/*
 * Copyright (c) 2000, 2001    Paul Kinnucan
 *
 * $Revision: 1.1 $
 */

package jde.debugger.command;
import jde.debugger.JDEException;
import java.util.List;
import java.util.ArrayList;
import java.util.StringTokenizer;
import jde.debugger.spec.EventRequestSpec;
import jde.debugger.Etc;
import jde.debugger.spec.EventRequestSpecList;


/**
 * 'break' command.
 * <p>
 *
 * <b>Syntax:</b>
 * <pre>
 * break {@link #doBreakInMethod in_method} class method [(args)] 
 *      [{@link Etc#getThreadFromArgs(List) thread-restriction}]
 *      [{@link Etc#getExprFromArgs(List) expression-restriction}]
 *      [{@link Etc#getSuspendPolicyFromArgs(List) suspend-policy}]
 *     
 * break {@link #doBreakOnLine on_line}   class line
 *      [{@link Etc#getThreadFromArgs(List) thread-restriction}]
 *      [{@link Etc#getExprFromArgs(List) expression-restriction}]
 *      [{@link Etc#getSuspendPolicyFromArgs(List) suspend-policy}]
 *
 * break {@link #doBreakAbsolute absolute}  file line
 *      [{@link Etc#getThreadFromArgs(List) thread-restriction}]
 *      [{@link Etc#getExprFromArgs(List) expression-restriction}]
 *      [{@link Etc#getSuspendPolicyFromArgs(List) suspend-policy}]
 * </pre>
 *
 * <b>Returns:</b>
 * <pre>
 * (jde-dbo-command-result cmdID specID)
 * </pre>
 *
 * <b>Comments:</b>
 * <ul>
 * <li> There are exactly three kinds of 'break' commands. One 
 *	of in_method, on_line, or absolute need to be used.
 * <li> 'class' can be a string pattern of the type *.Test
 * <li> specID is a 'long', that can be used in 'clear' commands.
 * </ul>
 *
 * <p>
 * @see EventHandler#breakpointEvent(BreakpointEvent)
 *
 * @author Paul Kinnucan
 * @version $Revision: 1.1 $
 *
 */
public class Break extends DebugProcessCommand {
  
  /**
   *
   * @exception jde.debugger.JDEException <description>
   */
  public void doCommand() throws JDEException {
    try {
      // whatever function is called, should do a signalCommandResult
      // during the execution.
      String type = args.remove(0).toString().toLowerCase();
      if (type.equals("in_method")) {
	doBreakInMethod(args);
      } else if (type.equals("on_line")) {
	doBreakOnLine(args);
      } else if (type.equals("absolute")) {
	doBreakAbsolute(args);
      } else
	throw new JDEException("Syntax error: expecting one of 'in_method', 'on_line', or 'absolute'; '"+type+"' is not supported");
    } catch (UnsupportedOperationException ex) {
      throw new JDEException("Unspecified Error occured");
    } catch (IndexOutOfBoundsException ex) {
      throw new JDEException("Syntax error: argument missing");
    }
  }


    /**
     * A break in a particular method.
     * <p>
     *
     * <b>Syntax:</b>
     * <pre>
     * break in_method class method [(arg1,arg2,...)] 
     *      [{@link Etc#getThreadFromArgs(List) thread-restriction}]
     *      [{@link Etc#getExprFromArgs(List) expression-restriction}]
     *      [{@link Etc#getSuspendPolicyFromArgs(List) suspend-policy}]
     * </pre>
     *
     * <b>Comments:</b>
     * <ul>
     * <li> There should be <b>no spaces</b> before or after the ','; when 
     *      the arguments are supplied.
     * <li> A void method should be indicated by <code>()</code>
     * <li> A unique method doesn't need to supply the arguments. The
     * <b>entire</b> argument list should be absent in this case.
     * </ul>
     */
    public void doBreakInMethod(List args)
	throws JDEException {

	if (args.size() < 2)
	    throw new JDEException("Insufficient arguments");
	
	String classPattern = args.remove(0).toString();
	String method = args.remove(0).toString();

	// the argument list
	List argumentList = null;

	// see if more arguments are present
	if (args.size() > 0) {

	    String arg = args.remove(0).toString();

	    // see if any arglist was provided at all
	    if (arg.startsWith("(")) {
		// apparently it was. double check.
		if (!arg.endsWith(")")) {
		    throw new JDEException("The argument list seems to be corrupt");
		}
		// trim the parens
		arg = arg.substring(1, arg.length() - 1);
		argumentList = new ArrayList();
		StringTokenizer t = new StringTokenizer(arg, ",");
		while (t.hasMoreTokens()) {
		    argumentList.add(t.nextToken());
		}
	    }
	}
	EventRequestSpecList eventRequests = proc.getEventRequestSpecs();
	EventRequestSpec er = eventRequests.createMethodBreakpoint(classPattern, method, argumentList);
	er.setThread(Etc.getThreadFromArgs(args));
	er.setExpression(Etc.getExprFromArgs(args));
	er.setSuspendPolicy(Etc.getSuspendPolicyFromArgs(args));
	eventRequests.install(er);

	jde.signalCommandResult(procID, cmdID, er.getID());
    }

    /** A break on a particular line of a class */
    public void doBreakOnLine(List args)
	throws JDEException {

	if (args.size() < 2)
	    throw new JDEException("Insufficient arguments");
	
	String classPattern = args.remove(0).toString();
	int line = Etc.safeGetint(args.remove(0), "line number");

	EventRequestSpecList eventRequests = proc.getEventRequestSpecs();
	EventRequestSpec er =
	    eventRequests.createClassLineBreakpoint(classPattern, line);
	er.setThread(Etc.getThreadFromArgs(args));
	er.setExpression(Etc.getExprFromArgs(args));
	er.setSuspendPolicy(Etc.getSuspendPolicyFromArgs(args));
	eventRequests.install(er);
	    
	jde.signalCommandResult(procID, cmdID, er.getID());
    }

    /** A break on a line of a given source file */
    public void doBreakAbsolute(List args)
	throws JDEException {

	if (args.size() < 2)
	    throw new JDEException("Insufficient arguments");
	
	String file = args.remove(0).toString();
	int line = Etc.safeGetint(args.remove(0), "line number");

	EventRequestSpecList eventRequests = proc.getEventRequestSpecs();
	EventRequestSpec er =
	    eventRequests.createSourceLineBreakpoint(file, line);
	er.setThread(Etc.getThreadFromArgs(args));
	er.setExpression(Etc.getExprFromArgs(args));
	er.setSuspendPolicy(Etc.getSuspendPolicyFromArgs(args));
	eventRequests.install(er);
	    
	jde.signalCommandResult(procID, cmdID, er.getID());
    }

  public Object clone() {return new Break();}
  
} // Break

/*
 * $Log: Break.java,v $
 * Revision 1.1  2001/03/24 05:48:39  paulk
 * Initial version.
 *
 *
 */

// End of Break.java