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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.xml.security.c14n.implementations;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.w3c.dom.Attr;
import org.w3c.dom.Node;
/**
* A stack based Symbol Table.
* For speed reasons all the symbols are introduced in the same map,
* and at the same time in a list so it can be removed when the frame is pop back.
*/
public class NameSpaceSymbTable {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(NameSpaceSymbTable.class);
private static final String XMLNS = "xmlns";
private static final SymbMap initialMap = new SymbMap();
static {
NameSpaceSymbEntry ne = new NameSpaceSymbEntry("", null, true, XMLNS);
ne.lastrendered = "";
initialMap.put(XMLNS, ne);
}
/**The map between prefix-> entry table. */
private SymbMap symb;
/**The stacks for removing the definitions when doing pop.*/
private final List level = new ArrayList<>();
private boolean cloned = true;
/**
* Default constructor
**/
public NameSpaceSymbTable() {
//Insert the default binding for xmlns.
try {
symb = initialMap.clone();
} catch (CloneNotSupportedException e) {
LOG.error("Error cloning the initial map");
}
}
/**
* Get all the unrendered nodes in the name space.
* For Inclusive rendering
* @param result the list where to fill the unrendered xmlns definitions.
**/
public void getUnrenderedNodes(Collection result) {
for (NameSpaceSymbEntry nsEntry : symb.entrySet()) {
//put them rendered?
if (!nsEntry.rendered && nsEntry.n != null) {
nsEntry = nsEntry.clone();
needsClone();
symb.put(nsEntry.prefix, nsEntry);
nsEntry.lastrendered = nsEntry.uri;
nsEntry.rendered = true;
result.add(nsEntry.n);
}
}
}
/**
* Push a frame for visible namespace.
* For Inclusive rendering.
**/
public void outputNodePush() {
push();
}
/**
* Pop a frame for visible namespace.
**/
public void outputNodePop() {
pop();
}
/**
* Push a frame for a node.
* Inclusive or Exclusive.
**/
public void push() {
//Put the number of namespace definitions in the stack.
level.add(null);
cloned = false;
}
/**
* Pop a frame.
* Inclusive or Exclusive.
**/
public void pop() {
int size = level.size() - 1;
Object ob = level.remove(size);
if (ob != null) {
symb = (SymbMap)ob;
if (size == 0) {
cloned = false;
} else {
cloned = level.get(size - 1) != symb;
}
} else {
cloned = false;
}
}
final void needsClone() {
if (!cloned) {
level.set(level.size() - 1, symb);
try {
symb = symb.clone();
} catch (CloneNotSupportedException e) {
LOG.error("Error cloning the symbol map");
}
cloned = true;
}
}
/**
* Gets the attribute node that defines the binding for the prefix.
* @param prefix the prefix to obtain the attribute.
* @return null if there is no need to render the prefix. Otherwise the node of
* definition.
**/
public Attr getMapping(String prefix) {
NameSpaceSymbEntry entry = symb.get(prefix);
if (entry == null) {
//There is no definition for the prefix(a bug?).
return null;
}
if (entry.rendered) {
//No need to render an entry already rendered.
return null;
}
// Mark this entry as render.
entry = entry.clone();
needsClone();
symb.put(prefix, entry);
entry.rendered = true;
entry.lastrendered = entry.uri;
// Return the node for outputting.
return entry.n;
}
/**
* Gets a definition without mark it as render.
* For render in exclusive c14n the namespaces in the include prefixes.
* @param prefix The prefix whose definition is needed.
* @return the attr to render, null if there is no need to render
**/
public Attr getMappingWithoutRendered(String prefix) {
NameSpaceSymbEntry entry = symb.get(prefix);
if (entry == null) {
return null;
}
if (entry.rendered) {
return null;
}
return entry.n;
}
/**
* Adds the mapping for a prefix.
* @param prefix the prefix of definition
* @param uri the Uri of the definition
* @param n the attribute that have the definition
* @return true if there is already defined.
**/
public boolean addMapping(String prefix, String uri, Attr n) {
NameSpaceSymbEntry ob = symb.get(prefix);
if (ob != null && uri.equals(ob.uri)) {
//If we have it previously defined. Don't keep working.
return false;
}
//Creates and entry in the table for this new definition.
NameSpaceSymbEntry ne = new NameSpaceSymbEntry(uri, n, false, prefix);
needsClone();
symb.put(prefix, ne);
if (ob != null) {
//We have a previous definition store it for the pop.
//Check if a previous definition(not the inmidiatly one) has been rendered.
ne.lastrendered = ob.lastrendered;
if (ob.lastrendered != null && ob.lastrendered.equals(uri)) {
//Yes it is. Mark as rendered.
ne.rendered = true;
}
}
return true;
}
/**
* Adds a definition and mark it as render.
* For inclusive c14n.
* @param prefix the prefix of definition
* @param uri the Uri of the definition
* @param n the attribute that have the definition
* @return the attr to render, null if there is no need to render
**/
public Node addMappingAndRender(String prefix, String uri, Attr n) {
NameSpaceSymbEntry ob = symb.get(prefix);
if (ob != null && uri.equals(ob.uri)) {
if (!ob.rendered) {
ob = ob.clone();
needsClone();
symb.put(prefix, ob);
ob.lastrendered = uri;
ob.rendered = true;
return ob.n;
}
return null;
}
NameSpaceSymbEntry ne = new NameSpaceSymbEntry(uri, n, true, prefix);
ne.lastrendered = uri;
needsClone();
symb.put(prefix, ne);
if (ob != null && ob.lastrendered != null && ob.lastrendered.equals(uri)) {
ne.rendered = true;
return null;
}
return ne.n;
}
public int getLevel() {
return level.size();
}
public void removeMapping(String prefix) {
NameSpaceSymbEntry ob = symb.get(prefix);
if (ob != null) {
needsClone();
symb.put(prefix, null);
}
}
public void removeMappingIfNotRender(String prefix) {
NameSpaceSymbEntry ob = symb.get(prefix);
if (ob != null && !ob.rendered) {
needsClone();
symb.put(prefix, null);
}
}
public boolean removeMappingIfRender(String prefix) {
NameSpaceSymbEntry ob = symb.get(prefix);
if (ob != null && ob.rendered) {
needsClone();
symb.put(prefix, null);
}
return false;
}
}
/**
* The internal structure of NameSpaceSymbTable.
**/
class NameSpaceSymbEntry implements Cloneable {
final String prefix;
/**The URI that the prefix defines */
final String uri;
/**The attribute to include.*/
final Attr n;
/**The last output in the URI for this prefix (This for speed reason).*/
String lastrendered = null;
/**This prefix-URI has been already render or not.*/
boolean rendered = false;
NameSpaceSymbEntry(String name, Attr n, boolean rendered, String prefix) {
this.uri = name;
this.rendered = rendered;
this.n = n;
this.prefix = prefix;
}
/** {@inheritDoc} */
@Override
public NameSpaceSymbEntry clone() { //NOPMD
try {
return (NameSpaceSymbEntry)super.clone();
} catch (CloneNotSupportedException e) {
return null;
}
}
}
class SymbMap implements Cloneable {
int free = 23;
NameSpaceSymbEntry[] entries;
String[] keys;
SymbMap() {
entries = new NameSpaceSymbEntry[free];
keys = new String[free];
}
void put(String key, NameSpaceSymbEntry value) {
int index = index(key);
Object oldKey = keys[index];
keys[index] = key;
entries[index] = value;
if ((oldKey == null || !oldKey.equals(key)) && --free == 0) {
free = entries.length;
int newCapacity = free << 2;
rehash(newCapacity);
}
}
List entrySet() {
List a = new ArrayList<>();
for (NameSpaceSymbEntry nsEntry : entries) {
if (nsEntry != null && !nsEntry.uri.isEmpty()) {
a.add(nsEntry);
}
}
return a;
}
protected int index(Object obj) {
Object[] set = keys;
int length = set.length;
//abs of index
int index = (obj.hashCode() & 0x7fffffff) % length;
Object cur = set[index];
if (cur == null || cur.equals(obj)) {
return index;
}
length--;
do {
index = index == length ? 0 : ++index;
cur = set[index];
} while (cur != null && !cur.equals(obj));
return index;
}
/**
* rehashes the map to the new capacity.
*
* @param newCapacity an int value
*/
protected void rehash(int newCapacity) {
int oldCapacity = keys.length;
String[] oldKeys = keys;
NameSpaceSymbEntry oldVals[] = entries;
keys = new String[newCapacity];
entries = new NameSpaceSymbEntry[newCapacity];
for (int i = oldCapacity; i-- > 0;) {
if (oldKeys[i] != null) {
String o = oldKeys[i];
int index = index(o);
keys[index] = o;
entries[index] = oldVals[i];
}
}
}
NameSpaceSymbEntry get(String key) {
return entries[index(key)];
}
@Override
public SymbMap clone() throws CloneNotSupportedException {
SymbMap copy = (SymbMap) super.clone();
copy.entries = new NameSpaceSymbEntry[entries.length];
System.arraycopy(entries, 0, copy.entries, 0, entries.length);
copy.keys = new String[keys.length];
System.arraycopy(keys, 0, copy.keys, 0, keys.length);
return copy;
}
}
