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diff --git a/src/main/java/org/unitConverter/converterGUI/MutablePredicate.java b/src/main/java/org/unitConverter/converterGUI/MutablePredicate.java
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+++ b/src/main/java/org/unitConverter/converterGUI/MutablePredicate.java
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+/**
+ * Copyright (C) 2019 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.util.function.Predicate;
+
+/**
+ * A container for a predicate, which can be changed later.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-04-13
+ * @since v0.2.0
+ */
+final class MutablePredicate<T> implements Predicate<T> {
+	/**
+	 * The predicate stored in this {@code MutablePredicate}
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private Predicate<T> predicate;
+
+	/**
+	 * Creates the {@code MutablePredicate}.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public MutablePredicate(final Predicate<T> predicate) {
+		this.predicate = predicate;
+	}
+
+	/**
+	 * @return predicate
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public final Predicate<T> getPredicate() {
+		return this.predicate;
+	}
+
+	/**
+	 * @param predicate
+	 *            new value of predicate
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public final void setPredicate(final Predicate<T> predicate) {
+		this.predicate = predicate;
+	}
+
+	@Override
+	public boolean test(final T t) {
+		return this.predicate.test(t);
+	}
+}