/**
 * Copyright (c) 2012, The National Archives <pronom@nationalarchives.gsi.gov.uk>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of the The National Archives nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package uk.gov.nationalarchives.droid.gui.treemodel;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

import uk.gov.nationalarchives.droid.core.interfaces.ResourceType;
import uk.gov.nationalarchives.droid.profile.ProfileResourceNode;

/**
 * 
 * @author rflitcroft
 *
 * @param <T> the source comparable
 */
public abstract class DirectoryComparableObject<T extends Comparable<T>> implements DirectoryComparable<T> {

    // The data value
    private T source;
    
    // The resource node the value is associated with.
    private ProfileResourceNode node;
    

    
    
    /**
     * 
     * @param source the source object
     * @param node the tree node from which we can compare various properties for sorting.
     */
    public DirectoryComparableObject(T source, ProfileResourceNode node) {
        this.source = source;
        this.node = node;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int compareTo(DirectoryComparable<T> o) {
        return nullSafeCompareTo(o);
    }

    private int nullSafeCompareTo(DirectoryComparable<T> o) {
        int compare;
        
        if (source == null && o == null) {
            compare = 0;
        } else if (source == null) {
            compare = -1;
        } else if (o == null || o.getSource() == null) {
            compare = 1;
        } else {
            compare = sourceCompareTo(o);
        }

        return compare;
    }
    
    /**
     * 
     * @param o The object to compare.
     * @return int the result of the source object comparison
     */
    protected int sourceCompareTo(DirectoryComparable<T> o) {
        return source.compareTo(o.getSource());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return source == null ? "" : source.toString();
    }
    
    /**
     * {@inheritDoc}
     * @see uk.gov.nationalarchives.droid.gui.treemodel.DirectoryComparable#getSource()
     */
    @Override
    public T getSource() {
        return source;
    }
    
    
    @Override
    public int getFilterStatus() {
        return node.getFilterStatus();
    }    
    
    
    /**
     * 
     * @return whether the object has a file extension mismatch.
     */
    public boolean getExtensionMismatch() {
        return node.getExtensionMismatch();
    }

    /**
     * {@inheritDoc}
     */
    //@Override
    //public Boolean isFile() {
    //    return file;
    //}
    @Override
    public ResourceType getResourceType() {
        return node.getMetaData().getResourceType();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return new HashCodeBuilder().append(source).toHashCode();
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        
        DirectoryComparableObject<T> other = (DirectoryComparableObject<T>) obj;
        return new EqualsBuilder().append(source, other.source).isEquals();
    }

}
