zliberror.java

Java实现的各种数学算法

// zliberror.java
// modified
// feb01 scruff

package zlib;

import java.io.*;

final public class zliberror 
{
  public static boolean _strictassert = true;

  /**
	  JOptionPane.showMessageDialog(_f,
					"error: something bad...",
					"alert", JOptionPane.ERROR_MESSAGE);
  **/

  // improve...
  public static final void _assert(boolean b)
  {
    if (!b) {
      System.out.flush();
      // TODO: may want to throw exception instead so app can trap it
      Error ex = new Error("assert failed");
      if (_strictassert) {
	System.err.println("assert failed");
	ex.printStackTrace();
	System.exit(1);
      }
      else
	throw ex;
    }
  } //_assert


  public static final void _assert(boolean b, String msg)
  {
    if (!b) {
      System.out.flush();
      // TODO: may want to throw exception instead so app can trap it
      Error ex = new Error("assert failed: "+msg);
      if (_strictassert) {
	System.err.println("assert failed: "+msg);
	ex.printStackTrace();
	System.exit(1);
      }
      else
	throw ex;
    }
  } //_assert



  /**
   * @deprecated

  public static final void assert(boolean b)
  {
    if (!b) {
      System.out.flush();
      // TODO: may want to throw exception instead so app can trap it
      Error ex = new Error("assert failed");
      if (_strictassert) {
	System.err.println("assert failed");
	ex.printStackTrace();
	System.exit(1);
      }
      else
	throw ex;
    }
  } //assert
  */

  /**
   * @deprecated
  public static void assert(boolean b, String msg)
  {
    if (!b) {
      System.out.flush();
      // TODO: may want to throw exception instead so app can trap it
      Error ex = new Error("assert failed: "+msg);
      if (_strictassert) {
	System.err.println("assert failed: "+msg);
	ex.printStackTrace();
	System.exit(1);
      }
      else
	throw ex;
    }
  } //assert
  */

  /**
   */
  public static void printStackTrace(String msg)
  {
    Error ex = new Error(msg);
    System.err.println(msg);
    ex.printStackTrace();
  }


  /**
   * assertion fails, but just give a warning
   * (useful in debugging sometimes)
   */
  public static void warn(boolean b, String msg)
  {
    if (!b) {
      System.out.flush();
      // TODO: may want to throw exception instead so app can trap it
      Error ex = new Error("ASSERT WARNING: "+msg);
      ex.printStackTrace();
      System.err.println(ex);
    }
  } //warn


  public static void error(String s)
  {
    System.out.flush();
    Error ex = new Error(s);
    System.err.println("ERROR: " + s);
    // throw ex;
    ex.printStackTrace();
    System.exit(1);
  }

  public static void warning(String s)
  {
    // print on out rather than err because printing on
    // err puts it in the wrong place
    System.out.println("WARNING " + s);
  }

  /**
   * this is for a user error so do not print stack
   */
  public static void quit(int code, String msg)
  {
    System.err.println(msg);
    System.exit(code);
  }

  /**
   * print exception, stacktrace, quit
   */
  public static void die(Exception x)
  {
    System.out.flush();
    x.printStackTrace();
    System.out.flush();
    System.err.println(x);
    System.exit(1);
  } //die
  
  /**
   * assemble and throw a nicely formatted message
   * indicating where the StreamTokenizer is located.
   */
  public static void parseError(StreamTokenizer st, String path)
    throws IOException
  {
    String errmsg = "error parsing "+path+", line " + st.lineno();
    switch(st.ttype) {
    case StreamTokenizer.TT_WORD:
      errmsg += " near token " + st.sval;
      break;
    case StreamTokenizer.TT_NUMBER:
      errmsg += " near token " + st.nval;
      break;
    case StreamTokenizer.TT_EOL:
      errmsg += " near end of line";
      break;
    case StreamTokenizer.TT_EOF:
      errmsg += " near eof";
      break;
    }

    throw new IOException(errmsg);
  } //parseError

} //class zlib