private DependencyEngine getDependencyEngine(String id) {
for (DependencyEngine dependencyEngine : dependencyEngines) {
if (dependencyEngine == null || dependencyEngine.getDependencyEngineId() == null) continue;
if (dependencyEngine.getDependencyEngineId().equalsIgnoreCase(id)) return dependencyEngine;
}
return null;
}
public synchronized List<String> getDependencyEngineIds() {
List<String> list = new ArrayList<String>();
for (DependencyEngine dependencyEngine : dependencyEngines) {
if (dependencyEngine == null || dependencyEngine.getDependencyEngineId() == null) continue;
list.add(new String(dependencyEngine.getDependencyEngineId()));
}
return list;
}
public DependencyEnginePool(DependencyEngine... dependencyEngines) {
if (dependencyEngines != null) {
for (DependencyEngine dependencyEngine : dependencyEngines) {
if (dependencyEngine.getDependencyEngineId() == null)
dependencyEngine.setDependencyEngineId(dependencyEngine.getClass().getSimpleName());
add(dependencyEngine.getDependencyEngineId(), dependencyEngine);
}
}
}
public synchronized DependencyEngine get(Arguments arguments) {
DependencyEngine dependencyEngine = null;
try {
dependencyEngine = findEngine(arguments);
} catch (DtException ex) {
dependencyEngine = getDefaultEngine();
}
if (arguments.getDependencyEngineId() != null
&& arguments.getDependencyEngineId().length() > 0) {
if (!(dependencyEngine != null
&& dependencyEngine.getDependencyEngineId() != null
&& dependencyEngine
.getDependencyEngineId()
.equalsIgnoreCase(arguments.getDependencyEngineId()))) {
throw new DtException(
"unable to find a dependency engine with id: " + arguments.getDependencyEngineId());
}
}
;
return dependencyEngine;
}
private DependencyEngine findEngine(Arguments arguments) {
DependencyEngine engineMaybe = null;
boolean ambiguousSituation = false;
for (DependencyEngine dependencyEngine : dependencyEngines) {
if (dependencyEngine == null) continue;
if (dependencyEngine.getArgumentsMatchThisEngine(arguments)
== DependencyEngine.ArgumentsMatch.yes) return dependencyEngine;
if (dependencyEngine.getArgumentsMatchThisEngine(arguments)
== DependencyEngine.ArgumentsMatch.maybe) {
if (engineMaybe == null) {
engineMaybe = dependencyEngine;
} else {
ambiguousSituation = true;
}
}
}
if (!ambiguousSituation && engineMaybe != null) {
return engineMaybe;
}
throw new DtException("unable to determine the dependency engine to be utilized");
}
public synchronized void add(String id, DependencyEngine dependencyEngine) {
if (id == null || id.length() == 0) {
throw new DtException("Unable to load the dependency engine. Id not specified.");
}
if (getDependencyEngine(id) != null) {
throw new DtException(
"Unable to load the dependency engine. Dependency engine with id="
+ id
+ " already exists.");
}
dependencyEngine.setDependencyEngineId(id);
addDependencyEngine(dependencyEngine);
}
