/*

 * 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.ClassPrepareRequest;

import java.util.StringTokenizer;

class PatternReferenceTypeSpec implements ReferenceTypeSpec {

    final String classId;

    String stem;

    PatternReferenceTypeSpec(String classId) throws ClassNotFoundException {

        this.classId = classId;

        stem = classId;

        if (classId.startsWith("*")) {

            stem = stem.substring(1);

        } else if (classId.endsWith("*")) {

            stem = stem.substring(0, classId.length() - 1);

        }

        checkClassName(stem);

    }

    /**

     * Is this spec unique or is it a class pattern?

     */

    public boolean isUnique() {

        return classId.equals(stem);

    }

    /**

     * Does the specified ReferenceType match this spec.

     */

    @Override

    public boolean matches(ReferenceType refType) {

        if (classId.startsWith("*")) {

            return refType.name().endsWith(stem);

        } else if (classId.endsWith("*")) {

            return refType.name().startsWith(stem);

        } else {

            return refType.name().equals(classId);

        }

    }

    @Override

    public ClassPrepareRequest createPrepareRequest() {

        ClassPrepareRequest request =

            Env.vm().eventRequestManager().createClassPrepareRequest();

        request.addClassFilter(classId);

        request.addCountFilter(1);

        return request;

    }

    @Override

    public int hashCode() {

        return classId.hashCode();

    }

    @Override

    public boolean equals(Object obj) {

        if (obj instanceof PatternReferenceTypeSpec) {

            PatternReferenceTypeSpec spec = (PatternReferenceTypeSpec)obj;

            return classId.equals(spec.classId);

        } else {

            return false;

        }

    }

    private void checkClassName(String className) throws ClassNotFoundException {

        // Do stricter checking of class name validity on deferred

        //  because if the name is invalid, it will

        // never match a future loaded class, and we'll be silent

        // about it.

        StringTokenizer tokenizer = new StringTokenizer(className, ".");

        while (tokenizer.hasMoreTokens()) {

            String token = tokenizer.nextToken();

            // Each dot-separated piece must be a valid identifier

            // and the first token can also be "*". (Note that

            // numeric class ids are not permitted. They must

            // match a loaded class.)

            if (!isJavaIdentifier(token)) {

                throw new ClassNotFoundException();

            }

        }

    }

    private 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;

    }

    @Override

    public String toString() {

        return classId;

    }

}