=5d19c11df7ca4a969fbfe7583ca934174fb348bf;hp=2f7f3c75be0fb425783fb59341e5ea1efbf7db41;hpb=a2983e36c9603ddb43f7016f16e445e1b26bd885;p=demoscenemusic.git

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java b/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
index 2f7f3c7..ad5cfd8 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
@@ -17,15 +17,21 @@
 
 package net.pterodactylus.demoscenemusic.data;
 
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
 /**
  * TODO
  *
  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  */
-public class AbstractBase {
+public abstract class AbstractBase implements Base {
 
 	private final String id;
 
+	private final Map<String, Value<?>> attributes = new HashMap<String, Value<?>>();
+
 	protected AbstractBase(String id) {
 		this.id = id;
 	}
@@ -34,4 +40,91 @@ public class AbstractBase {
 		return id;
 	}
 
+	@SuppressWarnings({ "synthetic-access", "unchecked" })
+	protected <T> Value<T> value(String name, Class<T> clazz) {
+		if (!attributes.containsKey(name)) {
+			attributes.put(name, new Value<T>());
+		}
+		return (Value<T>) attributes.get(name);
+	}
+
+	protected boolean dirty() {
+		for (Value<?> value : attributes.values()) {
+			if (value.dirty()) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	//
+	// OBJECT METHODS
+	//
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public int hashCode() {
+		return id().hashCode();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if (!(obj instanceof Base)) {
+			return false;
+		}
+		return id().equals(((Base) obj).id());
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public String toString() {
+		StringBuilder stringBuilder = new StringBuilder();
+		stringBuilder.append(getClass().getName());
+		stringBuilder.append('[').append("id=").append(id());
+		for (Entry<String, Value<?>> attributeEntry : attributes.entrySet()) {
+			stringBuilder.append(',').append(attributeEntry.getKey()).append('=').append(attributeEntry.getValue().get());
+		}
+		stringBuilder.append(']');
+		return stringBuilder.toString();
+	}
+
+	protected static class Value<T> {
+
+		private T original;
+
+		private boolean originalSet;
+
+		private T current;
+
+		public T get() {
+			return current;
+		}
+
+		public Value<T> set(T value) {
+			if (!originalSet) {
+				original = value;
+				originalSet = true;
+			}
+			current = value;
+			return this;
+		}
+
+		public boolean dirty() {
+			return (original != null) ? !original.equals(current) : current != null;
+		}
+
+		public Value<T> commit() {
+			original = current;
+			return this;
+		}
+
+	}
+
 }