package de.fhdw.wtf.context.core;
   
   import java.math.BigInteger;
   import java.util.Collection;
   
   import de.fhdw.wtf.context.exception.OutOfScopeException;
   import de.fhdw.wtf.persistence.facade.TypeManager;
   import de.fhdw.wtf.persistence.meta.Link;
   import de.fhdw.wtf.persistence.meta.MapLink;
  import de.fhdw.wtf.persistence.meta.Object;
  import de.fhdw.wtf.persistence.meta.UnidirectionalLink;
  import de.fhdw.wtf.persistence.meta.UserObject;
  import de.fhdw.wtf.persistence.utils.Tuple;
  
  /**
   * An implementation of a Context to represent the absence of a Context. Every call to this Context will result in an
   * exception except from methods like commit, savePoint or rollback. These methods will simply have no effect.
   */
  public class NoContext extends Context {
  	
  	/**
  	 * Creates a new NoContext.
  	 */
  	public NoContext() {
  	}
  	
  	@Override
  	public Collection<UserObject> find(final String associationName, final String value) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<UserObject> find(final String associationName, final BigInteger value) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<Tuple<UnidirectionalLink, UserObject>> inverseGet(final String associationName,
  			final UserObject object) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<Tuple<UnidirectionalLink, Object>> get(final UserObject object, final String associationName) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<Tuple<MapLink, Object>> get(final UserObject object,
  			final String associationName,
  			final String key) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<Tuple<MapLink, Object>> get(final UserObject object,
  			final String associationName,
  			final BigInteger key) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public Collection<Tuple<MapLink, Object>> get(final UserObject object,
  			final String associationName,
  			final UserObject key) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public UserObject create(final String typeName) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public UnidirectionalLink set(final UserObject object, final String associationName, final String val) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public UnidirectionalLink set(final UserObject object, final String associationName, final BigInteger val) {
  		this.throwException();
  		return null;
  	}
  	
  	@Override
  	public UnidirectionalLink set(final UserObject object, final String associationName, final UserObject target) {
  		this.throwException();
  		return null;
  	}
  	
 	@Override
 	public MapLink put(final UserObject owner, final String associationName, final UserObject target, final String key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner, final String associationName, final BigInteger target, final String key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner, final String associationName, final String target, final String key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner,
 			final String associationName,
 			final UserObject target,
 			final BigInteger key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner,
 			final String associationName,
 			final BigInteger target,
 			final BigInteger key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner, final String associationName, final String target, final BigInteger key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner,
 			final String associationName,
 			final UserObject target,
 			final UserObject key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner,
 			final String associationName,
 			final BigInteger target,
 			final UserObject key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public MapLink put(final UserObject owner, final String associationName, final String target, final UserObject key) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public void commit() {
 		// nothing to do
 	}
 	
 	@Override
 	public void rollback() {
 		// nothing to do
 	}
 	
 	@Override
 	public void savePoint() {
 		// nothing to do
 	}
 	
 	@Override
 	public void rollbackToSavePoint() {
 		// nothing to do
 	}
 	
 	@Override
 	public void unset(final Link toUnset) {
 		this.throwException();
 	}
 	
 	@Override
 	public TypeManager getTypeManager() {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public Collection<UserObject> getObjectsByType(final String typeName) {
 		this.throwException();
 		return null;
 	}
 	
 	@Override
 	public UserObject checkout(final long object) {
 		this.throwException();
 		return null;
 	}
 	
 	/**
 	 * Throws an exception of type OutOfScopeException.
 	 */
 	private void throwException() {
 		final OutOfScopeException excpetion = new OutOfScopeException(Thread.currentThread().getName());
 		Logger.getInstance().logError(excpetion.getMessage());
 		throw excpetion;
 	}
 }