bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/FilePropertySource.java

/************************************************************************
Copyright (c) 2000, 2003 IBM Corporation and others.
All rights reserved.   This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
	IBM - Initial implementation
************************************************************************/
package org.eclipse.ui.views.properties;

import java.io.File;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;

/**
 * The FilePropertySource gives the extra information that is shown for files
 */
public class FilePropertySource extends ResourcePropertySource {

	private static PropertyDescriptor fileDescriptor;
	{
		fileDescriptor =
			new PropertyDescriptor(
				IResourcePropertyConstants.P_SIZE_RES,
				IResourcePropertyConstants.P_DISPLAY_SIZE);
		fileDescriptor.setAlwaysIncompatible(true);
		fileDescriptor.setCategory(IResourcePropertyConstants.P_FILE_SYSTEM_CATEGORY);
	}	
/**
 * Creates an property source for a file resource.
 * @param file the file resource
 */
public FilePropertySource(IFile file) {
	super(file);
}
/**
 * Get a PropertyDescriptor that defines the size property
 * @return the PropertyDescriptor
 */
private static PropertyDescriptor getInitialPropertyDescriptor() {
	return fileDescriptor;
}
/* (non-Javadoc)
 * Method declared on IPropertySource.
 */
public IPropertyDescriptor[] getPropertyDescriptors() {
	IPropertyDescriptor[] superDescriptors = super.getPropertyDescriptors();
	int superLength = superDescriptors.length;
	IPropertyDescriptor[] fileDescriptors = new IPropertyDescriptor[superLength + 1];
	System.arraycopy(superDescriptors, 0, fileDescriptors, 0, superLength);
	fileDescriptors[superLength] = getInitialPropertyDescriptor();
	
	return fileDescriptors;
}
/* (non-Javadoc)
 * Method declared on IPropertySource.
 */
public Object getPropertyValue(Object key) {

	Object returnValue = super.getPropertyValue(key);
	
	if(returnValue != null)
		return returnValue;
		
	if (key.equals(IResourcePropertyConstants.P_SIZE_RES)) 
		return getSizeString((IFile) element);
	
	return null;
}
/**
 * Return a String that indicates the size of the supplied file.
 */
private String getSizeString(IFile file) {
	if (!file.isLocal(IResource.DEPTH_ZERO))
		return NOT_LOCAL_TEXT;
	else {
		IPath location = file.getLocation();
		if (location == null) {
			if (file.isLinked())
				return UNDEFINED_PATH_VARIABLE;
				
			return FILE_NOT_FOUND;
		}
		else {
			File localFile = location.toFile();
		
			if (localFile.exists()) {
				return Long.toString(localFile.length());
			}
			return FILE_NOT_FOUND;
		}
	}	
}

}