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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.openjpa.meta;
import java.io.File;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import org.apache.commons.lang.StringUtils;
import org.apache.openjpa.conf.SeqValue;
import org.apache.openjpa.kernel.Seq;
import org.apache.openjpa.lib.conf.Configurations;
import org.apache.openjpa.lib.conf.PluginValue;
import org.apache.openjpa.lib.meta.SourceTracker;
import org.apache.openjpa.lib.util.Closeable;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.lib.xml.Commentable;
import org.apache.openjpa.util.MetaDataException;
import org.apache.openjpa.util.OpenJPAException;
/**
* Metadata about a named sequence.
*
* @author Abe White
* @since 0.4.0
*/
public class SequenceMetaData
implements SourceTracker, MetaDataContext, Closeable, Commentable,
Serializable {
/**
* Sequence name that means to use the system default sequence.
*/
public static final String NAME_SYSTEM = "system";
/**
* Default plugin alias name; every back end should have some 'native'
* sequence implementation.
*/
public static final String IMPL_NATIVE = "native";
/**
* Time-based sequence values.
*/
public static final String IMPL_TIME = "time";
// plugin property names for standard props
private static final String PROP_SEQUENCE = "Sequence";
private static final String PROP_INITIAL_VALUE = "InitialValue";
private static final String PROP_ALLOCATE = "Allocate";
private static final String PROP_INCREMENT = "Increment";
private static final Localizer _loc = Localizer.forPackage
(SequenceMetaData.class);
private MetaDataRepository _repos;
private SequenceFactory _factory = null;
private final String _name;
private int _type = Seq.TYPE_DEFAULT;
private String _plugin = IMPL_NATIVE;
private File _source = null;
private Object _scope = null;
private int _srcType = SRC_OTHER;
private int _lineNum = 0;
private int _colNum = 0;
private String[] _comments = null;
private String _sequence = null;
private int _increment = -1;
private int _allocate = -1;
private int _initial = -1;
// instantiated lazily
private transient Seq _instance = null;
/**
* Constructor; supply sequence name.
*/
public SequenceMetaData(String name, MetaDataRepository repos) {
_name = name;
_repos = repos;
}
/**
* The owning repository.
*/
public MetaDataRepository getRepository() {
return _repos;
}
/**
* The sequence name.
*/
public String getName() {
return _name;
}
public File getSourceFile() {
return _source;
}
public Object getSourceScope() {
return _scope;
}
public int getSourceType() {
return _srcType;
}
public void setSource(File file, Object scope, int srcType) {
_source = file;
_scope = scope;
_srcType = srcType;
}
public int getLineNumber() {
return _lineNum;
}
public void setLineNumber(int lineNum) {
_lineNum = lineNum;
}
public int getColNumber() {
return _colNum;
}
public void setColNumber(int colNum) {
_colNum = colNum;
}
public String getResourceName() {
return _name;
}
/**
* The sequence type.
*/
public int getType() {
return _type;
}
/**
* The sequence type.
*/
public void setType(int type) {
_type = type;
}
/**
* Native sequence name.
*/
public String getSequence() {
return _sequence;
}
/**
* Native sequence name.
*/
public void setSequence(String sequence) {
_sequence = sequence;
}
/**
* Sequence increment, or -1 for default.
*/
public int getIncrement() {
return _increment;
}
/**
* Sequence increment, or -1 for default.
*/
public void setIncrement(int increment) {
_increment = increment;
}
/**
* Sequence values to allocate, or -1 for default.
*/
public int getAllocate() {
return _allocate;
}
/**
* Sequence values to allocate, or -1 for default.
*/
public void setAllocate(int allocate) {
_allocate = allocate;
}
/**
* Initial sequence value, or -1 for default.
*/
public int getInitialValue() {
return _initial;
}
/**
* Initial sequence value, or -1 for default.
*/
public void setInitialValue(int initial) {
_initial = initial;
}
/**
* Plugin string describing the {@link Seq}.
*/
public String getSequencePlugin() {
return _plugin;
}
/**
* Plugin string describing the {@link Seq}.
*/
public void setSequencePlugin(String plugin) {
_plugin = plugin;
}
/**
* A factory to transform spec sequences produced by user factories into
* the OpenJPA sequence type.
*/
public SequenceFactory getSequenceFactory() {
return _factory;
}
/**
* A factory to transform spec sequences produced by user factories into
* the OpenJPA sequence type.
*/
public void setSequenceFactory(SequenceFactory factory) {
_factory = factory;
}
/**
* Return the initialized sequence instance.
*/
public synchronized Seq getInstance(ClassLoader envLoader) {
if (_instance == null)
_instance = instantiate(envLoader);
return _instance;
}
/**
* Create a new uninitialized instance of this sequence.
*/
protected Seq instantiate(ClassLoader envLoader) {
if (NAME_SYSTEM.equals(_name))
return _repos.getConfiguration().getSequenceInstance();
try {
PluginValue plugin = newPluginValue("sequence-plugin");
plugin.setString(_plugin);
String clsName = plugin.getClassName();
Class cls = Class.forName(clsName, true,
(ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(Seq.class)));
StringBuffer props = new StringBuffer();
if (plugin.getProperties() != null)
props.append(plugin.getProperties());
addStandardProperties(props);
// allow user-class specification of either our sequence
// interface or a factory class
Seq seq;
if (Seq.class.isAssignableFrom(cls)) {
seq = (Seq) AccessController.doPrivileged(
J2DoPrivHelper.newInstanceAction(cls));
Configurations.configureInstance(seq,
_repos.getConfiguration(), props.toString());
if(_type != Seq.TYPE_DEFAULT)
seq.setType(_type);
} else if (_factory != null)
seq = _factory.toSequence(cls, props.toString());
else
throw new MetaDataException(_loc.get("not-seq-cls", _name,
cls));
return seq;
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
if (e instanceof PrivilegedActionException)
e = ((PrivilegedActionException) e).getException();
throw new MetaDataException(_loc.get("cant-init-seq", _name)).
setCause(e);
}
}
/**
* Create a new plugin value for sequences. Returns a standard
* {@link SeqValue} by default.
*/
protected PluginValue newPluginValue(String property) {
return new SeqValue(property);
}
/**
* Add standard properties to the given properties buffer.
*/
protected void addStandardProperties(StringBuffer props) {
appendProperty(props, PROP_SEQUENCE, _sequence);
appendProperty(props, PROP_INITIAL_VALUE, _initial);
appendProperty(props, PROP_ALLOCATE, _allocate);
appendProperty(props, PROP_INCREMENT, _increment);
}
/**
* Add a string property to the buffer. Nothing will be added if value
* is null or empty string.
*/
protected void appendProperty(StringBuffer props, String name, String val) {
if (StringUtils.isEmpty(val))
return;
if (props.length() > 0)
props.append(",");
props.append(name).append("=").append(val);
}
/**
* Add an int property to the buffer. Nothing will be added if value is -1.
*/
protected void appendProperty(StringBuffer props, String name, int val) {
if (val == -1)
return;
if (props.length() > 0)
props.append(",");
props.append(name).append("=").append(val);
}
/**
* Close user sequence instance.
*/
public void close() {
if (_instance != null && !NAME_SYSTEM.equals(_name))
try {
_instance.close();
} catch (Exception e) {
}
}
@Override
public String toString() {
return _name;
}
///////////////
// Commentable
///////////////
public String[] getComments() {
return (_comments == null) ? EMPTY_COMMENTS : _comments;
}
public void setComments(String[] comments) {
_comments = comments;
}
/**
* Allow facades to supply adapters from a spec sequence type to the
* OpenJPA sequence type.
*/
public static interface SequenceFactory
extends Serializable {
/**
* Transform the given class named in metadata into a sequence.
*/
public Seq toSequence (Class cls, String props)
throws Exception;
}
}
