Copyright (c) 2008, http://www.snakeyaml.org
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.
/**
 * Copyright (c) 2008, http://www.snakeyaml.org
 *
 * 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 org.yaml.snakeyaml.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;

import org.yaml.snakeyaml.error.YAMLException;
import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.Escaper;
import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.PercentEscaper;

public abstract class UriEncoder {
    private static final CharsetDecoder UTF8Decoder = Charset.forName("UTF-8").newDecoder()
            .onMalformedInput(CodingErrorAction.REPORT);
    // Include the [] chars to the SAFEPATHCHARS_URLENCODER to avoid
    // its escape as required by spec. See
    // http://yaml.org/spec/1.1/#escaping%20in%20URI/
    private static final String SAFE_CHARS = PercentEscaper.SAFEPATHCHARS_URLENCODER + "[]/";
    private static final Escaper escaper = new PercentEscaper(SAFE_CHARS, false);

    
Escape special characters with '%'
Params:
uri – URI to be escaped
Returns:
encoded URI/**
     * Escape special characters with '%'
     * @param uri URI to be escaped
     * @return encoded URI
     */
    public static String encode(String uri) {
        return escaper.escape(uri);
    }

    
Decode '%'-escaped characters. Decoding fails in case of invalid UTF-8
Params:
buff – data to decode
Throws:
CharacterCodingException – if cannot be decoded
Returns:
decoded data/**
     * Decode '%'-escaped characters. Decoding fails in case of invalid UTF-8
     * @param buff data to decode
     * @return decoded data
     * @throws CharacterCodingException if cannot be decoded
     */
    public static String decode(ByteBuffer buff) throws CharacterCodingException {
        CharBuffer chars = UTF8Decoder.decode(buff);
        return chars.toString();
    }

    public static String decode(String buff) {
        try {
            return URLDecoder.decode(buff, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new YAMLException(e);
        }
    }
}