bdi4jade

diff --git a/bdi-jade/src/bdi4jade/goal/AbstractBeliefGoal.java b/bdi-jade/src/bdi4jade/goal/AbstractBeliefGoal.java
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+++ b/bdi-jade/src/bdi4jade/goal/AbstractBeliefGoal.java
@@ -0,0 +1,123 @@
+//----------------------------------------------------------------------------
+// Copyright (C) 2011  Ingrid Nunes
+// 
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// 
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+// 
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+// 
+// To contact the authors:
+// http://inf.ufrgs.br/prosoft/bdi4jade/
+//
+//----------------------------------------------------------------------------
+
+package bdi4jade.goal;
+
+import bdi4jade.annotation.Parameter;
+import bdi4jade.annotation.Parameter.Direction;
+import bdi4jade.belief.Belief;
+
+/**
+ * This is an abstract implementation of a belief goal.
+ * 
+ * @author Ingrid Nunes
+ */
+public abstract class AbstractBeliefGoal<K> implements BeliefGoal<K> {
+
+	private static final long serialVersionUID = 2493877854717226283L;
+
+	protected K beliefName;
+	protected Belief<K, ?> outputBelief;
+
+	/**
+	 * Default constructor.
+	 */
+	public AbstractBeliefGoal() {
+
+	}
+
+	/**
+	 * Creates a new AbstractBeliefGoal with the provided belief.
+	 * 
+	 * @param beliefName
+	 *            the belief name.
+	 */
+	public AbstractBeliefGoal(K beliefName) {
+		this.beliefName = beliefName;
+	}
+
+	/**
+	 * @see java.lang.Object#equals(java.lang.Object)
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if (obj instanceof AbstractBeliefGoal) {
+			AbstractBeliefGoal<?> bg = (AbstractBeliefGoal<?>) obj;
+			return beliefName.equals(bg.beliefName);
+		}
+		return false;
+	}
+
+	/**
+	 * Returns the name of the belief associated with this goal.
+	 * 
+	 * @return the belief name.
+	 */
+	@Parameter(direction = Direction.IN)
+	public K getBeliefName() {
+		return beliefName;
+	}
+
+	/**
+	 * Returns the belief which is the output of this goal achievement.
+	 * 
+	 * @return the belief.
+	 */
+	@Override
+	@Parameter(direction = Direction.OUT)
+	public Belief<K, ?> getOutputBelief() {
+		return outputBelief;
+	}
+
+	/**
+	 * @see java.lang.Object#hashCode()
+	 */
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = AbstractBeliefGoal.class.hashCode();
+		result = prime * result
+				+ ((beliefName == null) ? 0 : beliefName.hashCode());
+		return result;
+	}
+
+	/**
+	 * Sets the name of the belief associated with this goal.
+	 * 
+	 * @param beliefName
+	 *            the belief name.
+	 */
+	public void setBeliefName(K beliefName) {
+		this.beliefName = beliefName;
+	}
+
+	/**
+	 * Sets the belief which is the output of this goal achievement.
+	 * 
+	 * @return the belief.
+	 */
+	@Override
+	public void setOutputBelief(Belief<K, ?> belief) {
+		this.outputBelief = belief;
+	}
+
+}