Copyright (c) 2000, 2015 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
    James Blackburn (Broadcom Corp.) - ongoing development
/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *******************************************************************************/
package org.eclipse.core.internal.resources;

import java.io.*;
import org.eclipse.core.internal.localstore.IHistoryStore;
import org.eclipse.core.internal.utils.Messages;
import org.eclipse.core.internal.utils.UniversalUniqueIdentifier;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.*;
import org.eclipse.core.runtime.content.IContentDescription;
import org.eclipse.core.runtime.content.IContentTypeManager;
import org.eclipse.osgi.util.NLS;

public class FileState extends PlatformObject implements IFileState {
	private static final IWorkspace workspace = ResourcesPlugin.getWorkspace();
	protected long lastModified;
	protected UniversalUniqueIdentifier uuid;
	protected IHistoryStore store;
	protected IPath fullPath;

	public FileState(IHistoryStore store, IPath fullPath, long lastModified, UniversalUniqueIdentifier uuid) {
		this.store = store;
		this.lastModified = lastModified;
		this.uuid = uuid;
		this.fullPath = fullPath;
	}

	@Override
	public boolean exists() {
		return store.exists(this);
	}

	@Override
	public String getCharset() throws CoreException {
		// if there is an existing file at this state's path, use the encoding of that file
		IResource file = workspace.getRoot().findMember(fullPath);
		if (file != null && file.getType() == IResource.FILE)
			return ((IFile) file).getCharset();

		// tries to obtain a description for the file contents
		IContentTypeManager contentTypeManager = Platform.getContentTypeManager();
		try (InputStream contents = new BufferedInputStream(getContents())) {
			IContentDescription description = contentTypeManager.getDescriptionFor(contents, getName(), new QualifiedName[] {IContentDescription.CHARSET});
			return description == null ? null : description.getCharset();
		} catch (IOException e) {
			String message = NLS.bind(Messages.history_errorContentDescription, getFullPath());
			throw new ResourceException(IResourceStatus.FAILED_DESCRIBING_CONTENTS, getFullPath(), message, e);
		}
	}

	@Override
	public InputStream getContents() throws CoreException {
		return store.getContents(this);
	}

	@Override
	public IPath getFullPath() {
		return fullPath;
	}

	@Override
	public long getModificationTime() {
		return lastModified;
	}

	@Override
	public String getName() {
		return fullPath.lastSegment();
	}

	public UniversalUniqueIdentifier getUUID() {
		return uuid;
	}

	@Override
	public boolean isReadOnly() {
		return true;
	}

	
Returns a string representation of this object. Used for debug only.
/**
	 * Returns a string representation of this object. Used for debug only.
	 */
	@Override
	public String toString() {
		StringBuilder s = new StringBuilder();
		s.append("FileState(uuid: "); //$NON-NLS-1$
		s.append(uuid.toString());
		s.append(", lastModified: "); //$NON-NLS-1$
		s.append(lastModified);
		s.append(", path: "); //$NON-NLS-1$
		s.append(fullPath);
		s.append(')');
		return s.toString();
	}
}