Add byte[] encoder and decoder

This commit adds a ByteArrayDecoder and ByteArrayEncoder.

spring-core/src/test/java/org/springframework/core/codec/ByteArrayDecoderTests.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed 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.springframework.core.codec;
+
+import java.util.Collections;
+
+import org.junit.Test;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.AbstractDataBufferAllocatingTestCase;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.tests.TestSubscriber;
+import org.springframework.util.MimeTypeUtils;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class ByteArrayDecoderTests extends AbstractDataBufferAllocatingTestCase {
+
+	private final ByteArrayDecoder decoder = new ByteArrayDecoder();
+
+	@Test
+	public void canDecode() {
+		assertTrue(this.decoder.canDecode(ResolvableType.forClass(byte[].class),
+				MimeTypeUtils.TEXT_PLAIN));
+		assertFalse(this.decoder.canDecode(ResolvableType.forClass(Integer.class),
+				MimeTypeUtils.TEXT_PLAIN));
+		assertTrue(this.decoder.canDecode(ResolvableType.forClass(byte[].class),
+				MimeTypeUtils.APPLICATION_JSON));
+	}
+
+	@Test
+	public void decode() {
+		DataBuffer fooBuffer = stringBuffer("foo");
+		DataBuffer barBuffer = stringBuffer("bar");
+		Flux<DataBuffer> source = Flux.just(fooBuffer, barBuffer);
+		Flux<byte[]> output = this.decoder.decode(source,
+				ResolvableType.forClassWithGenerics(Publisher.class, byte[].class),
+				null, Collections.emptyMap());
+		TestSubscriber
+				.subscribe(output)
+				.assertNoError()
+				.assertComplete()
+				.assertValuesWith(bytes -> assertArrayEquals("foo".getBytes(), bytes),
+						bytes -> assertArrayEquals("bar".getBytes(), bytes));
+	}
+
+}

spring-core/src/test/java/org/springframework/core/codec/ByteArrayEncoderTests.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed 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.springframework.core.codec;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.AbstractDataBufferAllocatingTestCase;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.tests.TestSubscriber;
+import org.springframework.util.MimeTypeUtils;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class ByteArrayEncoderTests extends AbstractDataBufferAllocatingTestCase {
+
+	private ByteArrayEncoder encoder;
+
+	@Before
+	public void createEncoder() {
+		this.encoder = new ByteArrayEncoder();
+	}
+
+	@Test
+	public void canEncode() {
+		assertTrue(this.encoder.canEncode(ResolvableType.forClass(byte[].class),
+				MimeTypeUtils.TEXT_PLAIN));
+		assertFalse(this.encoder.canEncode(ResolvableType.forClass(Integer.class),
+				MimeTypeUtils.TEXT_PLAIN));
+		assertTrue(this.encoder.canEncode(ResolvableType.forClass(byte[].class),
+				MimeTypeUtils.APPLICATION_JSON));
+	}
+
+	@Test
+	public void encode() {
+		byte[] fooBytes = "foo".getBytes(StandardCharsets.UTF_8);
+		byte[] barBytes = "bar".getBytes(StandardCharsets.UTF_8);
+		Flux<byte[]> source = Flux.just(fooBytes, barBytes);
+
+		Flux<DataBuffer> output = this.encoder.encode(source, this.bufferFactory,
+				ResolvableType.forClassWithGenerics(Publisher.class, ByteBuffer.class),
+				null, Collections.emptyMap());
+		TestSubscriber
+				.subscribe(output)
+				.assertValuesWith(b -> {
+					byte[] buf = new byte[3];
+					b.read(buf);
+					assertArrayEquals(fooBytes, buf);
+				}, b -> {
+					byte[] buf = new byte[3];
+					b.read(buf);
+					assertArrayEquals(barBytes, buf);
+				});
+	}
+
+}