The HSQLDB DINameSpace.java source code
/* Copyright (c) 2001-2008, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package org.hsqldb;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.hsqldb.lib.HashMap;
import org.hsqldb.lib.HashSet;
import org.hsqldb.lib.HsqlArrayList;
import org.hsqldb.lib.Iterator;
import org.hsqldb.lib.WrapperIterator;
// boucherb@users - 2004xxxx - patch 1.7.2
// -- canonical database uri for catalog name reporting
// -- enumXXX methods to iterateXXX
// -- simple support for SEQUENCE schema reporting
// -- report built-in procedures/procedure columns without dependency on user grants;
/**
* Provides catalog and schema related definitions and functionality. <p>
*
* Additional features include accessibility tests, class loading, filtered
* iteration and inverted alias mapping functionality regarding Java Classes
* and Methods defined within the context of this database name space support
* object. <p>
*
* @author boucherb@users
* @version 1.8.0
* @since 1.7.2
*/
final class DINameSpace {
/** The Database for which the name space functionality is provided */
private Database database;
/** The catalog name reported by this namespace */
private String catalogName;
/**
* Set { <code>Class FQN String objects }.
*
* The Set contains the names of the classes providing the public static
* methods that are automatically made accessible to the PUBLIC user in
* support of the expected SQL CLI scalar functions and other core
* HSQLDB SQL functions and stored procedures. <p>
*/
private static HashSet builtin = new HashSet();
// procedure columns
// make temporary ad-hoc spec a little more "official"
// until better system in place
static {
builtin.add("org.hsqldb.Library");
builtin.add("java.lang.Math");
}
/**
* Constructs a new name space support object for the
* specified Database object. <p>
*
* @param database The Database object for which to provide name
* space support
* @throws HsqlException if a database access error occurs
*/
public DINameSpace(Database database) throws HsqlException {
try {
this.database = database;
this.catalogName = database.getURI();
} catch (Exception e) {
Trace.throwerror(Trace.GENERAL_ERROR, e.toString());
}
}
/**
* Retrieves the declaring <code>Class object for the specified
* fully qualified method name, using (if possible) the classLoader
* attribute of this object's database. <p>
*
* @param fqn the fully qualified name of the method for which to
* retrieve the declaring <code>Class object.
* @return the declaring <code>Class object for the
* specified fully qualified method name
*/
Class classForMethodFQN(String fqn) {
try {
return classForName(fqn.substring(0, fqn.lastIndexOf('.')));
} catch (Exception e) {
return null;
}
}
/**
* Retrieves the <code>Class object specified by the
* <code>name argument, using, if possible, the
* classLoader attribute of the database. <p>
*
* @param name the fully qualified name of the <code>Class
* object to retrieve.
* @throws ClassNotFoundException if the specified class object
* cannot be found in the context of this name space
* @return the <code>Class object specified by the
* <code>name argument
*/
Class classForName(String name) throws ClassNotFoundException {
try {
if (database.classLoader == null) {
return Class.forName(name);
} else {
if (name != null) {
return database.classLoader.loadClass(name);
} else {
throw new ClassNotFoundException();
}
}
} catch (NoClassDefFoundError err) {
throw new ClassNotFoundException(err.toString());
}
}
/**
* Retrieves an <code>Iterator whose elements form the set of
* distinct names of all visible catalogs, relative to this object's
* database. <p>
*
* If catalog reporting is turned off, then the empty Iterator is
* returned. <p>
*
* <b>Note: in the present implementation, if catalog reporting is
* turned on, then the iteration consists of a single element that is the
* uri of this object's database; HSQLDB currently does not support the
* concept a single engine hosting multiple catalogs. <p>
*
* @return An Iterator whose elements are <code>String objects
* naming all visible catalogs, relative to this object's database.
* @throws HsqlException never (reserved for future use)
*/
Iterator iterateCatalogNames() throws HsqlException {
return isReportCatalogs() ? new WrapperIterator(catalogName)
: new WrapperIterator();
}
/**
* Retrieves the name of the catalog corresponding to the indicated
* object. <p>
*
* <B>Note: the uri of this object's database is returned whenever
* catalog reporting is turned on. <p>
*
* This a stub that will be used until such time (if ever) that the
* engine actually supports the concept of multiple hosted
* catalogs. <p>
*
* @return the name of specified object's qualifying catalog, or null if
* catalog reporting is turned off.
* @param o the object for which the name of its qualifying catalog
* is to be retrieved
*/
String getCatalogName(Object o) {
return isReportCatalogs() ? catalogName
: null;
}
/**
* Retrieves a map from each distinct value of this object's database
* SQL routine CALL alias map to the list of keys in the input map
* mapping to that value. <p>
*
* @return The requested map
*/
HashMap getInverseAliasMap() {
HashMap mapIn;
HashMap mapOut;
Iterator keys;
Object key;
Object value;
HsqlArrayList keyList;
// TODO:
// update Database to dynamically maintain its own
// inverse alias map. This will make things *much*
// faster for our purposes here, without appreciably
// slowing down Database
mapIn = database.getAliasMap();
mapOut = new HashMap();
keys = mapIn.keySet().iterator();
while (keys.hasNext()) {
key = keys.next();
value = mapIn.get(key);
keyList = (HsqlArrayList) mapOut.get(value);
if (keyList == null) {
keyList = new HsqlArrayList();
mapOut.put(value, keyList);
}
keyList.add(key);
}
return mapOut;
}
/**
* Retrieves the fully qualified name of the given Method object. <p>
*
* @param m The Method object for which to retreive the fully
* qualified name
* @return the fully qualified name of the specified Method object.
*/
static String getMethodFQN(Method m) {
return m == null ? null
: m.getDeclaringClass().getName() + '.'
+ m.getName();
}
/**
* Retrieves the specific name of the given Method object. <p>
*
* @param m The Method object for which to retreive the specific name
* @return the specific name of the specified Method object.
*/
static String getMethodSpecificName(Method m) {
return m == null ? null
: m.getDeclaringClass().getName() + '.'
+ getSignature(m);
}
static String getSignature(Method method) {
StringBuffer sb;
String signature;
Class[] parmTypes;
int len;
int last;
sb = new StringBuffer();
parmTypes = method.getParameterTypes();
len = parmTypes.length;
last = len - 1;
sb.append(method.getName()).append('(');
for (int i = 0; i < len; i++) {
sb.append(parmTypes[i].getName());
if (i < last) {
sb.append(',');
}
}
sb.append(')');
signature = sb.toString();
return signature;
}
/**
* Deprecated
*/
String getSchemaName(Object o) {
return database.schemaManager.PUBLIC_SCHEMA;
}
/**
* Adds to the given Set the fully qualified names of the Class objects
* internally granted to PUBLIC in support of core operation.
*
* @param the HashSet to which to add the fully qualified names of
* the Class objects internally granted to PUBLIC in support of
* core operation.
*/
void addBuiltinToSet(HashSet set) {
set.addAll(builtin.toArray(new String[builtin.size()]));
}
/**
* Retrieves whether the indicated Class object is systematically
* granted to PUBLIC in support of core operation. <p>
*
* @return whether the indicated Class object is systematically
* granted to PUBLIC in support of core operation
* @param clazz The Class object for which to make the determination
*/
boolean isBuiltin(Class clazz) {
return clazz == null ? false
: builtin.contains(clazz.getName());
}
/**
* Retrieves whether the Class object indicated by the fully qualified
* class name is systematically granted to PUBLIC in support of
* core operation. <p>
*
* @return true if system makes grant, else false
* @param name fully qualified name of a Class
*/
boolean isBuiltin(String name) {
return (name == null) ? false
: builtin.contains(name);
}
/**
* Retrieves an <code>Iterator object describing the Java
* <code>Method objects that are both the entry points
* to executable SQL database objects (such as SQL functions and
* stored procedures) within the context of this name space. <p>
*
* Each element of the <code>Iterator is an Object[3] array
* whose elements are: <p>
*
* <ol>
* <li>a Method object.
* <li>an HsqlArrayList object whose elements are the SQL call
* aliases for the method.
* <li>the String "ROUTINE"
* </ol>
*
* <b>Note: Admin users are actually free to invoke *any* public
* static non-abstract Java Method that can be found through the database
* class loading process, either as a SQL stored procedure or SQL function,
* as long as its parameters and return type are compatible with the
* engine's supported SQL type / Java <code>Class mappings.
*
* @return An <code>Iterator object whose elements form the set
* of distinct <code>Method objects accessible as
* executable as SQL routines within the current execution
* context.<p>
*
* Elements are <code>Object[3] instances, with [0] being a
* <code>Method object, [1] being an alias list object and
* [2] being the <code>String "ROUTINE"
*
* If the <code>Method object at index [0] has aliases,
* and the <code>andAliases parameter is specified
* as <code>true, then there is an HsqlArrayList
* at index [1] whose elements are <code>String objects
* whose values are the SQL call aliases for the method.
* Otherwise, the value of index [1] is <code>null.
* @param className The fully qualified name of the class for which to
* retrieve the iteration
* @param andAliases if <code>true, alias lists for qualifying
* methods are additionally retrieved.
* @throws HsqlException if a database access error occurs
*
*/
Iterator iterateRoutineMethods(String className,
boolean andAliases) throws HsqlException {
Class clazz;
Method[] methods;
Method method;
int mods;
Object[] info;
HsqlArrayList aliasList;
HsqlArrayList methodList;
HashMap invAliasMap;
try {
clazz = classForName(className);
} catch (ClassNotFoundException e) {
return new WrapperIterator();
}
invAliasMap = andAliases ? getInverseAliasMap()
: null;
// we are interested in inherited methods too,
// so we use getDeclaredMethods() first.
// However, under Applet execution or
// under restrictive SecurityManager policies
// this may fail, so we use getMethods()
// if getDeclaredMethods() fails.
try {
methods = clazz.getDeclaredMethods();
} catch (Exception e) {
methods = clazz.getMethods();
}
methodList = new HsqlArrayList(methods.length);
// add all public static methods to the set
for (int i = 0; i < methods.length; i++) {
method = methods[i];
mods = method.getModifiers();
if (!(Modifier.isPublic(mods) && Modifier.isStatic(mods))) {
continue;
}
info = new Object[] {
method, null, "ROUTINE"
};
if (andAliases) {
info[1] = invAliasMap.get(getMethodFQN(method));
}
methodList.add(info);
}
// return the iterator
return methodList.iterator();
}
/**
* Retrieves an <code>Iterator object describing the
* fully qualified names of all Java <code>Class objects
* that are both trigger body implementations and that are accessible
* (whose fire method can potentially be invoked) by actions upon this
* object's database by the specified <code>User.
*
* @param user the <code>User for which to retrieve the
* <code>Iterator
* @throws HsqlException if a database access error occurs
* @return an <code>Iterator object describing the
* fully qualified names of all Java <code>Class
* objects that are both trigger body implementations
* and that are accessible (whose fire method can
* potentially be invoked) by actions upon this object's database
* by the specified <code>User.
*/
Iterator iterateAccessibleTriggerClassNames(User user)
throws HsqlException {
Table table;
Class clazz;
HashSet classSet;
TriggerDef triggerDef;
HsqlArrayList[] triggerLists;
HsqlArrayList triggerList;
HsqlArrayList tableList;
int listSize;
classSet = new HashSet();
Iterator schemas = database.schemaManager.userSchemaNameIterator();
while (schemas.hasNext()) {
String schema = (String) schemas.next();
Iterator tables = database.schemaManager.tablesIterator(schema);
while (tables.hasNext()) {
table = (Table) tables.next();
if (!user.isAccessible(table.getName())) {
continue;
}
triggerLists = table.triggerLists;
if (triggerLists == null) {
continue;
}
for (int j = 0; j < triggerLists.length; j++) {
triggerList = triggerLists[j];
if (triggerList == null) {
continue;
}
listSize = triggerList.size();
for (int k = 0; k < listSize; k++) {
triggerDef = (TriggerDef) triggerList.get(k);
if (triggerDef == null ||!triggerDef.valid
|| triggerDef.trigger == null
||!user.isAccessible(
table.getName(),
TriggerDef.indexToRight(k))) {
continue;
}
classSet.add(triggerDef.trigger.getClass().getName());
}
}
}
}
return classSet.iterator();
}
/**
* Retrieves a composite <code>Iterator consisting of the elements
* from {@link #iterateRoutineMethods} for each Class granted to the
* specified session. <p>
*
* @return a composite <code>Iterator consisting of the elements
* from {@link #iterateRoutineMethods} and
* {@link #iterateAccessibleTriggerMethods}
* @param session The context in which to produce the iterator
* @param andAliases true if the alias lists for the "ROUTINE" type method
* elements are to be generated.
* @throws HsqlException if a database access error occurs
*/
Iterator iterateAllAccessibleMethods(Session session,
boolean andAliases)
throws HsqlException {
Iterator out;
HashSet classNameSet;
Iterator classNames;
Iterator methods;
String className;
out = new WrapperIterator();
classNameSet = session.getUser().getGrantedClassNames(true);
addBuiltinToSet(classNameSet);
classNames = classNameSet.iterator();
while (classNames.hasNext()) {
className = (String) classNames.next();
methods = iterateRoutineMethods(className, andAliases);
out = new WrapperIterator(out, methods);
}
return out;
}
/**
* Retrieves the set of distinct, visible sessions connected to this
* object's database, as a list. <p>
*
* @param session The context in which to produce the list
* @return the set of distinct, visible sessions connected
* to this object's database, as a list.
*/
Session[] listVisibleSessions(Session session) {
return database.sessionManager.getVisibleSessions(session);
}
/**
* Retrieves whether this object is reporting catalog qualifiers.
* @return true if this object is reporting catalog qualifiers, else false.
*/
boolean isReportCatalogs() {
return database.getProperties().isPropertyTrue("hsqldb.catalogs");
}
}
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