/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.activities;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.ui.activities.CategoryEvent;
import org.eclipse.ui.activities.ICategory;
import org.eclipse.ui.activities.ICategoryActivityBinding;
import org.eclipse.ui.activities.ICategoryListener;
import org.eclipse.ui.activities.NotDefinedException;
import org.eclipse.ui.internal.util.Util;

final class Category implements ICategory {
    private final static int HASH_FACTOR = 89;

    private final static int HASH_INITIAL = Category.class.getName().hashCode();

    private final static Set strongReferences = new HashSet();

    private Set categoryActivityBindings;

    private transient ICategoryActivityBinding[] categoryActivityBindingsAsArray;

    private List categoryListeners;

    private boolean defined;

    private transient int hashCode = HASH_INITIAL;

    private String id;

    private String name;

    private transient String string;

    private String description;

    Category(String id) {
        if (id == null)
            throw new NullPointerException();

        this.id = id;
    }

    public void addCategoryListener(ICategoryListener categoryListener) {
        if (categoryListener == null)
            throw new NullPointerException();

        if (categoryListeners == null)
            categoryListeners = new ArrayList();

        if (!categoryListeners.contains(categoryListener))
            categoryListeners.add(categoryListener);

        strongReferences.add(this);
    }

    public int compareTo(Object object) {
        Category castedObject = (Category) object;
        int compareTo = Util.compare(
                (Comparable[]) categoryActivityBindingsAsArray,
                (Comparable[]) castedObject.categoryActivityBindingsAsArray);

        if (compareTo == 0) {
            compareTo = Util.compare(defined, castedObject.defined);

            if (compareTo == 0) {
                compareTo = Util.compare(id, castedObject.id);

                if (compareTo == 0)
                    compareTo = Util.compare(name, castedObject.name);
            }
        }

        return compareTo;
    }

    public boolean equals(Object object) {
        if (!(object instanceof Category))
            return false;

        final Category castedObject = (Category) object;
        if (!Util.equals(categoryActivityBindings,
                castedObject.categoryActivityBindings)) {
            return false;
        }
        
        if (!Util.equals(defined, castedObject.defined)) {
            return false;
        }
        
        if (!Util.equals(id, castedObject.id)) {
            return false;
        }
        
        return Util.equals(name, castedObject.name);
    }

    void fireCategoryChanged(CategoryEvent categoryEvent) {
        if (categoryEvent == null)
            throw new NullPointerException();

        if (categoryListeners != null)
            for (int i = 0; i < categoryListeners.size(); i++)
                ((ICategoryListener) categoryListeners.get(i))
                        .categoryChanged(categoryEvent);
    }

    public Set getCategoryActivityBindings() {
        return categoryActivityBindings;
    }

    public String getId() {
        return id;
    }

    public String getName() throws NotDefinedException {
        if (!defined)
            throw new NotDefinedException();

        return name;
    }

    public int hashCode() {
        if (hashCode == HASH_INITIAL) {
            hashCode = hashCode * HASH_FACTOR
                    + Util.hashCode(categoryActivityBindings);
            hashCode = hashCode * HASH_FACTOR + Util.hashCode(defined);
            hashCode = hashCode * HASH_FACTOR + Util.hashCode(id);
            hashCode = hashCode * HASH_FACTOR + Util.hashCode(name);
            if (hashCode == HASH_INITIAL)
                hashCode++;
        }

        return hashCode;
    }

    public boolean isDefined() {
        return defined;
    }

    public void removeCategoryListener(ICategoryListener categoryListener) {
        if (categoryListener == null)
            throw new NullPointerException();

        if (categoryListeners != null)
            categoryListeners.remove(categoryListener);

        if (categoryListeners.isEmpty())
            strongReferences.remove(this);
    }

    boolean setCategoryActivityBindings(Set categoryActivityBindings) {
        categoryActivityBindings = Util.safeCopy(categoryActivityBindings,
                ICategoryActivityBinding.class);

        if (!Util.equals(categoryActivityBindings,
                this.categoryActivityBindings)) {
            this.categoryActivityBindings = categoryActivityBindings;
            this.categoryActivityBindingsAsArray = (ICategoryActivityBinding[]) this.categoryActivityBindings
                    .toArray(new ICategoryActivityBinding[this.categoryActivityBindings
                            .size()]);
            hashCode = HASH_INITIAL;
            string = null;
            return true;
        }

        return false;
    }

    boolean setDefined(boolean defined) {
        if (defined != this.defined) {
            this.defined = defined;
            hashCode = HASH_INITIAL;
            string = null;
            return true;
        }

        return false;
    }

    boolean setName(String name) {
        if (!Util.equals(name, this.name)) {
            this.name = name;
            hashCode = HASH_INITIAL;
            string = null;
            return true;
        }

        return false;
    }

    public String toString() {
        if (string == null) {
            final StringBuffer stringBuffer = new StringBuffer();
            stringBuffer.append('[');
            stringBuffer.append(categoryActivityBindings);
            stringBuffer.append(',');
            stringBuffer.append(defined);
            stringBuffer.append(',');
            stringBuffer.append(id);
            stringBuffer.append(',');
            stringBuffer.append(name);
            stringBuffer.append(']');
            string = stringBuffer.toString();
        }

        return string;
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.activities.ICategory#getDescription()
     */
    public String getDescription() throws NotDefinedException {
        if (!defined)
            throw new NotDefinedException();

        return description;
    }

    public boolean setDescription(String description) {
        if (!Util.equals(description, this.description)) {
            this.description = description;
            hashCode = HASH_INITIAL;
            string = null;
            return true;
        }

        return false;
    }
}
