de.shadowhunt.subversion.internal.ResourcePropertyUtils.java Source code

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Here is the source code for de.shadowhunt.subversion.internal.ResourcePropertyUtils.java

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/**
 * Copyright (C) 2013 shadowhunt (dev@shadowhunt.de)
 *
 * 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 de.shadowhunt.subversion.internal;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.IOUtils;

/**
 * SVN as support for properties that have a namespace and contain a colon in their name. XML in general does not allow
 * such names. The methods in this class make sure these properties can be read and written by default XML tool by
 * escaping them before the XML processing and reverting the escaping afterwards.
 */
final class ResourcePropertyUtils {

    static final String COLON = ":";

    static final String MARKER = "__ILLEGAL_COLON_IN_TAG_NAME__";

    private static final String REGEX = "<(/?)(\\s*)([\\w\\d]+):([\\w\\d]+):([\\w\\d]+)((?:\\s*[\\w\\d=\"]*\\s*)*)(/?)>";

    private static final Pattern PATTERN = Pattern.compile(REGEX);

    static final Charset UTF8 = Charset.forName("UTF-8");

    static InputStream escapedInputStream(final InputStream inputStream) throws IOException {
        final String rawData = IOUtils.toString(inputStream, UTF8);
        inputStream.close();

        final Matcher matcher = PATTERN.matcher(rawData);
        final String escapedData = matcher.replaceAll("<$1$2$3:$4" + MARKER + "$5$6$7>");
        return IOUtils.toInputStream(escapedData, UTF8);
    }

    static String escapedKeyNameXml(final String name) {
        return name.replace(COLON, MARKER);
    }

    static String filterMarker(final String xml) {
        return xml.replaceAll(MARKER, COLON);
    }

    static String unescapedKeyNameXml(final String name) {
        return name.replace(MARKER, COLON);
    }

    private ResourcePropertyUtils() {
        // prevent instantiation
    }

}