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Java example source code file (NGCCRuntimeEx.java)

This example Java source code file (NGCCRuntimeEx.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, errorhandler, file, list, ngccruntimeex, pattern, regex, sax, saxexception, saxparseexception, string, stringbuilder, util

The NGCCRuntimeEx.java Java example source code

/*
 * Copyright (c) 1997, 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.
 */

package com.sun.tools.internal.jxc;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

import com.sun.tools.internal.jxc.gen.config.NGCCRuntime;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;


/**
 * Controls the  validating and converting  of values obtained
 * from the config file.
 *
 * @author
 *     Bhakti Mehta (bhakti.mehta@sun.com)
 */
public final class NGCCRuntimeEx extends NGCCRuntime {
    /**
     * All the errors shall be sent to this object.
     */
    private final ErrorHandler errorHandler;

    public NGCCRuntimeEx(ErrorHandler errorHandler) {
        this.errorHandler = errorHandler;
    }

    /**
     *  This will check if the baseDir provided by the user
     *  in the config file exists. If not it throws an error
     * @param baseDir
     *    The baseDir attribute passed by the user in the xml config file as a path
     * @return
     *     The file representation of the path name
     */
    public File getBaseDir(String baseDir) throws SAXException {
        File dir = new File(baseDir);
        if (dir.exists()) {
            return dir;
        } else {
            SAXParseException e = new SAXParseException(
                                Messages.BASEDIR_DOESNT_EXIST.format(dir.getAbsolutePath()),
                                getLocator());
            errorHandler.error(e);
            throw e;    // we can't recover from this error
        }
    }

    /**
     * This takes the include list provided by the user in the config file
     * It converts the user values to {@link Pattern}
     * @param includeContent
     *        The include list specified by the user
     * @return
     *        A list of regular expression patterns {@link Pattern}
     */
    public List<Pattern> getIncludePatterns(List includeContent ) {
        List<Pattern> includeRegexList = new ArrayList();
        for (String includes : includeContent) {
            String regex = convertToRegex(includes);
            Pattern pattern = Pattern.compile(regex);
            includeRegexList.add(pattern);
        }
        return includeRegexList;
    }


    /**
     * This takes the exclude list provided by the user in the config file
     * It converts the user values to {@link Pattern}
     * @param excludeContent
     *        The exclude list specified by the user
     * @return
     *        A list of regular expression patterns {@link Pattern}
     */
    public List getExcludePatterns(List<String> excludeContent ) {
        List<Pattern> excludeRegexList = new ArrayList();
        for (String excludes : excludeContent) {
            String regex = convertToRegex(excludes);
            Pattern pattern = Pattern.compile(regex);
            excludeRegexList.add(pattern);
        }
        return excludeRegexList;
    }


    /**
     * This will tokenize the pattern and convert it into a regular expression
     * @param pattern
     */
    private String convertToRegex(String pattern) {
        StringBuilder regex = new StringBuilder();
        char nc = ' ';
        if (pattern.length() >0 ) {

            for ( int i = 0 ; i < pattern.length(); i ++ ) {
                char c = pattern.charAt(i);
                nc = ' ';
                if ((i +1) != pattern.length()) {
                    nc = pattern.charAt(i +1);
                }
                //escape single '.'
                if (c == '.' &&  nc != '.'){
                    regex.append('\\');
                    regex.append('.');
                    //do not allow patterns like a..b
                } else if (c == '.'){
                    continue;
                    // "**" gets replaced by ".*"
                } else if ((c=='*') && (nc == '*')) {
                    regex.append(".*");
                    break;
                    //'*' replaced by anything but '.' i.e [^\\.]+
                } else if (c=='*') {
                    regex.append("[^\\.]+");
                    continue;
                    //'?' replaced by anything but '.' i.e [^\\.]
                } else if (c=='?') {
                    regex.append("[^\\.]");
                    //else leave the chars as they occur in the pattern
                } else
                    regex.append(c);
            }

        }

        return regex.toString();
    }

    protected void unexpectedX(String token) throws SAXException {
        errorHandler.error(
            new SAXParseException(Messages.UNEXPECTED_NGCC_TOKEN.format(
                token, getLocator().getLineNumber(), getLocator().getColumnNumber()),
                getLocator()));
    }
}

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