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Cayenne Object Persistence Framework
/*****************************************************************
* 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.cayenne.project;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.cayenne.conf.ConfigStatus;
import org.apache.cayenne.conf.Configuration;
import org.apache.cayenne.project.validator.Validator;
/**
* Describes a model of Cayenne project. Project is a set of files in the filesystem
* describing storing Cayenne DataMaps, DataNodes and other information.
*
* Project has a project directory, which is a canonical directory. All project files are
* relative to the project directory.
*
*
* @author Andrus Adamchik
*/
public abstract class Project {
private static final Logger logObj = Logger.getLogger(Project.class);
public static final String CURRENT_PROJECT_VERSION = "2.0";
static final int UPGRADE_STATUS_OLD = -1;
static final int UPGRADE_STATUS_CURRENT = 0;
static final int UPGRADE_STATUS_NEW = 1;
protected File projectDir;
protected List files = new ArrayList();
protected int upgradeStatus;
protected List upgradeMessages;
protected boolean modified;
/**
* Factory method to create the right project type given project file.
*/
public static Project createProject(File projectFile) {
logObj.debug("createProject: " + projectFile);
String fileName = projectFile.getName();
if (fileName.endsWith(Configuration.DEFAULT_DOMAIN_FILE)) {
return new ApplicationProject(projectFile);
}
else if (fileName.endsWith(DataMapFile.LOCATION_SUFFIX)) {
return new DataMapProject(projectFile);
}
else {
throw new ProjectException("Unsupported project file: " + projectFile);
}
}
/**
* @since 1.2
*/
protected Project() {
}
/**
* Constructor for Project. projectFile must denote a file (existent or
* non-existent) in an existing directory. If projectFile has no parent directory,
* current directory is assumed.
*/
public Project(File projectFile) {
initialize(projectFile);
postInitialize(projectFile);
}
/**
* @since 1.2
*/
protected void initialize(File projectFile) {
if (projectFile != null) {
File parent = projectFile.getParentFile();
if (parent == null) {
parent = new File(System.getProperty("user.dir"));
}
if (!parent.isDirectory()) {
throw new ProjectException(
"Project directory does not exist or is not a directory: "
+ parent);
}
try {
projectDir = parent.getCanonicalFile();
}
catch (IOException e) {
throw new ProjectException("Error creating project.", e);
}
}
}
/**
* Finished project initialization. Called from constructor. Default implementation
* builds a file list and checks for upgrades.
*/
protected void postInitialize(File projectFile) {
logObj.debug("postInitialize with: " + projectFile);
// take a snapshot of files used by the project
files = Collections.synchronizedList(buildFileList());
upgradeMessages = Collections.synchronizedList(new ArrayList());
checkForUpgrades();
}
/**
* Returns true if project location is not defined. For instance, when project was
* created in memory and is not tied to a file yet.
*/
public boolean isLocationUndefined() {
return getMainFile() == null;
}
/**
* Returns true if the project needs to be upgraded.
*
* @deprecated since 2.0 use 'getUpgradeStatus'.
*/
public boolean isUpgradeNeeded() {
return upgradeStatus < 0;
}
/**
* Returns project upgrade status. "0" means project version matches the framework
* version, "-1" means project is older than the framework, "+1" means the framework
* is older than the project.
*
* @since 2.0
*/
public int getUpgradeStatus() {
return upgradeStatus;
}
/**
* Returns a list of upgrade messages.
*/
public List getUpgradeMessages() {
return upgradeMessages;
}
/**
* Returns true is project has renamed files. This is useful when converting from
* older versions of the modeler projects.
*/
public boolean hasRenamedFiles() {
if (files == null) {
return false;
}
synchronized (files) {
Iterator it = files.iterator();
while (it.hasNext()) {
if (((ProjectFile) it.next()).isRenamed()) {
return true;
}
}
}
return false;
}
/**
* Creates a list of project files.
*/
public List buildFileList() {
List projectFiles = new ArrayList();
Iterator nodes = treeNodes();
while (nodes.hasNext()) {
ProjectPath nodePath = (ProjectPath) nodes.next();
Object obj = nodePath.getObject();
ProjectFile f = projectFileForObject(obj);
if (f != null) {
projectFiles.add(f);
}
}
return projectFiles;
}
/**
* Creates an instance of Validator for validating this project.
*/
public Validator getValidator() {
return new Validator(this);
}
/**
* Looks up and returns a file wrapper for a project object. Returns null if no file
* exists.
*/
public ProjectFile findFile(Object obj) {
if (obj == null) {
return null;
}
// to avoid full scan, a map may be a better
// choice of collection here,
// though normally projects have very few files...
synchronized (files) {
Iterator it = files.iterator();
while (it.hasNext()) {
ProjectFile file = (ProjectFile) it.next();
if (file.getObject() == obj) {
return file;
}
}
}
return null;
}
/**
* Returns a canonical file built from symbolic name.
*/
public File resolveFile(String symbolicName) {
try {
// substitute to Windows backslashes if needed
if (File.separatorChar != '/') {
symbolicName = symbolicName.replace('/', File.separatorChar);
}
return new File(projectDir, symbolicName).getCanonicalFile();
}
catch (IOException e) {
// error converting path
logObj.info("Can't convert to canonical form.", e);
return null;
}
}
/**
* Returns a "symbolic" name of a file. Returns null if file is invalid. Symbolic name
* is a string path of a file relative to the project directory. It is built in a
* platform independent fashion.
*/
public String resolveSymbolicName(File file) {
String symbolicName = null;
try {
// accept absolute files only when
// they are in the project directory
String otherPath = file.getCanonicalFile().getPath();
String thisPath = projectDir.getPath();
// invalid absolute pathname, can't continue
if (otherPath.length() + 1 <= thisPath.length()
|| !otherPath.startsWith(thisPath)) {
return null;
}
symbolicName = otherPath.substring(thisPath.length() + 1);
// substitute Windows backslashes if needed
if ((symbolicName != null) && (File.separatorChar != '/')) {
symbolicName = symbolicName.replace(File.separatorChar, '/');
}
return symbolicName;
}
catch (IOException e) {
// error converting path
logObj.info("Can't convert to canonical form.", e);
return null;
}
}
/**
* Returns project directory. This is a directory where project file is located.
*/
public File getProjectDirectory() {
return projectDir;
}
public void setProjectDirectory(File dir) {
this.projectDir = dir;
}
/**
* Returns a canonical form of a main file associated with this project.
*/
public File getMainFile() {
if (projectDir == null) {
return null;
}
ProjectFile f = projectFileForObject(this);
return (f != null) ? resolveFile(f.getLocation()) : null;
}
/**
* @return An object describing failures in the loaded project.
*/
public abstract ConfigStatus getLoadStatus();
public abstract ProjectFile projectFileForObject(Object obj);
/**
* Returns a list of first-level children of the project.
*/
public abstract List getChildren();
/**
* Determines whether the project needs to be upgraded. Populates internal list of
* upgrade messages with discovered information.
*/
public abstract void checkForUpgrades();
/**
* Returns an Iterator over project tree of objects.
*/
public Iterator treeNodes() {
return FlatProjectView.getInstance().flattenProjectTree(this).iterator();
}
/**
* @since 1.1
*/
public abstract void upgrade() throws ProjectException;
/**
* Saves project. All currently existing files are updated, without checking for
* modifications. New files are created as needed, unused files are deleted.
*/
public void save() throws ProjectException {
// sanity check
if (isLocationUndefined()) {
throw new ProjectException("Project location is undefined.");
}
// 1. Traverse project tree to find file wrappers that require update.
List filesToSave = new ArrayList();
List wrappedObjects = new ArrayList();
prepareSave(filesToSave, wrappedObjects);
// 2. Try saving individual file wrappers
processSave(filesToSave);
// 3. Commit changes
List savedFiles = new ArrayList();
Iterator saved = filesToSave.iterator();
while (saved.hasNext()) {
ProjectFile f = (ProjectFile) saved.next();
savedFiles.add(f.saveCommit());
}
// 4. Take care of deleted
processDelete(wrappedObjects, savedFiles);
// 5. Refresh file list
List freshList = buildFileList();
Iterator it = freshList.iterator();
while (it.hasNext()) {
((ProjectFile) it.next()).synchronizeLocation();
}
files = freshList;
synchronized (upgradeMessages) {
upgradeMessages.clear();
}
// update state
setModified(false);
}
protected void prepareSave(List filesToSave, List wrappedObjects)
throws ProjectException {
Iterator nodes = treeNodes();
while (nodes.hasNext()) {
ProjectPath nodePath = (ProjectPath) nodes.next();
Object obj = nodePath.getObject();
ProjectFile existingFile = findFile(obj);
if (existingFile == null) {
// check if project node can have a file
ProjectFile newFile = projectFileForObject(obj);
if (newFile != null) {
filesToSave.add(newFile);
}
}
else if (existingFile.canHandleObject()) {
wrappedObjects.add(existingFile.getObject());
filesToSave.add(existingFile);
}
}
}
/**
* Saves a list of modified files to temporary files.
*/
protected void processSave(List modifiedFiles) throws ProjectException {
// notify that files will be saved
Iterator willSave = modifiedFiles.iterator();
while (willSave.hasNext()) {
ProjectFile f = (ProjectFile) willSave.next();
f.willSave();
}
try {
Iterator modified = modifiedFiles.iterator();
while (modified.hasNext()) {
ProjectFile f = (ProjectFile) modified.next();
if (logObj.isDebugEnabled()) {
logObj.info("Saving file " + f.resolveFile());
}
f.saveTemp();
}
}
catch (Exception ex) {
logObj.info("*** Project save failed, reverting.", ex);
// revert
Iterator modified = modifiedFiles.iterator();
while (modified.hasNext()) {
ProjectFile f = (ProjectFile) modified.next();
f.saveUndo();
}
throw new ProjectException("Project save failed and was canceled.", ex);
}
}
protected void processDelete(List existingObjects, List savedFiles) {
// check for deleted
synchronized (files) {
Iterator oldFiles = files.iterator();
while (oldFiles.hasNext()) {
ProjectFile f = (ProjectFile) oldFiles.next();
File file = f.resolveOldFile();
// this check is needed, since a file can reuse the name
// of a recently deleted file, and we don't want to delete
// new file by mistake
if (file == null || savedFiles.contains(file)) {
continue;
}
boolean delete = false;
if (f.isRenamed()) {
delete = true;
logObj.info("File renamed, deleting old version: " + file);
}
else if (f.getObject() == null) {
delete = true;
logObj.info("Null internal object, deleting file: " + file);
}
else if (!existingObjects.contains(f.getObject())) {
delete = true;
logObj
.info("Object deleted from the project, deleting file: "
+ file);
}
else if (!f.canHandleObject()) {
// this happens too - node can start using JNDI for instance
delete = true;
logObj
.info("Can no longer handle the object, deleting file: "
+ file);
}
if (delete) {
if (!deleteFile(file)) {
logObj.info("*** Failed to delete file, ignoring.");
}
}
}
}
}
protected boolean deleteFile(File f) {
return (f.exists()) ? f.delete() : true;
}
/**
* Returns true if the project is modified.
*/
public boolean isModified() {
return modified;
}
/**
* Updates "modified" state of the project.
*/
public void setModified(boolean modified) {
this.modified = modified;
}
}
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