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/*******************************************************************************
 * 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
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.env;

/**
 * The name environment provides a callback API that the compiler
 * can use to look up types, compilation units, and packages in the
 * current environment. The name environment is passed to the compiler
 * on creation.
 * 
 * In JLS diction a name environment implements a "host system", with
 * these responsibilities:
 * 

 * Determine which packages and compilation units are "observable" (JLS 7.3 & 7.4.3)
 * Determine to which module a given compilation unit / package is associated (JLS 7.3)
 * 
 * 
 * 
 * Note: This internal interface has been implemented illegally by the
 * org.apache.jasper.glassfish bundle from Orbit, see
 * bug 500211.
 * Avoid changing the API or supply default methods to avoid breaking the Eclipse Help system.
 * 
 */
public interface INameEnvironment {
	/**
	 * Find a type with the given compound name.
	 * Answer the binary form of the type if it is known to be consistent.
	 * Otherwise, answer the compilation unit which defines the type
	 * or null if the type does not exist.
	 * Types in the default package are specified as {{typeName}}.
	 *
	 * It is unknown whether the package containing the type actually exists.
	 *
	 * NOTE: This method can be used to find a member type using its
	 * internal name A$B, but the source file for A is answered if the binary
	 * file is inconsistent.
	 */

	NameEnvironmentAnswer findType(char[][] compoundTypeName);
	/**
	 * Find a type named  in the package .
	 * Answer the binary form of the type if it is known to be consistent.
	 * Otherwise, answer the compilation unit which defines the type
	 * or null if the type does not exist.
	 * The default package is indicated by char[0][].
	 *
	 * It is known that the package containing the type exists.
	 *
	 * NOTE: This method can be used to find a member type using its
	 * internal name A$B, but the source file for A is answered if the binary
	 * file is inconsistent.
	 */

	NameEnvironmentAnswer findType(char[] typeName, char[][] packageName);
	/**
	 * Answer whether packageName is the name of a known subpackage inside
	 * the package parentPackageName. A top level package is found relative to null.
	 * The default package is always assumed to exist.
	 *
	 * For example:
	 *      isPackage({{java}, {awt}}, {event});
	 *      isPackage(null, {java});
	 */

	boolean isPackage(char[][] parentPackageName, char[] packageName);

	/**
	 * This method cleans the environment. It is responsible for releasing the memory
	 * and freeing resources. Passed that point, the name environment is no longer usable.
	 *
	 * A name environment can have a long life cycle, therefore it is the responsibility of
	 * the code which created it to decide when it is a good time to clean it up.
	 */
	void cleanup();

}