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	/*
	* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This source code is provided to illustrate the usage of a given feature
	* or technique and has been deliberately simplified. Additional steps
	* required for a production-quality application, such as security checks,
	* input validation and proper error handling, might not be present in
	* this sample code.
	*/


	package com.sun.tools.example.debug.tty;

	import com.sun.jdi.*;
	import com.sun.jdi.request.EventRequest;
	import com.sun.jdi.request.ExceptionRequest;
	import com.sun.jdi.request.ClassPrepareRequest;
	import com.sun.jdi.event.ClassPrepareEvent;
	import java.util.ArrayList;

	abstract class EventRequestSpec {

	final ReferenceTypeSpec refSpec;

	int suspendPolicy = EventRequest.SUSPEND_ALL;

	EventRequest resolved = null;
	ClassPrepareRequest prepareRequest = null;

	EventRequestSpec(ReferenceTypeSpec refSpec) {
	this.refSpec = refSpec;
	}

	/**
	* The 'refType' is known to match, return the EventRequest.
	*/
	abstract EventRequest resolveEventRequest(ReferenceType refType)
	throws Exception;

	/**
	* @return If this EventRequestSpec matches the 'refType'
	* return the cooresponding EventRequest. Otherwise
	* return null.
	*/
	synchronized EventRequest resolve(ClassPrepareEvent event) throws Exception {
	if ((resolved == null) &&
	(prepareRequest != null) &&
	prepareRequest.equals(event.request())) {

	resolved = resolveEventRequest(event.referenceType());
	prepareRequest.disable();
	Env.vm().eventRequestManager().deleteEventRequest(prepareRequest);
	prepareRequest = null;

	if (refSpec instanceof PatternReferenceTypeSpec) {
	PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
	if (! prs.isUnique()){
	/*
	* Class pattern event requests are never
	* considered "resolved", since future class loads
	* might also match.
	* Create and enable a new ClassPrepareRequest to
	* keep trying to resolve.
	*/
	resolved = null;
	prepareRequest = refSpec.createPrepareRequest();
	prepareRequest.enable();
	}
	}
	}
	return resolved;
	}

	synchronized void remove() {
	if (isResolved()) {
	Env.vm().eventRequestManager().deleteEventRequest(resolved());
	}
	if (refSpec instanceof PatternReferenceTypeSpec) {
	PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
	if (! prs.isUnique()){
	/*
	* This is a class pattern. Track down and delete
	* all EventRequests matching this spec.
	* Note: Class patterns apply only to ExceptionRequests,
	* so that is all we need to examine.
	*/
	ArrayList<ExceptionRequest> deleteList = new ArrayList<ExceptionRequest>();
	for (ExceptionRequest er :
	Env.vm().eventRequestManager().exceptionRequests()) {
	if (prs.matches(er.exception())) {
	deleteList.add (er);
	}
	}
	Env.vm().eventRequestManager().deleteEventRequests(deleteList);
	}
	}
	}

	private EventRequest resolveAgainstPreparedClasses() throws Exception {
	for (ReferenceType refType : Env.vm().allClasses()) {
	if (refType.isPrepared() && refSpec.matches(refType)) {
	resolved = resolveEventRequest(refType);
	}
	}
	return resolved;
	}

	synchronized EventRequest resolveEagerly() throws Exception {
	try {
	if (resolved == null) {
	/*
	* Not resolved. Schedule a prepare request so we
	* can resolve later.
	*/
	prepareRequest = refSpec.createPrepareRequest();
	prepareRequest.enable();

	// Try to resolve in case the class is already loaded.
	resolveAgainstPreparedClasses();
	if (resolved != null) {
	prepareRequest.disable();
	Env.vm().eventRequestManager().deleteEventRequest(prepareRequest);
	prepareRequest = null;
	}
	}
	if (refSpec instanceof PatternReferenceTypeSpec) {
	PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
	if (! prs.isUnique()){
	/*
	* Class pattern event requests are never
	* considered "resolved", since future class loads
	* might also match. Create a new
	* ClassPrepareRequest if necessary and keep
	* trying to resolve.
	*/
	resolved = null;
	if (prepareRequest == null) {
	prepareRequest = refSpec.createPrepareRequest();
	prepareRequest.enable();
	}
	}
	}
	} catch (VMNotConnectedException e) {
	// Do nothing. Another resolve will be attempted when the
	// VM is started.
	}
	return resolved;
	}

	/**
	* @return the eventRequest this spec has been resolved to,
	* null if so far unresolved.
	*/
	EventRequest resolved() {
	return resolved;
	}

	/**
	* @return true if this spec has been resolved.
	*/
	boolean isResolved() {
	return resolved != null;
	}

	protected boolean isJavaIdentifier(String s) {
	if (s.length() == 0) {
	return false;
	}

	int cp = s.codePointAt(0);
	if (! Character.isJavaIdentifierStart(cp)) {
	return false;
	}

	for (int i = Character.charCount(cp); i < s.length(); i += Character.charCount(cp)) {
	cp = s.codePointAt(i);
	if (! Character.isJavaIdentifierPart(cp)) {
	return false;
	}
	}

	return true;
	}

	String errorMessageFor(Exception e) {
	if (e instanceof IllegalArgumentException) {
	return (MessageOutput.format("Invalid command syntax"));
	} else if (e instanceof RuntimeException) {
	// A runtime exception that we were not expecting
	throw (RuntimeException)e;
	} else {
	return (MessageOutput.format("Internal error; unable to set",
	this.refSpec.toString()));
	}
	}
	}

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