org.jboss.marshalling.AbstractObjectInput Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.marshalling;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInput;
/**
* An abstract object input implementation.
*/
public abstract class AbstractObjectInput extends SimpleDataInput implements ObjectInput {
/**
* Construct a new instance.
*
* @param bufferSize the buffer size to use
*/
protected AbstractObjectInput(int bufferSize) {
super(bufferSize);
}
/** {@inheritDoc} */
public final Object readObject() throws ClassNotFoundException, IOException {
return doReadObject(false);
}
/**
* Read and return an unshared object.
*
* @return an unshared object
* @throws ClassNotFoundException if the class of a serialized object cannot be found
* @throws IOException if an error occurs
*/
public final Object readObjectUnshared() throws ClassNotFoundException, IOException {
return doReadObject(true);
}
/**
* Implementation of the actual object-reading method.
*
* @param unshared {@code true} if the instance should be unshared, {@code false} if it is shared
* @return the object to read
* @throws ClassNotFoundException if the class for the object could not be loaded
* @throws IOException if an I/O error occurs
*/
protected abstract Object doReadObject(boolean unshared) throws ClassNotFoundException, IOException;
/**
* Read and return an object, cast to a specific type.
*
* @param type the object class
* @param the object type
* @return the object read from the stream
* @throws ClassNotFoundException if the class of a serialized object cannot be found
* @throws InvalidObjectException if the object is not of the expected type
* @throws IOException if an error occurs
*/
public T readObject(final Class type) throws ClassNotFoundException, IOException {
final Object obj = doReadObject(false);
try {
return type.cast(obj);
} catch (ClassCastException e) {
throw wrongType(e, type, obj.getClass());
}
}
/**
* Read and return an unshared object, cast to a specific type.
*
* @param type the object class
* @param the object type
* @return an unshared object
* @throws ClassNotFoundException if the class of a serialized object cannot be found
* @throws InvalidObjectException if the object is not of the expected type
* @throws IOException if an error occurs
*/
public T readObjectUnshared(final Class type) throws ClassNotFoundException, IOException {
final Object obj = doReadObject(true);
try {
return type.cast(obj);
} catch (ClassCastException e) {
throw wrongType(e, type, obj.getClass());
}
}
private static InvalidObjectException wrongType(final ClassCastException e, final Class expected, final Class actual) {
final InvalidObjectException ioe = new InvalidObjectException("Object is of the wrong type (expected " + expected + ", got " + actual + ")");
ioe.initCause(e);
return ioe;
}
}