/*
 * 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
 *
 *      https://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 net.hasor.web;
import javax.servlet.ServletOutputStream;
import javax.servlet.WriteListener;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Delegating implementation of {@link javax.servlet.ServletOutputStream}.
 * @author Juergen Hoeller
 * @since 1.0.2
 */
public class DelegatingServletOutputStream extends ServletOutputStream {
    private final OutputStream targetStream;

    /**
     * Create a DelegatingServletOutputStream for the given target stream.
     * @param targetStream the target stream (never {@code null})
     */
    public DelegatingServletOutputStream(OutputStream targetStream) {
        this.targetStream = targetStream;
    }

    /**
     * Return the underlying target stream (never {@code null}).
     */
    public final OutputStream getTargetStream() {
        return this.targetStream;
    }

    @Override
    public void write(int b) throws IOException {
        this.targetStream.write(b);
    }

    @Override
    public void flush() throws IOException {
        super.flush();
        this.targetStream.flush();
    }

    @Override
    public void close() throws IOException {
        super.close();
        this.targetStream.close();
    }

    @Override
    public boolean isReady() {
        return true;
    }

    @Override
    public void setWriteListener(WriteListener writeListener) {
        throw new UnsupportedOperationException();
    }
}
