Copyright (c) 2000, 2016 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.refactoring.typeconstraints.types;

public final class NullType extends TType {

	protected NullType(TypeEnvironment environment) {
		super(environment, "N"); //$NON-NLS-1$
	}

	@Override
	public int getKind() {
		return NULL_TYPE;
	}

	@Override
	public TType[] getSubTypes() {
		throw new UnsupportedOperationException();
	}

	@Override
	protected boolean doEquals(TType type) {
		return true;
	}

	@Override
	public int hashCode() {
		return 1234;
	}
	
	@Override
	public String getName() {
		return "null";  //$NON-NLS-1$
	}

	@Override
	protected String getPlainPrettySignature() {
		return getName();
	}

	@Override
	protected boolean doCanAssignTo(TType lhs) {
		int kind= lhs.getKind();
		return kind != PRIMITIVE_TYPE && kind != VOID_TYPE;
	}
}