Java example source code file (JNITypeParser.java)

This example Java source code file (JNITypeParser.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, illegalargumentexception, invalid, jni, jnitypeparser, list, signature_endclass, signature_endfunc, signature_func, string, stringbuffer, util

The JNITypeParser.java Java example source code

/*
 * Copyright (c) 2002, 2003, 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.
 *
 * 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.
 *
 */

package sun.jvm.hotspot.jdi;

import java.util.List;
import java.util.ArrayList;

public class JNITypeParser {

    static final char SIGNATURE_ENDCLASS = ';';
    static final char SIGNATURE_FUNC = '(';
    static final char SIGNATURE_ENDFUNC = ')';

    private String signature;
    private List typeNameList;
    private List signatureList;
    private int currentIndex;

    JNITypeParser(String signature) {
        this.signature = signature;
    }

    static String typeNameToSignature(String signature) {
        StringBuffer buffer = new StringBuffer();
        int firstIndex = signature.indexOf('[');
        int index = firstIndex;
        while (index != -1) {
            buffer.append('[');
            index = signature.indexOf('[', index + 1);
        }

        if (firstIndex != -1) {
            signature = signature.substring(0, firstIndex);
        }

        if (signature.equals("boolean")) {
            buffer.append('Z');
        } else if (signature.equals("byte")) {
            buffer.append('B');
        } else if (signature.equals("char")) {
            buffer.append('C');
        } else if (signature.equals("short")) {
            buffer.append('S');
        } else if (signature.equals("int")) {
            buffer.append('I');
        } else if (signature.equals("long")) {
            buffer.append('J');
        } else if (signature.equals("float")) {
            buffer.append('F');
        } else if (signature.equals("double")) {
            buffer.append('D');
        } else {
            buffer.append('L');
            buffer.append(signature.replace('.', '/'));
            buffer.append(';');
        }

        return buffer.toString();
    }

    String typeName() {
        return (String)typeNameList().get(typeNameList().size()-1);
    }

    List argumentTypeNames() {
        return typeNameList().subList(0, typeNameList().size() - 1);
    }

    String signature() {
        return (String)signatureList().get(signatureList().size()-1);
    }

    List argumentSignatures() {
        return signatureList().subList(0, signatureList().size() - 1);
    }

    int dimensionCount() {
        int count = 0;
        String signature = signature();
        while (signature.charAt(count) == '[') {
            count++;
        }
        return count;
    }

    String componentSignature(int level) {
        return signature().substring(level);
    }

    private synchronized List signatureList() {
        if (signatureList == null) {
            signatureList = new ArrayList(10);
            String elem;

            currentIndex = 0;

            while(currentIndex < signature.length()) {
                elem = nextSignature();
                signatureList.add(elem);
            }
            if (signatureList.size() == 0) {
                throw new IllegalArgumentException("Invalid JNI signature '" +
                                                   signature + "'");
            }
        }
        return signatureList;
    }

    private synchronized List typeNameList() {
        if (typeNameList == null) {
            typeNameList = new ArrayList(10);
            String elem;

            currentIndex = 0;

            while(currentIndex < signature.length()) {
                elem = nextTypeName();
                typeNameList.add(elem);
            }
            if (typeNameList.size() == 0) {
                throw new IllegalArgumentException("Invalid JNI signature '" +
                                                   signature + "'");
            }
        }
        return typeNameList;
    }

    private String nextSignature() {
        char key = signature.charAt(currentIndex++);

        switch(key) {
            case '[':
                return  key + nextSignature();

            case 'L':
                int endClass = signature.indexOf(SIGNATURE_ENDCLASS,
                                                 currentIndex);
                String retVal = signature.substring(currentIndex - 1,
                                                    endClass + 1);
                currentIndex = endClass + 1;
                return retVal;

            case 'V':
            case 'Z':
            case 'B':
            case 'C':
            case 'S':
            case 'I':
            case 'J':
            case 'F':
            case 'D':
                return String.valueOf(key);

            case SIGNATURE_FUNC:
            case SIGNATURE_ENDFUNC:
                return nextSignature();

            default:
                throw new IllegalArgumentException(
                    "Invalid JNI signature character '" + key + "'");

        }
    }

    private String nextTypeName() {
        char key = signature.charAt(currentIndex++);

        switch(key) {
            case '[':
                return  nextTypeName() + "[]";

            case 'B':
                return "byte";

            case 'C':
                return "char";

            case 'L':
                int endClass = signature.indexOf(SIGNATURE_ENDCLASS,
                                                 currentIndex);
                String retVal = signature.substring(currentIndex,
                                                    endClass);
                retVal = retVal.replace('/','.');
                currentIndex = endClass + 1;
                return retVal;

            case 'F':
                return "float";

            case 'D':
                return "double";

            case 'I':
                return "int";

            case 'J':
                return "long";

            case 'S':
                return "short";

            case 'V':
                return "void";

            case 'Z':
                return "boolean";

            case SIGNATURE_ENDFUNC:
            case SIGNATURE_FUNC:
                return nextTypeName();

            default:
                throw new IllegalArgumentException(
                    "Invalid JNI signature character '" + key + "'");

        }
    }
}