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With inspiration from other libraries

There is a newer version: 2.12.15

package org.mvel2.templates.util.io;

import org.mvel2.templates.util.TemplateOutputStream;

public class StringBuilderStream implements TemplateOutputStream {
  private StringBuilder appender;

  public StringBuilderStream(StringBuilder appender) {
    this.appender = appender;
  }

  public TemplateOutputStream append(CharSequence c) {
    appender.append(c);
    return this;
  }

  public TemplateOutputStream append(char[] c) {
    appender.append(c);
    return this;
  }

  @Override
  public String toString() {
    return appender.toString();
  }
}