PathParts.java

/*
 * Copyright Robert Newson
 *
 * Licensed 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 com.github.rnewson.couchdb.lucene;

import javax.servlet.http.HttpServletRequest;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PathParts {

    private static final Pattern QUERY_REGEX = Pattern
            .compile("^/([^/]+)/([^/]+)/_design/([^/]+)/([^/]+)/?([^/]+)?");

    private static final Pattern GLOBAL_REGEX = Pattern
            .compile("^/([^/]+)/([^/]+)/((([^/]+)))");

    private Matcher matcher;

    public PathParts(final HttpServletRequest req) {
        this(req.getRequestURI());
    }

    public PathParts(final String path) {
        matcher = QUERY_REGEX.matcher(path);
        if (!matcher.matches()) {
            matcher = GLOBAL_REGEX.matcher(path);
        }
        if (!matcher.matches()) {
            throw new IllegalArgumentException(path + " is not a valid path");
        }
    }

    public String getKey() {
        return matcher.group(1);
    }

    public String getDesignDocumentName() {
        return "_design/" + matcher.group(3);
    }

    public String getDatabaseName() {
        return matcher.group(2);
    }

    public String getViewName() {
        return matcher.group(4);
    }

    public String getCommand() {
        if (matcher.groupCount() != 5) {
            return null;
        }
        return matcher.group(5);
    }

    @Override
    public String toString() {
        return "PathParts [getCommand()=" + getCommand()
                + ", getDatabaseName()=" + getDatabaseName()
                + ", getDesignDocumentName()=" + getDesignDocumentName()
                + ", getKey()=" + getKey() + ", getViewName()=" + getViewName()
                + "]";
    }

}