CaptureType.java

/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.refactoring.typeconstraints.types;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.dom.ITypeBinding;



public final class CaptureType extends AbstractTypeVariable {

	private WildcardType fWildcard;
	private IJavaProject fJavaProject;

	protected CaptureType(TypeEnvironment environment) {
		super(environment);
	}

	protected void initialize(ITypeBinding binding, IJavaProject javaProject) {
		Assert.isTrue(binding.isCapture());
		super.initialize(binding);
		fWildcard= (WildcardType) getEnvironment().create(binding.getWildcard());
		fJavaProject= javaProject;
	}

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

	public WildcardType getWildcard() {
		return fWildcard;
	}

	@Override
	public boolean doEquals(TType type) {
		return getBindingKey().equals(((CaptureType)type).getBindingKey())
				&& fJavaProject.equals(((CaptureType)type).fJavaProject);
	}

	@Override
	public int hashCode() {
		return getBindingKey().hashCode();
	}

	@Override
	protected boolean doCanAssignTo(TType lhs) {
		switch (lhs.getKind()) {
			case NULL_TYPE:
			case VOID_TYPE:
			case PRIMITIVE_TYPE:
				return false;

			case ARRAY_TYPE:
				return canAssignFirstBoundTo(lhs);

			case GENERIC_TYPE:
				return false;

			case STANDARD_TYPE:
			case PARAMETERIZED_TYPE:
			case RAW_TYPE:
				return canAssignOneBoundTo(lhs);

			case UNBOUND_WILDCARD_TYPE:
			case EXTENDS_WILDCARD_TYPE:
			case SUPER_WILDCARD_TYPE:
				return ((WildcardType)lhs).checkAssignmentBound(this);

			case TYPE_VARIABLE:
				return false; //fWildcard.doCanAssignTo(lhs);

			case CAPTURE_TYPE:
				return ((CaptureType)lhs).checkLowerBound(this.getWildcard());

		}
		return false;
	}

	protected boolean checkLowerBound(TType rhs) {
		if (! getWildcard().isSuperWildcardType())
			return false;

		return rhs.canAssignTo(getWildcard().getBound());
	}

	private boolean canAssignFirstBoundTo(TType lhs) {
		if (fBounds.length > 0 && fBounds[0].isArrayType()) {
			// capture of ? extends X[]
			return fBounds[0].canAssignTo(lhs);
		}
		return false;
	}

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

	@Override
	protected String getPlainPrettySignature() {
		return "capture-of " + fWildcard.getPrettySignature(); //$NON-NLS-1$
	}
}