/*
* 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.openjpa.lib.conf;
import java.io.File;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Properties;
import java.util.TreeSet;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.exception.NestableRuntimeException;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.lib.util.Options;
import org.apache.openjpa.lib.util.ParseException;
import org.apache.openjpa.lib.util.StringDistance;
import org.apache.openjpa.lib.util.concurrent.ConcurrentHashMap;
import org.apache.openjpa.lib.util.concurrent.ConcurrentReferenceHashMap;
import serp.util.Strings;
/**
* Utility methods dealing with configuration.
*
* @author Abe White
* @nojavadoc
*/
public class Configurations {
private static final Localizer _loc = Localizer.forPackage
(Configurations.class);
private static ConcurrentReferenceHashMap _loaders = new
ConcurrentReferenceHashMap(ConcurrentReferenceHashMap.WEAK,
ConcurrentReferenceHashMap.HARD);
private static final Object NULL_LOADER = "null-loader";
/**
* Return the class name from the given plugin string, or null if none.
*/
public static String getClassName(String plugin) {
return getPluginComponent(plugin, true);
}
/**
* Return the properties part of the given plugin string, or null if none.
*/
public static String getProperties(String plugin) {
return getPluginComponent(plugin, false);
}
/**
* Return either the class name or properties string from a plugin string.
*/
private static String getPluginComponent(String plugin, boolean clsName) {
if (plugin != null)
plugin = plugin.trim();
if (StringUtils.isEmpty(plugin))
return null;
int openParen = -1;
if (plugin.charAt(plugin.length() - 1) == ')')
openParen = plugin.indexOf('(');
if (openParen == -1) {
int eq = plugin.indexOf('=');
if (eq == -1)
return (clsName) ? plugin : null;
return (clsName) ? null : plugin;
}
// clsName(props) form
if (clsName)
return plugin.substring(0, openParen).trim();
String prop = plugin.substring(openParen + 1,
plugin.length() - 1).trim();
return (prop.length() == 0) ? null : prop;
}
/**
* Combine the given class name and properties into a plugin string.
*/
public static String getPlugin(String clsName, String props) {
if (StringUtils.isEmpty(clsName))
return props;
if (StringUtils.isEmpty(props))
return clsName;
return clsName + "(" + props + ")";
}
/**
* Return a plugin string that combines the properties of the given plugin
* strings, where properties of <code>override</code> will override the
* same properties of <code>orig</code>.
*/
public static String combinePlugins(String orig, String override) {
if (StringUtils.isEmpty(orig))
return override;
if (StringUtils.isEmpty(override))
return orig;
String origCls = getClassName(orig);
String overrideCls = getClassName(override);
String cls;
if (StringUtils.isEmpty(origCls))
cls = overrideCls;
else if (StringUtils.isEmpty(overrideCls))
cls = origCls;
else if (!origCls.equals(overrideCls))
return override; // completely different plugin
else
cls = origCls;
String origProps = getProperties(orig);
String overrideProps = getProperties(override);
if (StringUtils.isEmpty(origProps))
return getPlugin(cls, overrideProps);
if (StringUtils.isEmpty(overrideProps))
return getPlugin(cls, origProps);
Properties props = parseProperties(origProps);
props.putAll(parseProperties(overrideProps));
return getPlugin(cls, serializeProperties(props));
}
/**
* Create the instance with the given class name, using the given
* class loader. No configuration of the instance is performed by
* this method.
*/
public static Object newInstance(String clsName, ClassLoader loader) {
return newInstance(clsName, null, null, loader, true);
}
/**
* Create and configure an instance with the given class name and
* properties.
*/
public static Object newInstance(String clsName, Configuration conf,
String props, ClassLoader loader) {
Object obj = newInstance(clsName, null, conf, loader, true);
configureInstance(obj, conf, props);
return obj;
}
/**
* Helper method used by members of this package to instantiate plugin
* values.
*/
static Object newInstance(String clsName, Value val, Configuration conf,
ClassLoader loader, boolean fatal) {
if (StringUtils.isEmpty(clsName))
return null;
Class cls = null;
while (cls == null) {
// can't have a null reference in the map, so use symbolic
// constant as key
Object key = loader == null ? NULL_LOADER : loader;
Map loaderCache = (Map) _loaders.get(key);
if (loaderCache == null) { // We don't have a cache for this loader.
loaderCache = new ConcurrentHashMap();
_loaders.put(key, loaderCache);
} else { // We have a cache for this loader.
cls = (Class) loaderCache.get(clsName);
}
if (cls == null) {
try {
cls = Strings.toClass(clsName, findDerivedLoader(conf,
loader));
loaderCache.put(clsName, cls);
} catch (RuntimeException re) {
if (loader != null) // Try one more time with loader=null
loader = null;
else {
if (val != null)
re = getCreateException(clsName, val, re);
if (fatal)
throw re;
Log log = (conf == null) ? null : conf
.getConfigurationLog();
if (log != null && log.isErrorEnabled())
log.error(_loc
.get("plugin-creation-exception", val), re);
return null;
}
}
}
}
try {
return AccessController.doPrivileged(
J2DoPrivHelper.newInstanceAction(cls));
} catch (Exception e) {
if (e instanceof PrivilegedActionException) {
e = ((PrivilegedActionException) e).getException();
}
RuntimeException re = new NestableRuntimeException(_loc.get
("obj-create", cls).getMessage(), e);
if (fatal)
throw re;
Log log = (conf == null) ? null : conf.getConfigurationLog();
if (log != null && log.isErrorEnabled())
log.error(_loc.get("plugin-creation-exception", val), re);
return null;
}
}
/**
* Attempt to find a derived loader that delegates to our target loader.
* This allows application loaders that delegate appropriately for known
* classes first crack at class names.
*/
private static ClassLoader findDerivedLoader(Configuration conf,
ClassLoader loader) {
// we always prefer the thread loader, because it's the only thing we
// can access that isn't bound to the OpenJPA classloader, unless
// the conf object is of a custom class
ClassLoader ctxLoader = (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getContextClassLoaderAction());
if (loader == null) {
if (ctxLoader != null)
return ctxLoader;
if (conf != null)
return (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(conf.getClass()));
return Configurations.class.getClassLoader();
}
for (ClassLoader parent = ctxLoader; parent != null;
parent = (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getParentAction(parent))) {
if (parent == loader)
return ctxLoader;
}
if (conf != null) {
for (ClassLoader parent = (ClassLoader)
AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(conf.getClass()));
parent != null;
parent = (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getParentAction(parent))) {
if (parent == loader)
return (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(conf.getClass()));
}
}
return loader;
}
/**
* Set the given {@link Configuration} instance from the command line
* options provided. All property names of the given configuration are
* recognized; additionally, if a <code>properties</code> or
* <code>p</code> argument exists, the resource it
* points to will be loaded and set into the given configuration instance.
* It can point to either a file or a resource name.
*/
public static void populateConfiguration(Configuration conf, Options opts) {
String props = opts.removeProperty("properties", "p", null);
ConfigurationProvider provider;
if (!StringUtils.isEmpty(props)) {
String path = props;
String anchor = null;
int idx = path.lastIndexOf('#');
if (idx != -1) {
if (idx < path.length() - 1)
anchor = path.substring(idx + 1);
path = path.substring(0, idx);
if (path.length() == 0)
throw new MissingResourceException(_loc.get("anchor-only",
props).getMessage(), Configurations.class.getName(),
props);
}
File file = new File(path);
if (((Boolean) AccessController.doPrivileged(J2DoPrivHelper
.isFileAction(file))).booleanValue())
provider = ProductDerivations.load(file, anchor, null);
else {
file = new File("META-INF" + File.separatorChar + path);
if (((Boolean) AccessController.doPrivileged(J2DoPrivHelper
.isFileAction(file))).booleanValue())
provider = ProductDerivations.load(file, anchor, null);
else
provider = ProductDerivations.load(path, anchor, null);
}
if (provider != null)
provider.setInto(conf);
else
throw new MissingResourceException(_loc.get("no-provider",
props).getMessage(), Configurations.class.getName(),
props);
} else {
provider = ProductDerivations.loadDefaults(null);
if (provider != null)
provider.setInto(conf);
}
opts.setInto(conf);
}
/**
* Helper method to throw an informative description on instantiation error.
*/
private static RuntimeException getCreateException(String clsName,
Value val, Exception e) {
// re-throw the exception with some better information
final String msg;
final Object[] params;
String alias = val.alias(clsName);
String[] aliases = val.getAliases();
String[] keys;
if (aliases.length == 0)
keys = aliases;
else {
keys = new String[aliases.length / 2];
for (int i = 0; i < aliases.length; i += 2)
keys[i / 2] = aliases[i];
}
String closest;
if (keys.length == 0) {
msg = "invalid-plugin";
params = new Object[]{ val.getProperty(), alias, e.toString(), };
} else if ((closest = StringDistance.getClosestLevenshteinDistance
(alias, keys, 0.5f)) == null) {
msg = "invalid-plugin-aliases";
params = new Object[]{
val.getProperty(), alias, e.toString(),
new TreeSet(Arrays.asList(keys)), };
} else {
msg = "invalid-plugin-aliases-hint";
params = new Object[]{
val.getProperty(), alias, e.toString(),
new TreeSet(Arrays.asList(keys)), closest, };
}
return new ParseException(_loc.get(msg, params), e);
}
/**
* Configures the given object with the given properties by
* matching the properties string to the object's setter
* methods. The properties string should be in the form
* "prop1=val1, prop2=val2 ...". Does not validate that setter
* methods exist for the properties.
*
* @throws RuntimeException on configuration error
*/
public static void configureInstance(Object obj, Configuration conf,
String properties) {
configureInstance(obj, conf, properties, null);
}
/**
* Configures the given object with the given properties by
* matching the properties string to the object's setter
* methods. The properties string should be in the form
* "prop1=val1, prop2=val2 ...". Validates that setter methods
* exist for the properties.
*
* @throws RuntimeException on configuration error
*/
public static void configureInstance(Object obj, Configuration conf,
String properties, String configurationName) {
if (obj == null)
return;
Properties props = null;
if (!StringUtils.isEmpty(properties))
props = parseProperties(properties);
configureInstance(obj, conf, props, configurationName);
}
/**
* Configures the given object with the given properties by
* matching the properties string to the object's setter
* methods. Does not validate that setter methods exist for the properties.
*
* @throws RuntimeException on configuration error
*/
public static void configureInstance(Object obj, Configuration conf,
Properties properties) {
configureInstance(obj, conf, properties, null);
}
/**
* Configures the given object with the given properties by
* matching the properties string to the object's setter
* methods. If <code>configurationName</code> is
* non-<code>null</code>, validates that setter methods exist for
* the properties.
*
* @throws RuntimeException on configuration error
*/
public static void configureInstance(Object obj, Configuration conf,
Properties properties, String configurationName) {
if (obj == null)
return;
Options opts;
if (properties instanceof Options)
opts = (Options) properties;
else {
opts = new Options();
if (properties != null)
opts.putAll(properties);
}
Configurable configurable = null;
if (conf != null && obj instanceof Configurable)
configurable = (Configurable) obj;
if (configurable != null) {
configurable.setConfiguration(conf);
configurable.startConfiguration();
}
Options invalidEntries = opts.setInto(obj);
if (obj instanceof GenericConfigurable)
((GenericConfigurable) obj).setInto(invalidEntries);
if (!invalidEntries.isEmpty() && configurationName != null) {
Localizer.Message msg = null;
String first = (String) invalidEntries.keySet().iterator().next();
if (invalidEntries.keySet().size() == 1 &&
first.indexOf('.') == -1) {
// if there's just one misspelling and this is not a
// path traversal, check for near misses.
Collection options = findOptionsFor(obj.getClass());
String close = StringDistance.getClosestLevenshteinDistance
(first, options, 0.75f);
if (close != null)
msg = _loc.get("invalid-config-param-hint", new Object[]{
configurationName, obj.getClass(), first, close,
options, });
}
if (msg == null) {
msg = _loc.get("invalid-config-params", new String[]{
configurationName, obj.getClass().getName(),
invalidEntries.keySet().toString(),
findOptionsFor(obj.getClass()).toString(), });
}
throw new ParseException(msg);
}
if (configurable != null)
configurable.endConfiguration();
}
private static Collection findOptionsFor(Class cls) {
Collection c = Options.findOptionsFor(cls);
// remove Configurable.setConfiguration() and
// GenericConfigurable.setInto() from the set, if applicable.
if (Configurable.class.isAssignableFrom(cls))
c.remove("Configuration");
if (GenericConfigurable.class.isAssignableFrom(cls))
c.remove("Into");
return c;
}
/**
* Turn a set of properties into a comma-separated string.
*/
public static String serializeProperties(Map map) {
if (map == null || map.isEmpty())
return null;
StringBuffer buf = new StringBuffer();
Map.Entry entry;
String val;
for (Iterator itr = map.entrySet().iterator(); itr.hasNext();) {
entry = (Map.Entry) itr.next();
if (buf.length() > 0)
buf.append(", ");
buf.append(entry.getKey()).append('=');
val = String.valueOf(entry.getValue());
if (val.indexOf(',') != -1)
buf.append('"').append(val).append('"');
else
buf.append(val);
}
return buf.toString();
}
/**
* Parse a set of properties from a comma-separated string.
*/
public static Options parseProperties(String properties) {
Options opts = new Options();
properties = StringUtils.trimToNull(properties);
if (properties == null)
return opts;
try {
String[] props = Strings.split(properties, ",", 0);
int idx;
char quote;
String prop;
String val;
for (int i = 0; i < props.length; i++) {
idx = props[i].indexOf('=');
if (idx == -1) {
// if the key is not assigned to any value, set the
// value to the same thing as the key, and continue.
// This permits GenericConfigurable instances to
// behave meaningfully. We might consider setting the
// value to some well-known "value was not set, but
// key is present" string so that instances getting
// values injected can differentiate between a mentioned
// property and one set to a particular value.
prop = props[i];
val = prop;
} else {
prop = props[i].substring(0, idx).trim();
val = props[i].substring(idx + 1).trim();
}
// if the value is quoted, read until the end quote
if (((val.startsWith("\"") && val.endsWith("\""))
|| (val.startsWith("'") && val.endsWith("'")))
&& val.length() > 1)
val = val.substring(1, val.length() - 1);
else if (val.startsWith("\"") || val.startsWith("'")) {
quote = val.charAt(0);
StringBuffer buf = new StringBuffer(val.substring(1));
int quotIdx;
while (++i < props.length) {
buf.append(",");
quotIdx = props[i].indexOf(quote);
if (quotIdx != -1) {
buf.append(props[i].substring(0, quotIdx));
if (quotIdx + 1 < props[i].length())
buf.append(props[i].substring(quotIdx + 1));
break;
} else
buf.append(props[i]);
}
val = buf.toString();
}
opts.put(prop, val);
}
return opts;
} catch (RuntimeException re) {
throw new ParseException(_loc.get("prop-parse", properties), re);
}
}
/**
* Looks up the given name in JNDI. If the name is null, null is returned.
*/
public static Object lookup(String name) {
if (StringUtils.isEmpty(name))
return null;
Context ctx = null;
try {
ctx = new InitialContext();
return ctx.lookup(name);
} catch (NamingException ne) {
throw new NestableRuntimeException(
_loc.get("naming-err", name).getMessage(), ne);
} finally {
if (ctx != null)
try { ctx.close(); } catch (Exception e) {}
}
}
/**
* Test whether the map contains the given partial key, prefixed with any
* possible configuration prefix.
*/
public static boolean containsProperty(String partialKey, Map props) {
if (partialKey == null || props == null || props.isEmpty())
return false;
else
return props.containsKey(
ProductDerivations.getConfigurationKey(partialKey, props));
}
/**
* Get the property under the given partial key, prefixed with any possible
* configuration prefix.
*/
public static Object getProperty(String partialKey, Map m) {
if (partialKey == null || m == null || m.isEmpty())
return null;
else
return m.get(ProductDerivations.getConfigurationKey(partialKey, m));
}
/**
* Remove the property under the given partial key, prefixed with any
* possible configuration prefix.
*/
public static Object removeProperty(String partialKey, Map props) {
if (partialKey == null || props == null || props.isEmpty())
return null;
return props.remove(ProductDerivations.getConfigurationKey(partialKey,
props));
}
}