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/*******************************************************************************
 * Copyright (c) 2009, 2011 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
 ******************************************************************************/
package org.eclipse.equinox.log;

import java.security.Permission;
import java.security.PermissionCollection;

/**
 * Indicates a bundle's authority to log on behalf of other bundles.
 * 
 * This permission has only a single action: LOG.
 * 
 * @ThreadSafe
 * @since 3.7
 */
public class LogPermission extends Permission {
	private static final long serialVersionUID = -441193976837153362L;
	private static final String ALL = "*"; //$NON-NLS-1$

	/**
	 * The action string log.
	 */
	public static final String LOG = "log"; //$NON-NLS-1$

	/**
	 * Create a new LogPermission.
	 * 
	 * @param name Name must be "*".
	 * @param actions log or "*".
	 */
	public LogPermission(String name, String actions) {
		super(name);
		if (!name.equals(ALL))
			throw new IllegalArgumentException("name must be *"); //$NON-NLS-1$

		actions = actions.trim();
		if (!actions.equalsIgnoreCase(LOG) && !actions.equals(ALL))
			throw new IllegalArgumentException("actions must be * or log"); //$NON-NLS-1$
	}

	public boolean equals(Object obj) {
		return obj instanceof LogPermission;
	}

	public String getActions() {
		return LOG;
	}

	public int hashCode() {
		return LogPermission.class.hashCode();
	}

	public boolean implies(Permission permission) {
		return permission instanceof LogPermission;
	}

	public PermissionCollection newPermissionCollection() {
		return new LogPermissionCollection();
	}
}