net.sf.uadetector.json.internal.data.deserializer.BrowserPatternDeserializer.java Source code

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/*******************************************************************************
 * Copyright 2013 Andr Roul
 * 
 * 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.sf.uadetector.json.internal.data.deserializer;

import static net.sf.uadetector.json.internal.data.field.SerializableOrderedPatternField.HASH;
import static net.sf.uadetector.json.internal.data.field.SerializableOrderedPatternField.PATTERN;

import java.lang.reflect.Type;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Pattern;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import net.sf.qualitycheck.Check;
import net.sf.uadetector.internal.data.domain.BrowserPattern;
import net.sf.uadetector.json.SerDeOption;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;

public final class BrowserPatternDeserializer extends AbstractDeserializer<BrowserPattern>
        implements JsonDeserializer<BrowserPattern> {

    private final Map<String, BrowserPattern> browserPatterns = new HashMap<String, BrowserPattern>();

    private final AtomicInteger counter = new AtomicInteger(0);

    public BrowserPatternDeserializer(final EnumSet<SerDeOption> options) {
        super(options);
    }

    @Override
    public BrowserPattern deserialize(final JsonElement json, final Type typeOfT,
            final JsonDeserializationContext context) {
        String hash = EMPTY_HASH_CODE;
        Pattern pattern = null;

        // deserialize
        for (final Entry<String, JsonElement> entry : json.getAsJsonObject().entrySet()) {
            if (PATTERN.getName().equals(entry.getKey())) {
                pattern = context.deserialize(entry.getValue(), Pattern.class);
            } else if (HASH.getName().equals(entry.getKey())) {
                hash = entry.getValue().getAsString();
            }
        }
        final int id = counter.incrementAndGet();

        // create browser pattern
        BrowserPattern browserPattern = null;
        try {
            browserPattern = new BrowserPattern(id, pattern, id);

            // check hash when option is set
            checkHash(json, hash, browserPattern);

            // add pattern to map
            browserPatterns.put(hash, browserPattern);
        } catch (final Exception e) {
            addWarning(e.getLocalizedMessage());
        }

        return browserPattern;
    }

    @Nullable
    public BrowserPattern findBrowserPattern(@Nonnull final String hash) {
        Check.notEmpty(hash, "hash");
        final BrowserPattern browserPattern = browserPatterns.get(hash);
        if (browserPattern == null) {
            addWarning("Can not find browser pattern for hash '" + hash + "'.");
        }
        return browserPattern;
    }

}