@Override
public Iterable<Object> getInstances(Object instance, String property) {
List<Object> result = new ArrayList<Object>();
for (Value entity : graph.values(getValue(instance), Values.iri(property)))
result.add(getInstance(entity));
return result;
}
@Override
public Iterable<Object> getInstances(String property, String value) {
List<Object> result = new ArrayList<Object>();
for (Value entity : graph.project(Values.iri(property), Values.iri(value)))
result.add(getInstance(entity));
return result;
}
@Override
public String getValue(Object instance, String property) {
Value value = graph.first(getValue(instance), Values.iri(property));
if (value == null) return null;
if (value.getString() != null) return value.getString();
return value.toIri();
}
@Override
public Iterable<String> getValues(Object instance, String property) {
List<String> result = new ArrayList<String>();
for (Value value : graph.values(getValue(instance), Values.iri(property))) {
if (value.getString() != null) result.add(value.getString());
else result.add(value.toIri());
}
return result;
}
private Object getInstance(Value entity) {
Object instance = instances.get(entity);
if (instance != null) return instance;
Value implementation = null;
for (Value impl :
graph.values(entity, Values.iri("http://purl.org/openapp/server/implementation")))
if ("http://purl.org/openapp/server/javaFQName".equals(impl.getType())) implementation = impl;
try {
if (implementation == null) {
instance = new Object();
} else {
logger.info("Instantiating " + implementation.getString());
instance = Class.forName(implementation.getString()).newInstance();
}
instances.put(entity, instance);
entities.put(instance, entity);
if (entity == applicationEntity) applicationInstance = instance;
if (instance instanceof Bindable) ((Bindable) instance).bind(this);
return instance;
} catch (Exception e) {
throw new Error("Error instantiating " + implementation.getString(), e);
}
}
public GraphBinder(String applicationClass, Object instantiator) {
this.instantiator = instantiator;
String home = null;
try {
home = System.getProperty("openapp.home");
if (home != null)
logger.info(
"Binder implementation is set to value of system property openapp.home: " + home);
else logger.info("System property openapp.home has not been set");
} catch (SecurityException e) {
logger.info("Getting system property openapp.home failed: " + e);
}
if (home == null) {
try {
Context ctx = new InitialContext();
home = (String) ctx.lookup("java:comp/env/openapp/home");
logger.info(
"OpenApp home directory is set to value of environment variable java:comp/env/openapp/home: "
+ home);
} catch (NamingException e) {
logger.info("Lookup of environment variable java:comp/env/openapp/home failed: " + e);
}
}
if (home == null) {
File homeDirectoryCheck = new File("openapp");
homeDirectory = homeDirectoryCheck.isDirectory() ? homeDirectoryCheck : null;
if (homeDirectory != null)
logger.info(
"OpenApp home directory found in working directory: "
+ homeDirectory.getAbsolutePath());
} else {
homeDirectory = new File(home);
if (homeDirectory.mkdirs())
logger.info("Created OpenApp home directory: " + this.homeDirectory);
}
if (homeDirectory == null) {
logger.info("OpenApp home directory is not set - will continue without a home directory");
}
if (homeDirectory != null) {
File configuration = new File(homeDirectory, "application.jsonld");
if (!configuration.exists()) {
logger.warn(
"There is no file named application.jsonld in the home directory - a file with default configuration will be created");
InputStream is = null;
OutputStream os = null;
try {
is = getClass().getClassLoader().getResourceAsStream("application.jsonld");
os = new FileOutputStream(configuration);
int read;
while ((read = is.read()) != -1) os.write(read);
} catch (Exception e) {
logger.error(
"Error copying default configuration to file application.jsonld in the home directory",
e);
} finally {
try {
if (is != null) is.close();
if (os != null) os.close();
} catch (IOException e) {
logger.error(
"Error copying default configuration to file application.jsonld in the home directory",
e);
}
}
}
InputStream in = null;
try {
logger.info("Reading configuration from file application.jsonld in the home directory");
in = new FileInputStream(configuration);
JSONLD.parse(in, graph.toReader());
} catch (Exception e) {
logger.error("Could not read file application.jsonld in the home directory", e);
} finally {
if (in != null)
try {
in.close();
} catch (IOException e) {
}
}
} else {
InputStream in = null;
try {
logger.info("Reading default configuration");
in = getClass().getClassLoader().getResourceAsStream("application.jsonld");
JSONLD.parse(in, graph.toReader());
} catch (Exception e) {
logger.error("Could not read default configuration file", e);
} finally {
if (in != null)
try {
in.close();
} catch (IOException e) {
}
}
}
try {
for (Enumeration<URL> moduleUrls =
getClass().getClassLoader().getResources("META-INF/openapp.jsonld");
moduleUrls.hasMoreElements(); ) {
URL moduleUrl = moduleUrls.nextElement();
InputStream in = null;
try {
in = moduleUrl.openStream();
JSONLD.parse(in, graph.toReader());
} catch (Exception e) {
logger.error("Could not read classpath resource " + moduleUrl, e);
} finally {
if (in != null)
try {
in.close();
} catch (IOException e) {
}
}
}
} catch (Exception e) {
logger.error("Error finding resources named META-INF/openapp.jsonld in classpath", e);
}
for (Value entity :
graph.project(
Values.iri("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
Values.iri(applicationClass))) {
applicationEntity = entity;
if (homeDirectory != null)
graph.add(
Collections.singleton(
Values.triple(
applicationEntity,
Values.iri("http://purl.org/openapp/server/homeDirectory"),
Values.string(homeDirectory.getPath()))));
getInstance(applicationEntity);
return;
}
throw new Error("Subject definition of application not found");
}
@Override
public Object getInstance(String property, String value) {
for (Value entity : graph.project(Values.iri(property), Values.iri(value)))
return getInstance(entity);
return null;
}
@Override
public Object getInstance(Object instance, String property) {
Value entity = graph.first(getValue(instance), Values.iri(property));
return entity == null ? null : getInstance(entity);
}
@Override
public Iterable<String> getProperties(Object instance) {
List<String> result = new ArrayList<String>();
for (Value property : graph.properties(getValue(instance))) result.add(property.toIri());
return result;
}