org.sbs.goodcrawler.extractor.selector.PageElementSelector.java Source code

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Here is the source code for org.sbs.goodcrawler.extractor.selector.PageElementSelector.java

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/**
 * ########################  SHENBAISE'S WORK  ##########################
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.sbs.goodcrawler.extractor.selector;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpStatus;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.sbs.goodcrawler.bootstrap.foreman.FetchForeman;
import org.sbs.goodcrawler.exception.ExtractException;
import org.sbs.goodcrawler.extractor.GCPage;
import org.sbs.goodcrawler.extractor.selector.action.SelectorAction;
import org.sbs.goodcrawler.fetcher.CustomFetchStatus;
import org.sbs.goodcrawler.page.Page;
import org.sbs.goodcrawler.page.PageFetchResult;
import org.sbs.goodcrawler.page.Parser;
import org.sbs.url.WebURL;
import org.sbs.util.MapUtils;
import org.sbs.util.UrlUtils;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * @author whiteme
 * @date 20131013
 * @desc Url?Url??Url????
 */
public class PageElementSelector extends AbstractElementCssSelector<HashMap<String, Object>> implements GCPage {
    /**
     * Url
     */
    List<AbstractElementCssSelector<?>> selectors = Lists.newArrayList();
    /**
     * Url???
     */
    HashMap<String, Object> content;
    private Object lock = new Object();

    private Parser parser = new Parser(false);
    private UrlUtils urlUtils = new UrlUtils();

    /**
     * Url????
     */
    public PageElementSelector() {
        super();
    }

    public PageElementSelector(String name, String value, String attr, boolean isRequired, int index,
            String regex) {
        super(name, value, attr, isRequired, index, regex);
    }

    public List<AbstractElementCssSelector<?>> getSelectors() {
        return selectors;
    }

    public void setSelectors(List<AbstractElementCssSelector<?>> selectors) {
        this.selectors = selectors;
    }

    public void addSelector(AbstractElementCssSelector<?> selector) {
        this.selectors.add(selector);
    }

    @SuppressWarnings("unchecked")
    @Override
    public HashMap<String, Object> getContent() throws ExtractException {
        if (null != content && !newDoc) {
            return content;
        }
        // ??document
        if (!newDoc) {
            return content;
        }
        // ?documentSelector
        List<String> urls = Lists.newArrayList();
        if (super.document != null) {
            Elements elements = super.document.select(value);
            if (elements.isEmpty())
                return null;
            switch ($Attr) {
            case text:
                for (Element e : elements) {
                    urls.add(e.text());
                }
                break;
            default:
                for (Element e : elements) {
                    urls.add(e.attr(attr));
                }
                break;
            }
        }
        if (urls.size() > 0) {
            content = Maps.newHashMap();
            for (String url : urls) {
                Document doc = null;
                PageFetchResult result = null;
                try {
                    WebURL webUrl = new WebURL();
                    webUrl.setURL(url);
                    result = FetchForeman.fetcher.fetchHeader(webUrl);
                    // ??
                    int statusCode = result.getStatusCode();
                    if (statusCode == CustomFetchStatus.PageTooBig) {
                        return null;
                    }
                    if (statusCode != HttpStatus.SC_OK) {
                        return null;
                    } else {
                        Page page = new Page(webUrl);
                        if (!result.fetchContent(page)) {
                            return null;
                        }
                        if (!parser.parse(page, webUrl.getURL())) {
                            return null;
                        }
                        doc = Jsoup.parse(new String(page.getContentData(), page.getContentCharset()),
                                urlUtils.getBaseUrl(page.getWebURL().getURL()));
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new ExtractException(e.getMessage());
                } finally {
                    if (result != null)
                        result.discardContentIfNotConsumed();
                }

                if (selectors != null)
                    for (AbstractElementCssSelector<?> selector : selectors) {
                        if (selector instanceof FileElementCssSelector) {
                            Map<String, Object> m = ((FileElementCssSelector) selector).setResult(content)
                                    .setDocument(doc).getContentMap();
                            if ((null == m || m.size() == 0) && selector.isRequired()) {
                                return null;
                            } else {
                                if (null != m && m.size() > 0)
                                    content = MapUtils.mager(content, (HashMap<String, Object>) m);
                            }
                        } else {
                            Map<String, Object> m = selector.setDocument(doc).getContentMap();
                            if ((null == m || m.size() == 0) && selector.isRequired()) {
                                return null;
                            } else {
                                if (null != m && m.size() > 0)
                                    content = MapUtils.mager(content, (HashMap<String, Object>) m);
                            }
                        }
                    }
            }
            return content;
        }
        newDoc = false;
        return null;
    }

    @Override
    public Map<String, HashMap<String, Object>> getContentMap() throws ExtractException {
        if (newDoc) {
            synchronized (lock) {
                getContent();
            }
        }
        if (content == null || content.size() == 0)
            return null;
        HashMap<String, HashMap<String, Object>> map = new HashMap<>(1);
        map.put(name, content);
        return map;
    }

    @Override
    public void addAction(SelectorAction action) {

    }
}