/*
 * Copyright 2005 the original author or authors.
 * 
 * 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.wamblee.crawler.impl;

import org.apache.commons.httpclient.NameValuePair;
import org.dom4j.Element;
import org.wamblee.crawler.Action;
import org.wamblee.crawler.Crawler;
import org.wamblee.crawler.Page;
import org.wamblee.crawler.PageException;
import org.wamblee.crawler.PageType;

/**
 * Action implementation.
 */
public class ActionImpl implements Action {

    private Crawler _crawler;

    private Element _content;

    private String _name;

    private String _reference;

    private PageType _type;
    
    private NameValuePair[] _parameters; 

    /**
     * Constructs the action.
     * 
     * @param aCrawler
     *            Crawler to use.
     * @param aContent
     *            Content of the action element in the page where the action
     *            occurs.
     * @param aName
     *            Name of the action.
     * @param aReference
     *            URL of the reference.
     * @param aParameters Parameters to use for the action. 
     */
    public ActionImpl(Crawler aCrawler, Element aContent, String aName,
            String aReference, NameValuePair[] aParameters) {
        _crawler = aCrawler;
        _content = aContent;
        _name = aName;
        _reference = aReference;
        _type = null;
        _parameters = aParameters; 
    }

    /**
     * Constructs the action.
     * 
     * @param aCrawler
     *            Crawler to use.
     * @param aContent
     *            Content of the action element in the page where the action
     *            occurs.
     * @param aName
     *            Name of the action.
     * @param aReference
     *            URL of the reference.
     * @param aType
     *            Type of the referenced page.
     * @param aParameters Parameters to use. 
     */
    public ActionImpl(Crawler aCrawler, Element aContent, String aName,
            String aReference, PageType aType, NameValuePair[] aParameters) {
        _crawler = aCrawler;
        _content = aContent;
        _name = aName;
        _reference = aReference;
        _type = aType;
        _parameters = aParameters; 
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.crawler.Action#getName()
     */
    public String getName() {
        return _name;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.crawler.Action#execute()
     */
    public Page execute() throws PageException {
        if (_type == null) {
            return _crawler.getPage(_reference, _parameters);
        }
        return _crawler.getPage(_reference, _parameters, _type);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.crawler.Action#getContent()
     */
    public Element getContent() {
        return _content;
    }
    
    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if ( !(obj instanceof ActionImpl )) { 
            return false; 
        }
        ActionImpl action = (ActionImpl)obj; 
        return _reference.equals(action._reference) && 
               _type.equals(action._type);
    }
}