Copyright (c) 2011, 2014 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
    Stephan Herrmann - Contribution for
						Bug 429958 - [1.8][null] evaluate new DefaultLocation attribute of @NonNullByDefault
       Andy Clement (GoPivotal, Inc) aclement@gopivotal.com - Contributions for
                         Bug 409236 - [1.8][compiler] Type annotations on intersection cast types dropped by code generator
/*******************************************************************************
 * Copyright (c) 2011, 2014 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
 *     Stephan Herrmann - Contribution for
 *							Bug 429958 - [1.8][null] evaluate new DefaultLocation attribute of @NonNullByDefault
 *        Andy Clement (GoPivotal, Inc) aclement@gopivotal.com - Contributions for
 *                          Bug 409236 - [1.8][compiler] Type annotations on intersection cast types dropped by code generator
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.IntersectionTypeBinding18;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;

@SuppressWarnings({"rawtypes"})
public class IntersectionCastTypeReference extends TypeReference {
	public TypeReference[] typeReferences;

	public IntersectionCastTypeReference(TypeReference[] typeReferences) {
		this.typeReferences = typeReferences;
		this.sourceStart = typeReferences[0].sourceStart;
		int length = typeReferences.length;
		this.sourceEnd = typeReferences[length - 1].sourceEnd;
		for (int i = 0, max = typeReferences.length; i < max; i++) {
			if ((typeReferences[i].bits & ASTNode.HasTypeAnnotations) != 0) {
				this.bits |= ASTNode.HasTypeAnnotations;
				break;
			}
		}
	}

	@Override
	public TypeReference augmentTypeWithAdditionalDimensions(int additionalDimensions, Annotation[][] additionalAnnotations, boolean isVarargs) {
		throw new UnsupportedOperationException(); // no syntax for this.
	}

	@Override
	public char[] getLastToken() {
		return null;
	}

	
See Also:
getTypeBinding.getTypeBinding(Scope)/**
	 * @see org.eclipse.jdt.internal.compiler.ast.ArrayQualifiedTypeReference#getTypeBinding(org.eclipse.jdt.internal.compiler.lookup.Scope)
	 */
	@Override
	protected TypeBinding getTypeBinding(Scope scope) {
		return null; // not supported here - combined with resolveType(...)
	}

	@Override
	public TypeReference[] getTypeReferences() {
		return this.typeReferences;
	}
	
	@Override
	public TypeBinding resolveType(BlockScope scope, boolean checkBounds, int location) {

		int length = this.typeReferences.length;
		ReferenceBinding[] intersectingTypes = new ReferenceBinding[length];
		boolean hasError = false;
		
		int typeCount = 0;
		nextType:
		for (int i = 0; i < length; i++) {
			final TypeReference typeReference = this.typeReferences[i];
			TypeBinding type = typeReference.resolveType(scope, checkBounds, location);
			if (type == null || ((type.tagBits & TagBits.HasMissingType) != 0)) {
				hasError = true;
				continue;
			}
			if (i == 0) {
				if (type.isBaseType()) { // rejected in grammar for i > 0
					scope.problemReporter().onlyReferenceTypesInIntersectionCast(typeReference);
					hasError = true;
					continue;
				}
				if (type.isArrayType()) { // javac rejects the pedantic cast: (X[] & Serializable & Cloneable) new X[0], what is good for the goose ...
					scope.problemReporter().illegalArrayTypeInIntersectionCast(typeReference);
					hasError = true;
					continue;
				}
			} else if (!type.isInterface()) {
				scope.problemReporter().boundMustBeAnInterface(typeReference, type);
				hasError = true;
				continue;
			}
			for (int j = 0; j < typeCount; j++) {
				final ReferenceBinding priorType = intersectingTypes[j];
				if (TypeBinding.equalsEquals(priorType, type)) {
					scope.problemReporter().duplicateBoundInIntersectionCast(typeReference);
					hasError = true;
					continue;
				}
				if (!priorType.isInterface())
					continue;
				if (TypeBinding.equalsEquals(type.findSuperTypeOriginatingFrom(priorType), priorType)) {
					intersectingTypes[j] = (ReferenceBinding) type;
					continue nextType;
				}
				if (TypeBinding.equalsEquals(priorType.findSuperTypeOriginatingFrom(type), type))
					continue nextType;
			}
			intersectingTypes[typeCount++] = (ReferenceBinding) type;
		}

		if (hasError) {
			return null;
		}
		if (typeCount != length) {
			if (typeCount == 1) {
				return this.resolvedType = intersectingTypes[0];
			}
			System.arraycopy(intersectingTypes, 0, intersectingTypes = new ReferenceBinding[typeCount], 0, typeCount);
		}
		IntersectionTypeBinding18 intersectionType = (IntersectionTypeBinding18) scope.environment().createIntersectionType18(intersectingTypes);
		// check for parameterized interface collisions (when different parameterizations occur)
		ReferenceBinding itsSuperclass = null;
		ReferenceBinding[] interfaces = intersectingTypes;
		ReferenceBinding firstType = intersectingTypes[0];
		if (firstType.isClass()) {
			itsSuperclass = firstType.superclass();
			System.arraycopy(intersectingTypes, 1, interfaces = new ReferenceBinding[typeCount - 1], 0, typeCount - 1);
		}
		
		Map invocations = new HashMap(2);
		nextInterface: for (int i = 0, interfaceCount = interfaces.length; i < interfaceCount; i++) {
			ReferenceBinding one = interfaces[i];
			if (one == null) continue nextInterface;
			if (itsSuperclass != null && scope.hasErasedCandidatesCollisions(itsSuperclass, one, invocations, intersectionType, this))
				continue nextInterface;
			nextOtherInterface: for (int j = 0; j < i; j++) {
				ReferenceBinding two = interfaces[j];
				if (two == null) continue nextOtherInterface;
				if (scope.hasErasedCandidatesCollisions(one, two, invocations, intersectionType, this))
					continue nextInterface;
			}
		}
		if ((intersectionType.tagBits & TagBits.HierarchyHasProblems) != 0)
			return null;

		return (this.resolvedType = intersectionType);
	}

	@Override
	public char[][] getTypeName() {
		// we need to keep a return value that is a char[][]
		return this.typeReferences[0].getTypeName();
	}

	@Override
	public void traverse(ASTVisitor visitor, BlockScope scope) {
		if (visitor.visit(this, scope)) {
			int length = this.typeReferences == null ? 0 : this.typeReferences.length;
			for (int i = 0; i < length; i++) {
				this.typeReferences[i].traverse(visitor, scope);
			}
		}
		visitor.endVisit(this, scope);
	}

	@Override
	public void traverse(ASTVisitor visitor, ClassScope scope) {
		throw new UnsupportedOperationException("Unexpected traversal request: IntersectionTypeReference in class scope"); //$NON-NLS-1$
	}

	@Override
	public StringBuffer printExpression(int indent, StringBuffer output) {
		int length = this.typeReferences == null ? 0 : this.typeReferences.length;
		printIndent(indent, output);
		for (int i = 0; i < length; i++) {
			this.typeReferences[i].printExpression(0, output);
			if (i != length - 1) {
				output.append(" & "); //$NON-NLS-1$
			}
		}
		return output;
	}
}