MavenOutputStream.java

/*
 *    Copyright 2010-2024 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 org.mybatis.maven.mvnmigrate.util;

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

import org.apache.maven.plugin.logging.Log;

/**
 * A custom {@link OutputStream}.
 * <p>
 * Writes all complete line (ended with \n character) to a maven logger.
 */
public class MavenOutputStream extends OutputStream {

  /**
   * The new line '\n' char constant.
   */
  private static final char NEW_LINE = '\n';

  /**
   * The buffer used to maintain the line.
   */
  private final StringBuilder buff = new StringBuilder();

  /**
   * The maven {@link Log}.
   */
  private final Log log;

  /**
   * Creates a new instance of {@link MavenOutputStream}.
   *
   * @param log
   *          the maven logger L
   */
  public MavenOutputStream(final Log log) {
    this.log = log;
  }

  @Override
  public void write(byte[] b, int off, int len) throws IOException {
    for (int i = off; i < len; i++) {
      write(b[i]);
    }
  }

  @Override
  public void write(byte[] b) throws IOException {
    write(b, 0, b.length);
  }

  @Override
  public void write(int data) throws IOException {
    if (NEW_LINE == data) {
      if (this.log.isInfoEnabled()) {
        this.log.info(buff.toString());
      }
      flush();
    } else {
      this.buff.append((char) data);
    }
  }

  @Override
  public void flush() throws IOException {
    super.flush();
    this.buff.delete(0, this.buff.capacity());
  }

}