com.blacklocus.jres.strings.JresPaths.java Source code

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Here is the source code for com.blacklocus.jres.strings.JresPaths.java

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/**
 * Copyright 2013 BlackLocus
 *
 * 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.blacklocus.jres.strings;

import org.apache.commons.lang3.StringUtils;

import java.net.URI;
import java.net.URISyntaxException;

public class JresPaths {

    /**
     * @return fragments each appended with '/' if not present, and concatenated together
     */
    public static String slashed(String... fragments) {
        StringBuilder sb = new StringBuilder();
        for (String fragment : fragments) {
            sb.append(StringUtils.isBlank(fragment) || fragment.endsWith("/") ? (fragment == null ? "" : fragment)
                    : fragment + "/");
        }
        return sb.toString();
    }

    /**
     * @return fragments encoded as valid URI path sections, each appended with '/' if not present. <code>null</code>s
     * upgraded to empty strings. Appends nothing to blank strings (and nulls). Any leading slashes will be dropped.
     */
    public static String slashedPath(String... fragments) {
        String slashed = slashed(fragments);
        try {
            // Encode (anything that needs to be) in the path. Surprisingly this works.
            String encodedPath = new URI(null, null, slashed, null).getRawPath();
            // Strip leading slash. Omitting it is slightly more portable where URIs are being constructed.
            return encodedPath.startsWith("/") ? encodedPath.substring(1) : encodedPath;
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
    }
}