Copyright (c) 2000, 2017 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 - Contributions for
							bug 186342 - [compiler][null] Using annotations for null checking
							bug 365519 - editorial cleanup after bug 186342 and bug 365387
							Bug 434570 - Generic type mismatch for parametrized class annotation attribute with inner class
/*******************************************************************************
 * Copyright (c) 2000, 2017 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 - Contributions for
 *								bug 186342 - [compiler][null] Using annotations for null checking
 *								bug 365519 - editorial cleanup after bug 186342 and bug 365387
 *								Bug 434570 - Generic type mismatch for parametrized class annotation attribute with inner class
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.ElementValuePair;
import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;

MemberValuePair node
/**
 * MemberValuePair node
 */
public class MemberValuePair extends ASTNode {

	public char[] name;
	public Expression value;
	public MethodBinding binding;
	
 The representation of this pair in the type system.
/**
	 *  The representation of this pair in the type system.
	 */
	public ElementValuePair compilerElementPair = null;

	public MemberValuePair(char[] token, int sourceStart, int sourceEnd, Expression value) {
		this.name = token;
		this.sourceStart = sourceStart;
		this.sourceEnd = sourceEnd;
		this.value = value;
		if (value instanceof ArrayInitializer) {
			value.bits |= IsAnnotationDefaultValue;
		}
	}

	@Override
	public StringBuffer print(int indent, StringBuffer output) {
		output
			.append(this.name)
			.append(" = "); //$NON-NLS-1$
		this.value.print(0, output);
		return output;
	}

	public void resolveTypeExpecting(final BlockScope scope, final TypeBinding requiredType) {
		if (this.compilerElementPair != null) {
			return;
		}

		if (this.value == null) {
			this.compilerElementPair = new ElementValuePair(this.name, this.value, this.binding);
			return;
		}
		if (requiredType == null) {
			// fault tolerance: keep resolving
			if (this.value instanceof ArrayInitializer) {
				this.value.resolveTypeExpecting(scope, null);
			} else {
				this.value.resolveType(scope);
			}
			this.compilerElementPair = new ElementValuePair(this.name, this.value, this.binding);
			return;
		}

		this.value.setExpectedType(requiredType); // needed in case of generic method invocation - looks suspect, generic method invocation here ???
		final TypeBinding valueType;
		if (this.value instanceof ArrayInitializer) {
			ArrayInitializer initializer = (ArrayInitializer) this.value;
			valueType = initializer.resolveTypeExpecting(scope, this.binding.returnType);
		} else if (this.value instanceof ArrayAllocationExpression) {
			scope.problemReporter().annotationValueMustBeArrayInitializer(this.binding.declaringClass, this.name, this.value);
			this.value.resolveType(scope);
			valueType = null; // no need to pursue
		} else {
			valueType = this.value.resolveType(scope);
			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=248897
			ASTVisitor visitor = new ASTVisitor() {
				@Override
				public boolean visit(SingleNameReference reference, BlockScope scop) {
					if (reference.binding instanceof LocalVariableBinding) {
						((LocalVariableBinding) reference.binding).useFlag = LocalVariableBinding.USED;
					}
					return true;
				}
			};
			this.value.traverse(visitor, scope);
		}
		this.compilerElementPair = new ElementValuePair(this.name, this.value, this.binding);
		if (valueType == null)
			return;

		final TypeBinding leafType = requiredType.leafComponentType();
		// the next check may need deferring:
		final boolean[] shouldExit = { false };
		Runnable check = new Runnable() {
			@Override
			public void run() {
				if (!(MemberValuePair.this.value.isConstantValueOfTypeAssignableToType(valueType, requiredType)
						|| valueType.isCompatibleWith(requiredType))) {
					if (!(requiredType.isArrayType()
							&& requiredType.dimensions() == 1
							&& (MemberValuePair.this.value.isConstantValueOfTypeAssignableToType(valueType, leafType)
									|| valueType.isCompatibleWith(leafType)))) {
						
						if (leafType.isAnnotationType() && !valueType.isAnnotationType()) {
							scope.problemReporter().annotationValueMustBeAnnotation(MemberValuePair.this.binding.declaringClass,
									MemberValuePair.this.name, MemberValuePair.this.value, leafType);
						} else {
							scope.problemReporter().typeMismatchError(valueType, requiredType, MemberValuePair.this.value, null);
						}
						shouldExit[0] = true; // TODO may allow to proceed to find more errors at once
					}
				} else {
					scope.compilationUnitScope().recordTypeConversion(requiredType.leafComponentType(), valueType.leafComponentType());
					MemberValuePair.this.value.computeConversion(scope, requiredType, valueType);
				}
			}
		};
		// ... now or later?
		if (!scope.deferCheck(check)) {
			check.run();
			if (shouldExit[0])
				return;
		}

		// annotation methods can only return base types, String, Class, enum type, annotation types and arrays of these
		checkAnnotationMethodType: {
			switch (leafType.erasure().id) {
				case T_byte :
				case T_short :
				case T_char :
				case T_int :
				case T_long :
				case T_float :
				case T_double :
				case T_boolean :
				case T_JavaLangString :
					if (this.value instanceof ArrayInitializer) {
						ArrayInitializer initializer = (ArrayInitializer) this.value;
						final Expression[] expressions = initializer.expressions;
						if (expressions != null) {
							for (int i =0, max = expressions.length; i < max; i++) {
								Expression expression = expressions[i];
								if (expression.resolvedType == null) continue; // fault-tolerance
								if (expression.constant == Constant.NotAConstant) {
									scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, expressions[i], false);
								}
							}
						}
					} else if (this.value.constant == Constant.NotAConstant) {
						if (valueType.isArrayType()) {
							scope.problemReporter().annotationValueMustBeArrayInitializer(this.binding.declaringClass, this.name, this.value);
						} else {
							scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, this.value, false);
						}
					}
					break checkAnnotationMethodType;
				case T_JavaLangClass :
					if (this.value instanceof ArrayInitializer) {
						ArrayInitializer initializer = (ArrayInitializer) this.value;
						final Expression[] expressions = initializer.expressions;
						if (expressions != null) {
							for (int i =0, max = expressions.length; i < max; i++) {
								Expression currentExpression = expressions[i];
								if (!(currentExpression instanceof ClassLiteralAccess)) {
									scope.problemReporter().annotationValueMustBeClassLiteral(this.binding.declaringClass, this.name, currentExpression);
								}
							}
						}
					} else if (!(this.value instanceof ClassLiteralAccess)) {
						scope.problemReporter().annotationValueMustBeClassLiteral(this.binding.declaringClass, this.name, this.value);
					}
					break checkAnnotationMethodType;
			}
			if (leafType.isEnum()) {
				if (this.value instanceof NullLiteral) {
					scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, this.value, true);
				} else if (this.value instanceof ArrayInitializer) {
					ArrayInitializer initializer = (ArrayInitializer) this.value;
					final Expression[] expressions = initializer.expressions;
					if (expressions != null) {
						for (int i =0, max = expressions.length; i < max; i++) {
							Expression currentExpression = expressions[i];
							if (currentExpression instanceof NullLiteral) {
								scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, currentExpression, true);
							} else if (currentExpression instanceof NameReference) {
								NameReference nameReference = (NameReference) currentExpression;
								final Binding nameReferenceBinding = nameReference.binding;
								if (nameReferenceBinding.kind() == Binding.FIELD) {
									FieldBinding fieldBinding = (FieldBinding) nameReferenceBinding;
									if (!fieldBinding.declaringClass.isEnum()) {
										scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, currentExpression, true);
									}
								}
							}
						}
					}
				} else if (this.value instanceof NameReference) {
					NameReference nameReference = (NameReference) this.value;
					final Binding nameReferenceBinding = nameReference.binding;
					if (nameReferenceBinding.kind() == Binding.FIELD) {
						FieldBinding fieldBinding = (FieldBinding) nameReferenceBinding;
						if (!fieldBinding.declaringClass.isEnum()) {
							if (!fieldBinding.type.isArrayType()) {
								scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, this.value, true);
							} else {
								scope.problemReporter().annotationValueMustBeArrayInitializer(this.binding.declaringClass, this.name, this.value);
							}
						}
					}
				}  else {
					scope.problemReporter().annotationValueMustBeConstant(this.binding.declaringClass, this.name, this.value, true);
				}
				break checkAnnotationMethodType;
			}
			if (leafType.isAnnotationType()) {
				if (!valueType.leafComponentType().isAnnotationType()) { // check annotation type and also reject null literal
					scope.problemReporter().annotationValueMustBeAnnotation(this.binding.declaringClass, this.name, this.value, leafType);
				} else if (this.value instanceof ArrayInitializer) {
					ArrayInitializer initializer = (ArrayInitializer) this.value;
					final Expression[] expressions = initializer.expressions;
					if (expressions != null) {
						for (int i =0, max = expressions.length; i < max; i++) {
							Expression currentExpression = expressions[i];
							if (currentExpression instanceof NullLiteral || !(currentExpression instanceof Annotation)) {
								scope.problemReporter().annotationValueMustBeAnnotation(this.binding.declaringClass, this.name, currentExpression, leafType);
							}
						}
					}
				} else if (!(this.value instanceof Annotation)) {
					scope.problemReporter().annotationValueMustBeAnnotation(this.binding.declaringClass, this.name, this.value, leafType);
				}
				break checkAnnotationMethodType;
			}
		}
	}

	@Override
	public void traverse(ASTVisitor visitor, BlockScope scope) {
		if (visitor.visit(this, scope)) {
			if (this.value != null) {
				this.value.traverse(visitor, scope);
			}
		}
		visitor.endVisit(this, scope);
	}
	public void traverse(ASTVisitor visitor, ClassScope scope) {
		if (visitor.visit(this, scope)) {
			if (this.value != null) {
				this.value.traverse(visitor, scope);
			}
		}
		visitor.endVisit(this, scope);
	}
}