Ant example source code file (JakartaRegexpMatcher.java)

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

Java - Ant tags/keywords

buildexception, buildexception, jakartaregexpmatcher, match_case_insensitive, match_default, match_multiline, match_singleline, re, re, resyntaxexception, string, string, util, vector, vector

The JakartaRegexpMatcher.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package org.apache.tools.ant.util.regexp;

import java.util.Vector;
import org.apache.regexp.RE;
import org.apache.regexp.RESyntaxException;
import org.apache.tools.ant.BuildException;

/**
 * Implementation of RegexpMatcher for Jakarta-Regexp.
 *
 */
public class JakartaRegexpMatcher implements RegexpMatcher {

    private String pattern;

    /**
     * Set the regexp pattern from the String description.
     * @param pattern the pattern to match
     */
    public void setPattern(String pattern) {
        this.pattern = pattern;
    }

    /**
     * Get a String representation of the regexp pattern
     * @return the pattern
     */
    public String getPattern() {
        return pattern;
    }

    /**
     * Compile the pattern.
     *
     * @param options the ant regexp options
     * @return a compiled pattern
     * @exception BuildException if an error occurs
     */
    protected RE getCompiledPattern(int options)
        throws BuildException {
        int cOptions = getCompilerOptions(options);
        try {
            RE reg = new RE(pattern);
            reg.setMatchFlags(cOptions);
            return reg;
        } catch (RESyntaxException e) {
            throw new BuildException(e);
        }
    }

    /**
     * Does the given argument match the pattern?
     * @param argument the string to match against
     * @return true if the pattern matches
     * @throws BuildException on error
     */
    public boolean matches(String argument) throws BuildException {
        return matches(argument, MATCH_DEFAULT);
    }

    /**
     * Does the given argument match the pattern?
     * @param input the string to match against
     * @param options the regex options to use
     * @return true if the pattern matches
     * @throws BuildException on error
     */
    public boolean matches(String input, int options)
        throws BuildException {
        return matches(input, getCompiledPattern(options));
    }

    private boolean matches(String input, RE reg) {
        return reg.match(input);
    }

    /**
     * Returns a Vector of matched groups found in the argument
     * using default options.
     *
     * <p>Group 0 will be the full match, the rest are the
     * parenthesized subexpressions</p>.
     *
     * @param argument the string to match against
     * @return the vector of groups
     * @throws BuildException on error
     */
    public Vector getGroups(String argument) throws BuildException {
        return getGroups(argument, MATCH_DEFAULT);
    }

    /**
     * Returns a Vector of matched groups found in the argument.
     *
     * <p>Group 0 will be the full match, the rest are the
     * parenthesized subexpressions</p>.
     *
     * @param input the string to match against
     * @param options the regex options to use
     * @return the vector of groups
     * @throws BuildException on error
     */
    public Vector getGroups(String input, int options)
        throws BuildException {
        RE reg = getCompiledPattern(options);
        if (!matches(input, reg)) {
            return null;
        }
        Vector v = new Vector();
        int cnt = reg.getParenCount();
        for (int i = 0; i < cnt; i++) {
            String match = reg.getParen(i);
            // treat non-matching groups as empty matches
            if (match == null) {
                match = "";
            }
            v.addElement(match);
        }
        return v;
    }

    /**
     * Convert the generic options to the regex compiler specific options.
     * @param options the generic options
     * @return the specific options
     */
    protected int getCompilerOptions(int options) {
        int cOptions = RE.MATCH_NORMAL;

        if (RegexpUtil.hasFlag(options, MATCH_CASE_INSENSITIVE)) {
            cOptions |= RE.MATCH_CASEINDEPENDENT;
        }
        if (RegexpUtil.hasFlag(options, MATCH_MULTILINE)) {
            cOptions |= RE.MATCH_MULTILINE;
        }
        if (RegexpUtil.hasFlag(options, MATCH_SINGLELINE)) {
            cOptions |= RE.MATCH_SINGLELINE;
        }

        return cOptions;
    }

}