Copyright (c) 2016, 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
    
/*******************************************************************************
 * Copyright (c) 2016, 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
 *     
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.internal.compiler.lookup.ModuleBinding;
import org.eclipse.jdt.internal.compiler.lookup.PlainPackageBinding;
import org.eclipse.jdt.internal.compiler.lookup.Scope;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
import org.eclipse.jdt.internal.compiler.util.HashtableOfObject;

public abstract class PackageVisibilityStatement extends ModuleStatement {
	public ImportReference pkgRef;
	public ModuleReference[] targets;
	public char[] pkgName;
	public PlainPackageBinding resolvedPackage;

	public PackageVisibilityStatement(ImportReference pkgRef, ModuleReference[] targets) {
		this.pkgRef = pkgRef;
		this.pkgName = CharOperation.concatWith(this.pkgRef.tokens, '.');
		this.targets = targets;
	}
	public boolean isQualified() {
		return this.targets != null && this.targets.length > 0;
	}
	
	public ModuleReference[] getTargetedModules() {
		return this.targets;
	}

	public boolean resolve(Scope scope) {
		boolean errorsExist = resolvePackageReference(scope) == null;
		if (this.isQualified()) {
			HashtableOfObject modules = new HashtableOfObject(this.targets.length);
			for (int i = 0; i < this.targets.length; i++) {
				ModuleReference ref = this.targets[i];
				// targets will be resolved later (during ModuleDeclaration.resolveModuleDirectives())
				if (modules.containsKey(ref.moduleName)) {
					scope.problemReporter().duplicateModuleReference(IProblem.DuplicateModuleRef, ref);
					errorsExist = true;
				} else {
					modules.put(ref.moduleName, ref);
				}
			}
		}
		return !errorsExist;
	}
	public int computeSeverity(int problemId) {
		return ProblemSeverities.Error;
	}
	protected PlainPackageBinding resolvePackageReference(Scope scope) {
		if (this.resolvedPackage != null)
			return this.resolvedPackage;
		ModuleDeclaration exportingModule = scope.compilationUnitScope().referenceContext.moduleDeclaration;
		ModuleBinding src = exportingModule.binding;
		this.resolvedPackage = src != null ? src.getOrCreateDeclaredPackage(this.pkgRef.tokens) : null;
		return this.resolvedPackage;
	}

	@Override
	public StringBuffer print(int indent, StringBuffer output) {
		this.pkgRef.print(indent, output);
		if (this.isQualified()) {
			output.append(" to "); //$NON-NLS-1$
			for (int i = 0; i < this.targets.length; i++) {
				if (i > 0) output.append(", "); //$NON-NLS-1$
				this.targets[i].print(0, output);
			}
		}
		return output;
	}
}