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	/*
	* Copyright (c) 1999, 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.bdi;

	import com.sun.jdi.*;
	import com.sun.jdi.request.EventRequest;

	abstract public class EventRequestSpec {

	static final int STATUS_UNRESOLVED = 1;
	static final int STATUS_RESOLVED = 2;
	static final int STATUS_ERROR = 3;

	static final Object specPropertyKey = "spec";

	final EventRequestSpecList specs;
	final ReferenceTypeSpec refSpec;
	EventRequest request = null;

	int status = STATUS_UNRESOLVED;

	EventRequestSpec(EventRequestSpecList specs, ReferenceTypeSpec refSpec) {
	this.specs = specs;
	this.refSpec = refSpec;
	}

	void setRequest(EventRequest request) {
	this.request = request;
	request.putProperty(specPropertyKey, this);
	request.enable();
	}

	/**
	* The 'refType' is known to match.
	*/
	abstract void resolve(ReferenceType refType) throws Exception;

	abstract void notifySet(SpecListener listener, SpecEvent evt);
	abstract void notifyDeferred(SpecListener listener, SpecEvent evt);
	abstract void notifyResolved(SpecListener listener, SpecEvent evt);
	abstract void notifyDeleted(SpecListener listener, SpecEvent evt);
	abstract void notifyError(SpecListener listener, SpecErrorEvent evt);

	/**
	* The 'refType' is known to match.
	*/
	void resolveNotify(ReferenceType refType) {
	try {
	resolve(refType);
	status = STATUS_RESOLVED;
	specs.notifyResolved(this);
	} catch(Exception exc) {
	status = STATUS_ERROR;
	specs.notifyError(this, exc);
	}
	}

	/**
	* See if 'refType' matches and resolve.
	*/
	void attemptResolve(ReferenceType refType) {
	if (!isResolved() && refSpec.matches(refType)) {
	resolveNotify(refType);
	}
	}

	void attemptImmediateResolve(VirtualMachine vm) {
	// try to resolve immediately
	for (ReferenceType refType : vm.allClasses()) {
	if (refSpec.matches(refType)) {
	try {
	resolve(refType);
	status = STATUS_RESOLVED;
	specs.notifySet(this);
	} catch(Exception exc) {
	status = STATUS_ERROR;
	specs.notifyError(this, exc);
	}
	return;
	}
	}
	specs.notifyDeferred(this);
	}

	public EventRequest getEventRequest() {
	return request;
	}

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

	/**
	* @return true if this spec has not yet been resolved.
	*/
	public boolean isUnresolved() {
	return status == STATUS_UNRESOLVED;
	}

	/**
	* @return true if this spec is unresolvable due to error.
	*/
	public boolean isErroneous() {
	return status == STATUS_ERROR;
	}

	public String getStatusString() {
	switch (status) {
	case STATUS_RESOLVED:
	return "resolved";
	case STATUS_UNRESOLVED:
	return "deferred";
	case STATUS_ERROR:
	return "erroneous";
	}
	return "unknown";
	}

	boolean isJavaIdentifier(String s) {
	return Utils.isJavaIdentifier(s);
	}

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

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