SPR-7627 added Serializer and Deserializer strategies, Converter adapters, and default implementations

org.springframework.core/src/main/java/org/springframework/core/serializer/DefaultDeserializer.java

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+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+
+/**
+ * Deserializer that reads an input stream using Java Serialization.
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public class DefaultDeserializer implements Deserializer<Object> { 
+
+	/**
+	 * Reads the input stream and deserializes into an object. 
+	 */
+	public Object deserialize(InputStream inputStream) throws IOException {
+		ObjectInputStream objectInputStream = null;
+		try {
+			objectInputStream = new ObjectInputStream(inputStream);
+			return objectInputStream.readObject();
+		}
+		catch (ClassNotFoundException e) {
+			if (objectInputStream != null) {
+				objectInputStream.close();
+			}
+			throw new IOException(e.getMessage());
+		}
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/DefaultSerializer.java

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+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.OutputStream;
+import java.io.Serializable;
+
+import org.springframework.util.Assert;
+
+/**
+ * Serializer that writes an object to an output stream using Java Serialization.
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public class DefaultSerializer implements Serializer<Object> {
+
+	/**
+	 * Writes the source object to an output stream using Java Serialization.
+	 * Source object must implement {@link Serializable}.
+	 */
+	public void serialize(Object object, OutputStream outputStream) throws IOException {
+		Assert.isTrue(object instanceof Serializable, this.getClass().getName()
+				+ " requires a Serializable payload, but received [" + object.getClass().getName() + "]");
+		ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
+		objectOutputStream.writeObject(object);
+		objectOutputStream.flush();
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/DeserializationFailureException.java

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+/*
+ * Copyright 2002-2010 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.serializer;
+
+/**
+ * Exception to be thrown when a failure occurs while deserializing an object.
+ * 
+ * @author Gary Russell
+ * @since 3.0.5
+ */
+@SuppressWarnings("serial")
+public class DeserializationFailureException extends SerializationException {
+
+	/**
+	 * Construct a <code>DeserializationFailureException</code> with the specified detail message.
+	 * @param message the detail message
+	 */
+	public DeserializationFailureException(String message) {
+		super(message);
+	}
+
+	/**
+	 * Construct a <code>DeserializationFailureException</code> with the specified detail message
+	 * and nested exception.
+	 * @param message the detail message
+	 * @param cause the nested exception
+	 */
+	public DeserializationFailureException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/Deserializer.java

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+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A strategy interface for converting from data in an InputStream to an Object.
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public interface Deserializer<T> {
+
+	/**
+	 * Read (assemble an object of type T) from an InputStream.
+	 * @param inputStream The InputStream.
+	 * @return the deserialized object
+	 * @throws IOException in case of errors reading the stream
+	 */
+	public T deserialize(InputStream inputStream) throws IOException;
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/DeserializingConverter.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.Assert;
+
+/**
+ * A {@link Converter} that delegates to a {@link Deserializer} 
+ * to convert data in a byte array to an object.
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public class DeserializingConverter implements Converter<byte[], Object> {
+
+	private final Deserializer<Object> deserializer;
+
+
+	/**
+	 * Create a default DeserializingConverter that uses standard Java deserialization.
+	 */
+	public DeserializingConverter() {
+		this.deserializer = new DefaultDeserializer();
+	}
+
+	/**
+	 * Create a DeserializingConverter that delegates to the provided {@link Deserializer}
+	 */
+	public DeserializingConverter(Deserializer<Object> deserializer) {
+		Assert.notNull(deserializer, "deserializer must not be null");
+		this.deserializer = deserializer;
+	}
+
+
+	public Object convert(byte[] source) {
+		ByteArrayInputStream byteStream = new ByteArrayInputStream(source);
+		try {
+			return this.deserializer.deserialize(byteStream);
+		}
+		catch (Exception e) {
+			try {
+				byteStream.close();
+			}
+			catch (IOException e1) { /* ignore */ }
+			throw new DeserializationFailureException(
+					"Failed to deserialize payload. " +
+					"Is the byte array a result of corresponding serialization for " + 
+					this.deserializer.getClass().getName() + "?", e);
+		}
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/SerializationException.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+import org.springframework.core.NestedRuntimeException;
+
+/**
+ * Root exception for serialization and deserialization exceptions.
+ * 
+ * @author Gary Russell
+ * @since 3.0.5
+ */
+@SuppressWarnings("serial")
+public abstract class SerializationException extends NestedRuntimeException {
+
+	/**
+	 * Construct a <code>SerializationException</code> with the specified detail message.
+	 * @param message the detail message
+	 */
+	public SerializationException(String message) {
+		super(message);
+	}
+
+	/**
+	 * Construct a <code>SerializationException</code> with the specified detail message
+	 * and nested exception.
+	 * @param message the detail message
+	 * @param cause the nested exception
+	 */
+	public SerializationException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/SerializationFailureException.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+/**
+ * Exception to be thrown when a failure occurs while serializing an object.
+ * 
+ * @author Gary Russell
+ * @since 3.0.5
+ */
+@SuppressWarnings("serial")
+public class SerializationFailureException extends SerializationException {
+
+	/**
+	 * Construct a <code>SerializationFailureException</code> with the specified detail message.
+	 * @param message the detail message
+	 */
+	public SerializationFailureException(String message) {
+		super(message);
+	}
+
+	/**
+	 * Construct a <code>SerializationFailureException</code> with the specified detail message
+	 * and nested exception.
+	 * @param message the detail message
+	 * @param cause the nested exception
+	 */
+	public SerializationFailureException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/SerializationUtils.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+/**
+ * Static utility for serialization and deserialization.
+ * 
+ * @author Dave Syer
+ * @since 3.0.5
+ */
+public abstract class SerializationUtils {
+
+	/**
+	 * Serialize the object provided.
+	 * 
+	 * @param object the object to serialize
+	 * @return an array of bytes representing the object in a portable fashion
+	 */
+	public static byte[] serialize(Object object) {
+		if (object == null) {
+			return null;
+		}
+		ByteArrayOutputStream stream = new ByteArrayOutputStream();
+		try {
+			new ObjectOutputStream(stream).writeObject(object);
+		}
+		catch (IOException e) {
+			throw new IllegalArgumentException("failed to serialize object of type: " + object.getClass(), e);
+		}
+		return stream.toByteArray();
+	}
+
+	/**
+	 * Deserialize the byte array into an object.
+	 * 
+	 * @param bytes a serialized object
+	 * @return the result of deserializing the bytes
+	 */
+	public static Object deserialize(byte[] bytes) {
+		if (bytes == null) {
+			return null;
+		}
+		try {
+			return new ObjectInputStream(new ByteArrayInputStream(bytes)).readObject();
+		}
+		catch (IOException e) {
+			throw new IllegalArgumentException("failed to deserialize object", e);
+		}
+		catch (ClassNotFoundException e) {
+			throw new IllegalStateException("failed to deserialize object type", e);
+		}
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/Serializer.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * A strategy interface for streaming an object to an OutputStream.
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public interface Serializer<T> {
+
+	/**
+	 * Write an object of type T to the outputSream.
+	 * @param object The object.
+	 * @param outputStream the outputStream
+	 * @throws IOException in case of errors writing to the stream
+	 */
+	public void serialize(T object, OutputStream outputStream) throws IOException;
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/SerializingConverter.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2002-2010 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.serializer;
+
+import java.io.ByteArrayOutputStream;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.util.Assert;
+
+/**
+ * A {@Link Converter} that delegates to a {@link Serializer} to convert an object to a byte array. 
+ * 
+ * @author Gary Russell
+ * @author Mark Fisher
+ * @since 3.0.5
+ */
+public class SerializingConverter implements Converter<Object, byte[]> {
+
+	private final Serializer<Object> serializer; 
+
+
+	/**
+	 * Create a default SerializingConverter that uses standard Java serialization.
+	 */
+	public SerializingConverter() {
+		this.serializer = new DefaultSerializer();
+	}
+
+	/**
+	 * Create a SerializingConverter that delegates to the provided {@link Serializer}
+	 */
+	public SerializingConverter(Serializer<Object> serializer) {
+		Assert.notNull(serializer, "serializer must not be null");
+		this.serializer = serializer;
+	}
+
+
+	/**
+	 * Serializes the source object and returns the byte array result.
+	 */
+	public byte[] convert(Object source) {
+		ByteArrayOutputStream byteStream = new ByteArrayOutputStream(128);
+		try  {
+			this.serializer.serialize(source, byteStream);
+			return byteStream.toByteArray();
+		}
+		catch (Exception e) {
+			throw new SerializationFailureException("failed to serialize object", e);
+		}
+	}
+
+}

org.springframework.core/src/main/java/org/springframework/core/serializer/package-info.java

@@ -0,0 +1,6 @@
+/**
+ * Root package for Spring's serializer interfaces and implementations. 
+ * Provides an abstraction over various serialization techniques.
+ * Includes exceptions for serialization and deserialization failures.
+ */
+package org.springframework.core.serializer;