Agregado informe que muestra los egresos de facturas materia prima

src/danielcortes/xyz/utils/Pair.java

@@ -0,0 +1,59 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2018-2019 Daniel Cortes
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package danielcortes.xyz.utils;
+
+import java.util.Objects;
+
+public class Pair<L,R> {
+    private final L left;
+    private final R right;
+
+    public Pair(L left, R right) {
+        this.left = left;
+        this.right = right;
+    }
+
+    public L getLeft() { return left; }
+    public R getRight() { return right; }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        return left.equals(pair.left) &&
+                right.equals(pair.right);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(left, right);
+    }
+
+    @Override
+    public String toString() {
+        return "{left=" + left + ", right=" + right + "}";
+    }
+}