/*
 * Copyright (C) 2002-2004 Andrea Mazzolini
 * andreamazzolini@users.sourceforge.net
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package net.sourceforge.sqlexplorer.plugin.editors;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import net.sourceforge.sqlexplorer.dbproduct.User;

import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.IPersistableElement;
import org.eclipse.ui.IStorageEditorInput;

public class SQLEditorInput implements IStorageEditorInput, IPersistableElement
{
	private IStorage fStorage;
	private File fFile;
	private String fName;
	private User user;

	public SQLEditorInput(String name)
	{
		fName = name;
		createStorage();
	}
	
	public SQLEditorInput(File file)
	{
		fFile = file;
		createStorage();
	}
	
	private void createStorage()
	{
		fStorage = new IStorage()
		{
			public InputStream getContents() throws CoreException
			{
				try
				{
					return fFile != null ?
						new FileInputStream(fFile) :
						getClearStream();
				}
				catch (IOException e)
				{
					return getClearStream();
				}
			}
			
			private InputStream getClearStream()
			{
				return new ByteArrayInputStream(new byte[0]);
			}

			public IPath getFullPath()
			{
				return null;
			}

			public String getName()
			{
				return SQLEditorInput.this.getName();
			}

			public boolean isReadOnly()
			{
				return false;
			}

			public Object getAdapter(Class adapter)
			{
				return null;
			}
		};
	}

	public boolean exists()
	{
		return fFile != null ? fFile.exists() : false;
	}

	public ImageDescriptor getImageDescriptor()
	{
		return null;
	}

	public String getName()
	{
		return fFile != null ?
			fFile.getName() : fName;
	}

	public IPersistableElement getPersistable()
	{
		return fFile != null ? this : null;
	}

	public String getToolTipText()
	{
		return fFile != null ?
			fFile.getAbsolutePath() :
			getName();
	}

	public Object getAdapter(Class adapter)
	{
		return null;
	}

	public IStorage getStorage() throws CoreException
	{
		return fStorage;
	}
	
	public File getFile()
	{
		return fFile;
	}
	
	public String getFactoryId()
	{
		return "net.sourceforge.sqlexplorer.plugin.editors.SQLEditorInputFactory";
	}

	public void saveState(IMemento memento)
	{
		if (fFile == null)
			return;
		memento.putString("path", fFile.getAbsolutePath());
	}
	
	public boolean equals(Object obj)
	{
		if (this == obj)
			return true;
		if (!(obj instanceof SQLEditorInput))
			return false;
		SQLEditorInput input = (SQLEditorInput) obj;
		return
			fFile == null && input.fFile == null ?
				fName == input.fName || fName != null &&  fName.equals(input.fName) :
				fFile == input.fFile ||
				fFile != null && fFile.equals(input.fFile);
	}

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

}