net.devmond.shell.handler.DecodeCommandHandler.java Source code

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Here is the source code for net.devmond.shell.handler.DecodeCommandHandler.java

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/*
 * Copyright (C) 2013 Stefan Moschinski
 * 
 * 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 net.devmond.shell.handler;

import static net.devmond.shell.handler.ResultMaker.textResult;
import static org.apache.commons.codec.binary.Base64.decodeBase64;

import java.net.URLDecoder;
import java.nio.charset.Charset;

import net.devmond.shell.CommandInput;
import net.devmond.shell.InvalidCommandException;
import net.devmond.shell.Option;
import net.devmond.shell.ValueStringOption;

import org.eclipse.osgi.framework.console.CommandInterpreter;

public class DecodeCommandHandler extends AbstractCommandHandler {

    private static final String UTF_8 = "UTF-8";
    private static final String HTML_ENCODING = "html";
    private static final String BASE64_ENCODING = "base64";
    private static final String URL_ENCODING = "url";
    private static final Option CHARSET_FLAG = new ValueStringOption("charset");

    public DecodeCommandHandler(CommandInterpreter cmdInterpreter) {
        super(cmdInterpreter, CHARSET_FLAG);
    }

    @Override
    protected Result executeInternal(CommandInput input) throws Exception {
        Charset charset = getConfiguredCharset(input.getValueForOption(CHARSET_FLAG));

        String encoding = input.nextArgument().toLowerCase();
        String arg = input.nextArgument();

        if (URL_ENCODING.equals(encoding))
            return textResult(URLDecoder.decode(arg, charset.toString()));

        if (BASE64_ENCODING.equals(encoding))
            return textResult(new String(decodeBase64(arg.getBytes(charset)), charset));

        if (HTML_ENCODING.equals(encoding))
            throw new UnsupportedOperationException();

        throw new InvalidCommandException(getHelpText());
    }

    private Charset getConfiguredCharset(Object configuredCharset) {
        return Charset.forName(configuredCharset == null ? UTF_8 : configuredCharset.toString());
    }

}