Add IOBiConsumer.

Author: Gary Gregory

src/changes/changes.xml

@@ -284,6 +284,9 @@ The <action> type attribute can be add,update,fix,remove.
       <action dev="ggregory" type="add" due-to="Gary Gregory">
         Add IOExceptionList.checkEmpty(List, Object).
       </action>
+      <action dev="ggregory" type="add" due-to="Gary Gregory">
+        Add IOBiConsumer.
+      </action>
       <!-- UPDATE -->
       <action dev="ggregory" type="add" due-to="Gary Gregory">
         Update FileEntry to use FileTime instead of long for file time stamps.

src/main/java/org/apache/commons/io/function/IOBiConsumer.java

@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.io.function;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+/**
+ * Like {@link BiConsumer} but throws {@link IOException}.
+ *
+ * @param <T> the type of the first argument to the operation
+ * @param <U> the type of the second argument to the operation
+ *
+ * @see BiConsumer
+ * @since 1.8
+ */
+@FunctionalInterface
+public interface IOBiConsumer<T, U> {
+
+    /**
+     * Performs this operation on the given arguments.
+     *
+     * @param t the first input argument
+     * @param u the second input argument
+     * @throws IOException if an I/O error occurs.
+     */
+    void accept(T t, U u) throws IOException;
+
+    /**
+     * Returns a composed {@code BiConsumer} that performs, in sequence, this operation followed by the {@code after}
+     * operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation.
+     * If performing this operation throws an exception, the {@code after} operation will not be performed.
+     *
+     * @param after the operation to perform after this operation
+     * @return a composed {@code BiConsumer} that performs in sequence this operation followed by the {@code after}
+     *         operation
+     * @throws NullPointerException if {@code after} is null
+     */
+    default IOBiConsumer<T, U> andThen(IOBiConsumer<? super T, ? super U> after) {
+        Objects.requireNonNull(after);
+
+        return (l, r) -> {
+            accept(l, r);
+            after.accept(l, r);
+        };
+    }
+}

src/test/java/org/apache/commons/io/function/IOBiConsumerTest.java

@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.io.function;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests {@link IOBiConsumer}.
+ */
+public class IOBiConsumerTest {
+
+    @Test
+    public void testAccept() throws IOException {
+        final AtomicReference<String> ref = new AtomicReference<>();
+        final IOBiConsumer<String, Integer> biConsumer = (s, i) -> ref.set(s + i);
+        biConsumer.accept("A", 1);
+        assertEquals("A1", ref.get());
+    }
+
+    @Test
+    public void testAndThen() throws IOException {
+        final AtomicReference<String> ref = new AtomicReference<>();
+        final IOBiConsumer<String, Integer> biConsumer1 = (s, i) -> ref.set(s + i);
+        final IOBiConsumer<String, Integer> biConsumer2 = (s, i) -> ref.set(ref.get() + i + s);
+        biConsumer1.andThen(biConsumer2).accept("B", 2);
+        assertEquals("B22B", ref.get());
+    }
+}