org.nnsoft.sameas4j.AbstractEquivalenceDeserializer.java Source code

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Here is the source code for org.nnsoft.sameas4j.AbstractEquivalenceDeserializer.java

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/*
 * Copyright (c) 2009-2012 The 99 Software Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.nnsoft.sameas4j;

import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.util.BitSet;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;

/**
 * Basic Json adapter that given a JsonElement builds a
 * not null an {@link Equivalence} instance.
 */
abstract class AbstractEquivalenceDeserializer {

    /**
     * The {@code uri} constant.
     */
    private static final String URI = "uri";

    /**
     * The {@code duplicates} constant.
     */
    private static final String DUPLICATES = "duplicates";

    /**
     * The error message template constant.
     */
    private static final String EXCEPTION_MESSAGE = "URI '%s' seems to be not well-formed";

    /**
     * The UTF-8 string constant.
     */
    private static final String UTF_8_ENCODING = "UTF-8";

    /**
     * BitSet of unreserved characters.
     */
    private static final BitSet UNRESERVED_CHARS = new BitSet(256);

    /**
     * The default escaping character of URL encoding.
     */
    private static final byte URL_ESCAPE_CHAR = '%';

    static {
        for (byte b = 'A'; b <= 'Z'; b++) {
            UNRESERVED_CHARS.set(b);
        }
        for (byte b = 'a'; b <= 'z'; b++) {
            UNRESERVED_CHARS.set(b);
        }
        for (byte b = '0'; b <= '9'; b++) {
            UNRESERVED_CHARS.set(b);
        }

        // special URL encoding chars
        UNRESERVED_CHARS.set('$');
        UNRESERVED_CHARS.set('#');
        UNRESERVED_CHARS.set('&');
        UNRESERVED_CHARS.set('+');
        UNRESERVED_CHARS.set(',');
        UNRESERVED_CHARS.set(';');
        UNRESERVED_CHARS.set('=');
        UNRESERVED_CHARS.set('?');
        UNRESERVED_CHARS.set('@');
        UNRESERVED_CHARS.set('/');
        UNRESERVED_CHARS.set(':');
        UNRESERVED_CHARS.set('-');
        UNRESERVED_CHARS.set('.');
        UNRESERVED_CHARS.set('_');
        UNRESERVED_CHARS.set('~');
    }

    /**
     * Encodes the given text.
     *
     * @param text text to be encoded.
     * @return encoding result.
     */
    public static String urlEncode(final String text) throws Exception {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();

        for (int b : toUTF8Bytes(text)) {
            if (b < 0) {
                b = 256 + b;
            }

            if (UNRESERVED_CHARS.get(b)) {
                buffer.write(b);
            } else {
                buffer.write(URL_ESCAPE_CHAR);
                char hex1 = Character.toUpperCase(Character.forDigit((b >> 4) & 0xF, 16));
                char hex2 = Character.toUpperCase(Character.forDigit(b & 0xF, 16));
                buffer.write(hex1);
                buffer.write(hex2);
            }
        }

        return new String(buffer.toByteArray());
    }

    /**
     * Performs an UTF8 encoding.
     *
     * @param text text to be encoded.
     * @return encoding result.
     */
    private static byte[] toUTF8Bytes(final String text) throws Exception {
        return text.getBytes(UTF_8_ENCODING);
    }

    /**
     * Deserialize a single {@link org.nnsoft.sameas4j.Equivalence}
     * from its Json serialization.
     *
     * @param json object to be deserialized
     * @return a not null {@link org.nnsoft.sameas4j.Equivalence} instance
     */
    public Equivalence getEquivalence(JsonElement json) {
        Equivalence equivalence;
        String uriString = json.getAsJsonObject().getAsJsonPrimitive(URI).getAsString();
        URI uri;
        try {
            uri = new URI(urlEncode(uriString));
        } catch (Exception e) {
            throw new JsonParseException(String.format(EXCEPTION_MESSAGE, uriString));
        }
        equivalence = new Equivalence(uri);
        JsonArray duplicates = json.getAsJsonObject().getAsJsonArray(DUPLICATES);
        for (int i = 0; i < duplicates.size(); i++) {
            try {
                equivalence.addDuplicate(new URI(urlEncode(duplicates.get(i).getAsString())));
            } catch (Exception e) {
                // if an equivalent URI is not well-formed it's better to do not add it, let's go on
                continue;
            }
        }
        return equivalence;
    }

    public static void main(String[] args) throws Exception {
        System.err.println(urlEncode("http://it.bestshopping.com/prezzi/Rome.sku=9780751339031|.html"));
    }

}