jmms.core.MetaResource Maven / Gradle / Ivy

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/*
 * Copyright 2019 the original author or authors.
 *
 * 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 jmms.core;

import leap.lang.Strings;
import leap.lang.net.Urls;
import leap.lang.path.Paths;
import leap.lang.resource.Resource;

/**
 * The resource of metadata.
 */
public interface MetaResource {

    static String pathByUrl(Resource root, Resource child) {
        String rootUrl  = root.getURLString();
        String childUrl = child.getURLString();

        String relativeUri = Strings.removeStart(childUrl, rootUrl);
        if (relativeUri.equals(childUrl)) {
            throw new IllegalStateException("Invalid child '" + childUrl + "' of root '" + rootUrl + "'");
        }
        return Paths.prefixWithoutSlash(Paths.normalize(relativeUri));
    }

    static String pathByClass(String root, Resource child) {
        root = Paths.prefixWithoutAndSuffixWithSlash(root);
        String cp = Paths.prefixWithoutSlash(child.getClasspath());

        String relativeUri = Strings.removeStart(cp, root);
        if (relativeUri.equals(cp)) {
            throw new IllegalStateException("Invalid child '" + cp + "' of root '" + root + "'");
        }
        return relativeUri;
    }

    static String pathByFile(String root, Resource file) {
        String childPath = Urls.decode(Paths.normalize(file.getFilepath()));

        root = Paths.prefixAndSuffixWithSlash(root);
        int index = childPath.indexOf(root);
        if (index <= 0) {
            throw new IllegalStateException("Invalid root '" + root + "' at '" + file.getURLString() + "'");
        }

        String relativePath =
                Paths.prefixWithAndSuffixWithoutSlash(childPath.substring(index + root.length()));

        return relativePath.replace('\\', '/');
    }

    /**
     * Is the resource exists?
     */
    default boolean exists() {
        return null != getReal() && getReal().exists();
    }

    /**
     * Returns the real resource.
     */
    Resource getReal();

    /**
     * The path relative to the root.
     */
    String getPath();

}