org.eclipse.osgi.storage.PermissionData Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2003, 2016 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
*******************************************************************************/
package org.eclipse.osgi.storage;
import java.io.*;
import java.util.*;
/**
* Permission Storage interface for managing a persistent storage of
* bundle permissions.
*
* This class is used to provide methods to manage
* persistent storage of bundle permissions.
*/
public class PermissionData {
private static final int PERMDATA_VERSION = 1;
private final Map locations = new HashMap<>();
private String[] defaultInfos;
private String[] condPermInfos;
private boolean dirty;
/**
* Returns the locations that have permission data assigned to them,
* that is, locations for which permission data
* exists in persistent storage.
*
* @return The locations that have permission data in
* persistent storage, or null if there is no permission data
* in persistent storage.
*/
public String[] getLocations() {
synchronized (locations) {
String[] result = new String[locations.size()];
int i = 0;
for (Iterator iLocs = locations.keySet().iterator(); iLocs.hasNext(); i++)
result[i] = iLocs.next();
return result;
}
}
/**
* Gets the permission data assigned to the specified
* location.
*
* @param location The location whose permission data is to
* be returned.
* The location can be null for the default permission data.
*
* @return The permission data assigned to the specified
* location, or null if that location has not been assigned any
* permission data.
*/
public String[] getPermissionData(String location) {
if (location == null)
return defaultInfos;
synchronized (locations) {
if (locations.size() == 0)
return null;
return locations.get(location);
}
}
/**
* Assigns the specified permission data to the specified
* location.
*
* @param location The location that will be assigned the
* permissions.
* The location can be null for the default permission data.
* @param data The permission data to be assigned, or null
* if the specified location is to be removed from persistent storaqe.
*/
public void setPermissionData(String location, String[] data) {
if (location == null) {
defaultInfos = data;
return;
}
synchronized (locations) {
if (data == null)
locations.remove(location);
else
locations.put(location, data);
}
setDirty(true);
}
/**
* Persists the array of encoded ConditionalPermissionInfo strings
* @param infos an array of encoded ConditionalPermissionInfo strings
*/
public void saveConditionalPermissionInfos(String[] infos) {
condPermInfos = infos;
setDirty(true);
}
/**
* Returns the persistent array of encoded ConditionalPermissionInfo strings
* @return an array of encoded ConditionalPermissionInfo strings or null
* if none exist in persistent storage.
*/
public String[] getConditionalPermissionInfos() {
return condPermInfos;
}
boolean isDirty() {
return dirty;
}
private void setDirty(boolean dirty) {
this.dirty = dirty;
}
void readPermissionData(DataInputStream in) throws IOException {
int version = in.readInt();
int dataSize = in.readInt();
byte[] bytes = new byte[dataSize];
in.readFully(bytes);
if (PERMDATA_VERSION == version) {
DataInputStream temp = new DataInputStream(new ByteArrayInputStream(bytes));
try {
// read the default permissions first
int numPerms = temp.readInt();
if (numPerms > 0) {
String[] perms = new String[numPerms];
for (int i = 0; i < numPerms; i++)
perms[i] = temp.readUTF();
setPermissionData(null, perms);
}
int numLocs = temp.readInt();
if (numLocs > 0) {
for (int i = 0; i < numLocs; i++) {
String loc = temp.readUTF();
numPerms = temp.readInt();
String[] perms = new String[numPerms];
for (int j = 0; j < numPerms; j++)
perms[j] = temp.readUTF();
setPermissionData(loc, perms);
}
}
int numCondPerms = temp.readInt();
if (numCondPerms > 0) {
String[] condPerms = new String[numCondPerms];
for (int i = 0; i < numCondPerms; i++) {
condPerms[i] = temp.readUTF();
}
saveConditionalPermissionInfos(condPerms);
}
} finally {
setDirty(false);
temp.close();
}
}
}
void savePermissionData(DataOutputStream out) throws IOException {
out.writeInt(PERMDATA_VERSION);
// create a temporary in memory stream so we can figure out the length
ByteArrayOutputStream tempBytes = new ByteArrayOutputStream();
DataOutputStream temp = new DataOutputStream(tempBytes);
// always write the default permissions first
String[] defaultPerms = getPermissionData(null);
temp.writeInt(defaultPerms == null ? 0 : defaultPerms.length);
if (defaultPerms != null)
for (String defaultPerm : defaultPerms) {
temp.writeUTF(defaultPerm);
}
String[] locs = getLocations();
temp.writeInt(locs == null ? 0 : locs.length);
if (locs != null)
for (String loc : locs) {
temp.writeUTF(loc);
String[] perms = getPermissionData(loc);
temp.writeInt(perms == null ? 0 : perms.length);
if (perms != null) {
for (String perm : perms) {
temp.writeUTF(perm);
}
}
}
String[] condPerms = getConditionalPermissionInfos();
temp.writeInt(condPerms == null ? 0 : condPerms.length);
if (condPerms != null)
for (String condPerm : condPerms) {
temp.writeUTF(condPerm);
}
temp.close();
out.writeInt(tempBytes.size());
out.write(tempBytes.toByteArray());
setDirty(false);
}
}