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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.core.infrastructure.java.compile.singleclass;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import javax.tools.SimpleJavaFileObject;
/**
* The Class SingleClassByteCodeFileObject is a specialization of the {@link SimpleJavaFileObject} class, which is
* itself an implementation of the {@code JavaFileObject} interface, which provides a file abstraction for tools
* operating on Java programming language source and class files. The {@link SimpleJavaFileObject} class provides simple
* implementations for most methods in {@code JavaFileObject}. This class is designed to be sub classed and used as a
* basis for {@code JavaFileObject} implementations. Subclasses can override the implementation and specification of any
* method of this class as long as the general contract of {@code JavaFileObject} is obeyed.
*
* <p>This class holds the byte code for a single class in memory.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class SingleClassByteCodeFileObject extends SimpleJavaFileObject {
// The ByteArrayOutputStream holds the byte code for the class
private ByteArrayOutputStream byteArrayOutputStream;
/**
* Instantiates the byte code for the class in memory.
*
* @param className the class name is used to compose a URI for the class
*/
public SingleClassByteCodeFileObject(final String className) {
super(URI.create("byte:///" + className + ".class"), Kind.CLASS);
}
/**
* {@inheritDoc}.
*/
@Override
public OutputStream openOutputStream() {
// Create the byte array output stream that will hold the byte code for the class, when the class source code is
// compiled, this output stream is passed
// to the compiler and the byte code for the class is written into the output stream.
byteArrayOutputStream = new ByteArrayOutputStream();
return byteArrayOutputStream;
}
/**
* {@inheritDoc}.
*/
@Override
public InputStream openInputStream() {
// No input stream for streaming out the byte code
return null;
}
/**
* Gets the byte code of the class.
*
* @return the byte code of the class
*/
public byte[] getByteCode() {
return byteArrayOutputStream.toByteArray();
}
}
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