133 lines
4.2 KiB
Java
133 lines
4.2 KiB
Java
/* ProtectionDomain.java -- A security domain
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.security;
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/**
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* This class represents a group of classes, along with the permissions
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* they are granted. The classes are identified by a <code>CodeSource</code>.
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* Thus, any class loaded from the specified <code>CodeSource</code> is
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* treated as part of this domain. The set of permissions is represented
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* by a <code>PermissionCollection</code>.
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* <p>
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* Every class in the system will belong to one and only one
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* <code>ProtectionDomain</code>.
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*
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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class ProtectionDomain
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{
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private static final String linesep = System.getProperty("line.separator");
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/**
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* This is the <code>CodeSource</code> for this protection domain
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*/
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private CodeSource code_source;
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/**
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* This is the set of permissions granted to this domain
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*/
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private PermissionCollection perms;
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/**
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* This method initializes a new instance of <code>ProtectionDomain</code>
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* representing the specified <code>CodeSource</code> and permission set.
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* No permissions may be added to the <code>PermissionCollection</code>
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* and this contructor will call the <code>setReadOnly</code> method on
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* the specified permission set.
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*
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* @param code_source The <code>CodeSource</code> for this domain
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* @param perms The permission set for this domain
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*
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* @see java.security.PermissionCollection#setReadOnly()
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*/
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public ProtectionDomain(CodeSource code_source, PermissionCollection perms)
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{
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this.code_source = code_source;
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this.perms = perms;
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if (perms != null)
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perms.setReadOnly();
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}
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/**
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* This method returns the <code>CodeSource</code> for this domain.
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*
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* @return This domain's <code>CodeSource</code>.
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*/
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public final CodeSource getCodeSource()
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{
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return code_source;
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}
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/**
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* This method returns the set of permissions granted to this domain.
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*
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* @return The permission set for this domain
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*/
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public final PermissionCollection getPermissions()
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{
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return perms;
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}
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/**
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* This method tests whether or not the specified <code>Permission</code> is
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* implied by the set of permissions granted to this domain.
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*
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* @param perm The <code>Permission</code> to test.
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*
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* @return <code>true</code> if the specified <code>Permission</code> is implied for this domain, <code>false</code> otherwise.
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*/
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public boolean implies(Permission perm)
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{
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PermissionCollection pc = getPermissions();
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if (pc == null)
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return (false);
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return (pc.implies(perm));
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}
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/**
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* This method returns a <code>String</code> representation of this
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* object. It will print the <code>CodeSource</code> and
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* permission set associated with this domain.
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*
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* @return A <code>String</code> representation of this object.
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*/
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public String toString()
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{
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StringBuffer sb = new StringBuffer("");
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sb.append(super.toString() + " (" + linesep);
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sb.append(code_source.toString());
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sb.append(perms.toString());
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sb.append(")" + linesep);
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return sb.toString();
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}
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}
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