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    1   package org.slf4j.impl;
    2
    3   import java.io.PrintStream;
    4
    5   /**
    6    * This class encapsulates the user's choice of output target.
    7    *
    8    * @author Ceki G&uuml;lc&uuml;
    9    *
    10   */
    11  class OutputChoice {
    12
    13      enum OutputChoiceType {
    14          SYS_OUT, CACHED_SYS_OUT, SYS_ERR, CACHED_SYS_ERR, FILE;
    15      }
    16
    17      final OutputChoiceType outputChoiceType;
    18      final PrintStream targetPrintStream;
    19
    20      OutputChoice(OutputChoiceType outputChoiceType) {
    21          if (outputChoiceType == OutputChoiceType.FILE) {
    22              throw new IllegalArgumentException();
    23          }
    24          this.outputChoiceType = outputChoiceType;
    25          if (outputChoiceType == OutputChoiceType.CACHED_SYS_OUT) {
    26              this.targetPrintStream = System.out;
    27          } else if (outputChoiceType == OutputChoiceType.CACHED_SYS_ERR) {
    28              this.targetPrintStream = System.err;
    29          } else {
    30              this.targetPrintStream = null;
    31          }
    32      }
    33
    34      OutputChoice(PrintStream printStream) {
    35          this.outputChoiceType = OutputChoiceType.FILE;
    36          this.targetPrintStream = printStream;
    37      }
    38
    39      PrintStream getTargetPrintStream() {
    40          switch (outputChoiceType) {
    41          case SYS_OUT:
    42              return System.out;
    43          case SYS_ERR:
    44              return System.err;
    45          case CACHED_SYS_ERR:
    46          case CACHED_SYS_OUT:
    47          case FILE:
    48              return targetPrintStream;
    49          default:
    50              throw new IllegalArgumentException();
    51          }
    52
    53      }
    54
    55  }