From e8d6c3f71e9fc8d3d58e7d0e7cacbdd5c9737753 Mon Sep 17 00:00:00 2001
From: pjain <pjain@ae88bc3d-4319-0410-8dbf-d08b4c9d3795>
Date: Tue, 12 Nov 1996 00:51:48 +0000
Subject: image files source files

---
 java/src/GetOpt.java | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 java/src/GetOpt.java

(limited to 'java/src/GetOpt.java')

diff --git a/java/src/GetOpt.java b/java/src/GetOpt.java
new file mode 100644
index 00000000000..5060d7f8b94
--- /dev/null
+++ b/java/src/GetOpt.java
@@ -0,0 +1,150 @@
+/*************************************************
+ *
+ * = PACKAGE
+ *    ACE.Misc
+ *
+ * = FILENAME
+ *    GetOpt.java
+ *
+ *@author Prashant Jain
+ *
+ *************************************************/
+package ACE.Misc;
+
+import java.io.*;
+import java.util.Hashtable;
+import java.util.StringTokenizer;
+
+/**
+ * <hr>
+ * <h2>SYNOPSIS</h2>
+ *<blockquote>
+ *     Iterator for parsing command-line arguments.
+ *</blockquote>
+ *
+ * <h2>DESCRIPTION</h2>
+ *<blockquote>
+ *     This version of `get_opt' appears to the caller like standard
+ *     Unix `get_opt' but it behaves differently for the user, since
+ *     it allows the user to intersperse the options with the other
+ *     arguments.
+ * 
+ * <p> As `get_opt' works, it permutes the elements of `argv' so that,
+ *     when it is done, all the options precede everything else. Thus
+ *     all application programs are extended to handle flexible argument
+ *     order.
+ *</blockquote>
+ *
+ */
+public class GetOpt
+{
+  /** 
+   * Constructor
+   *@param args command line arguments
+   *@param optstring string containing the legitimate option
+   * characters. A colon in optstring means that the previous character
+   * is an option that wants an argument which is then taken from the
+   * rest of the current args-element. Here is an example of what
+   * optstring might look like: "c:dP:p".
+   */
+  public GetOpt (String[] args, String optstring)
+  {
+    // Cache the arguments
+    this.args_ = args;
+    this.hasArg_ = false;
+
+    // Build the arg hashtable
+    this.buildArgTable (optstring);
+  }
+  
+  /** 
+   * Scan elements specified in optstring for next option flag.
+   *@return The character corresponding to the next flag.
+   */
+  public int next ()
+  {
+    if (this.args_ == null)
+      return -1;
+
+    if (this.index_ < this.args_.length) 
+      {
+	String arg = this.args_[this.index_++];
+
+	// Make sure flag starts with "-"
+	if (!arg.startsWith ("-"))
+	  return -1;
+	
+	// Check if there is more than one character specified as flag
+	if (arg.length () > 2)
+	  return -1;
+	
+	// So far so good
+	// Check if the flag is in the arg_table and if it is get the
+	// associated binding.
+	Character c = (Character) this.argTable_.get (new Character (arg.charAt (1)));
+	if (c == null)
+	  return -1;
+
+	if (c.charValue () == '#')
+	  {
+	    this.hasArg_ = false;
+	    return arg.charAt (1);
+	  }
+	else if (c.charValue () == ':')
+	  {
+	    this.hasArg_ = true;
+	    return arg.charAt (1);
+	  }
+	else   // This should not happen
+	  return -1; 
+      }
+    return -1;
+  }
+  
+  /**
+   * Get the argument (if any) associated with the flag.
+   *@return the argument associated with the flag.
+   */
+  public String optarg ()
+  {
+    if (this.hasArg_)
+      return this.args_[this.index_++];
+    else
+      return null;
+  }
+  
+  // Build the argument table
+  private void buildArgTable (String s)
+  {
+    this.argTable_ = new Hashtable ();
+    StringTokenizer tokens = new StringTokenizer (s, ":");
+    while (tokens.hasMoreTokens ())
+      {
+	// Get the next token
+	String t = tokens.nextToken ();
+
+	// First add all flags except the one with ":" after it
+	// Note "#" is an arbitrary character we use to distinguish
+	// the two cases
+	for (int i = 0; i < t.length () - 1; i++)
+	  this.argTable_.put (new Character (t.charAt (i)),
+			       new Character ('#'));
+
+	// Now Add the flag just before ":" to the arg_table
+	this.argTable_.put (new Character (t.charAt (t.length () - 1)),
+			     new Character (':'));
+      }
+  }
+  
+  private String [] args_;
+  // Copy of the args passed in
+  
+  private boolean hasArg_;
+  // Indicator that the flag has an argument following it
+
+  private int index_;
+  // Index into the array of arguments
+
+  private Hashtable argTable_;
+  // Table of flags that take arguments after them
+}
-- 
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