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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.io;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Delegates all operations to the original underlying OutputStream and a
 * mutable branch OutputStream.
 * 
 * @author Kirk Lund
 * @since 7.0
 */
public class TeeOutputStream extends FilterOutputStream {

  private volatile OutputStream branch;
  
  public TeeOutputStream(OutputStream out) {
    super(out);
  }
  
  public TeeOutputStream(OutputStream out, OutputStream branch) {
    this(out);
    this.branch = branch;
  }
  
  public OutputStream getOutputStream() {
    return super.out;
  }
  
  public OutputStream getBranchOutputStream() {
    return this.branch;
  }
  
  public void setBranchOutputStream(OutputStream branch) {
    if (branch == super.out) {
      throw new IllegalArgumentException("TeeOutputStream cannot set branch same as out");
    }
    this.branch = branch;
  }

  @Override
  public void write(int b) throws IOException {
    super.write(b);
    OutputStream os = this.branch;
    if (os != null) {
      os.write(b);
    }
  }

  @Override
  public void flush() throws IOException {
    super.flush();
    OutputStream os = this.branch;
    if (os != null) {
      os.flush();
    }
  }

  @Override
  public void close() throws IOException {
    super.close();
    OutputStream os = this.branch;
    if (os != null) {
      os.close();
    }
  }
  
  @Override
  public String toString() {
    final StringBuilder sb = new StringBuilder(getClass().getSimpleName());
    sb.append("@").append(System.identityHashCode(this)).append("{");
    sb.append("outputStream=").append(super.out);
    sb.append(", branchOutputStream=").append(this.branch);
    return sb.append("}").toString();
  }
}