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/*******************************************************************************
* Copyright (c) 2014 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.rcp.internal.extension.impl;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import org.eclipse.emf.compare.rcp.internal.extension.IItemDescriptor;
/**
* Abstract class for an {@link IItemDescriptor}.
*
* @author <a href="mailto:arthur.daussy@obeo.fr">Arthur Daussy</a>
* @param <T>
* item type
*/
public abstract class AbstractItemDescriptor<T> implements IItemDescriptor<T> {
/** EMPTY_STRING. */
protected static final String EMPTY_STRING = ""; //$NON-NLS-1$
/** Label of the item. */
private final String label;
/** Description of the item. */
private final String description;
/** Rank of the item. */
private final int rank;
/** ID of the item (Use as key for the registry). */
private final String id;
/**
* Constructor.
*
* @param label
* {@link AbstractItemDescriptor#label}
* @param description
* {@link AbstractItemDescriptor#description}
* @param rank
* {@link AbstractItemDescriptor#rank}
* @param id
* {@link AbstractItemDescriptor#id}
*/
public AbstractItemDescriptor(String label, String description, int rank, String id) {
super();
Preconditions.checkNotNull(id);
if (label != null) {
this.label = label;
} else {
this.label = id;
}
if (description != null) {
this.description = description;
} else {
this.description = EMPTY_STRING;
}
this.rank = rank;
this.id = id;
}
/**
* {@inheritDoc}
*/
public String getLabel() {
return label;
}
/**
* {@inheritDoc}
*/
public String getDescription() {
return description;
}
/**
* {@inheritDoc}
*/
public int getRank() {
return rank;
}
/**
* {@inheritDoc}
*/
public String getID() {
return id;
}
/**
* {@inheritDoc}
*/
public int compareTo(IItemDescriptor<T> o) {
Preconditions.checkNotNull(o);
int comp = getRank() - o.getRank();
if (comp == 0) {
comp = getID().compareTo(o.getID());
}
return comp;
}
/**
* get a {@link Function} to transform a descriptor into a item.
*
* @param <T>
* A item type
* @return A item
*/
public static <T> Function<IItemDescriptor<T>, T> getItemFunction() {
return new Function<IItemDescriptor<T>, T>() {
public T apply(IItemDescriptor<T> input) {
if (input != null) {
return input.getItem();
}
return null;
}
};
}
}
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