/*******************************************************************************
 * Copyright (c) 2020 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.core.dom;

import java.util.ArrayList;
import java.util.List;


/**
 * AST node for a module qualified name. A module qualified name is defined as
 * a qualified/simple name preceded by a module name, which qualifies it. Expressing it this
 * way means that the module qualifier and the qualified name get their own AST nodes.
 * <pre>
 * ModuleQualifiedName:
 *    Name <b>.</b> Name
 * </pre>
 *
 *
 *
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @since 3.24
 *
 */
@SuppressWarnings("rawtypes")
public class ModuleQualifiedName extends Name {

	/**
	 * The "qualifier" structural property of this node type (child type: {@link Name}).	 *
	 */
	public static final ChildPropertyDescriptor MODULE_QUALIFIER_PROPERTY =
		new ChildPropertyDescriptor(ModuleQualifiedName.class, "moduleQualifier", SimpleName.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

	/**
	 * The "name" structural property of this node type (child type: {@link SimpleName}).	 *
	 */
	public static final ChildPropertyDescriptor NAME_PROPERTY =
		new ChildPropertyDescriptor(ModuleQualifiedName.class, "name", QualifiedName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$

	/**
	 * A list of property descriptors (element type:
	 * {@link StructuralPropertyDescriptor}),
	 * or null if uninitialized.
	 */
	private static final List PROPERTY_DESCRIPTORS;

	static {
		List propertyList = new ArrayList(3);
		createPropertyList(ModuleQualifiedName.class, propertyList);
		addProperty(MODULE_QUALIFIER_PROPERTY, propertyList);
		addProperty(NAME_PROPERTY, propertyList);
		PROPERTY_DESCRIPTORS = reapPropertyList(propertyList);
	}

	/**
	 * Returns a list of structural property descriptors for this node type.
	 * Clients must not modify the result.
	 *
	 * @param apiLevel the API level; one of the
	 * <code>AST.JLS*</code> constants
	 * @return a list of property descriptors (element type:
	 * {@link StructuralPropertyDescriptor})
	 */
	public static List propertyDescriptors(int apiLevel) {
		return PROPERTY_DESCRIPTORS;
	}

	/**
	 * The identifier; lazily initialized; defaults to a unspecified, legal
	 * Java identifier.
	 */
	private Name moduleQualifier = null;

	/**
	 * The name being module veysqualified; lazily initialized; defaults to a unspecified,
	 * legal Java identifier.
	 */
	private Name name = null;

	/**
	 * Creates a new AST node for a module qualified name owned by the given AST.
	 * <p>
	 * N.B. This constructor is package-private; all subclasses must be
	 * declared in the same package; clients are unable to declare
	 * additional subclasses.
	 * </p>
	 *
	 * @param ast the AST that is to own this node
	 */
	ModuleQualifiedName(AST ast) {
		super(ast);
		unsupportedBelow15();
	}

	@Override
	final List internalStructuralPropertiesForType(int apiLevel) {
		return propertyDescriptors(apiLevel);
	}

	@Override
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
		if (property == MODULE_QUALIFIER_PROPERTY) {
			if (get) {
				return getModuleQualifier();
			} else {
				setModuleQualifier((SimpleName) child);
				return null;
			}
		}
		if (property == NAME_PROPERTY) {
			if (get) {
				return getName();
			} else {
				setName((QualifiedName) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

	@Override
	final int getNodeType0() {
		return MODULE_QUALIFIED_NAME;
	}

	@Override
	ASTNode clone0(AST target) {
		ModuleQualifiedName result = new ModuleQualifiedName(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.setModuleQualifier((SimpleName) getModuleQualifier().clone(target));
		result.setName((QualifiedName) getName().clone(target));
		return result;
	}

	@Override
	final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
		// dispatch to correct overloaded match method
		return matcher.match(this, other);
	}

	@Override
	void accept0(ASTVisitor visitor) {
		boolean visitChildren = visitor.visit(this);
		if (visitChildren) {
			// visit children in normal left to right reading order
			acceptChild(visitor, getModuleQualifier());
			acceptChild(visitor, getName());
		}
		visitor.endVisit(this);
	}

	/**
	 * Returns the qualifier part of this qualified name.
	 *
	 * @return the qualifier part of this qualified name
	 */
	public Name getModuleQualifier() {
		if (this.moduleQualifier == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.moduleQualifier == null) {
					preLazyInit();
					this.moduleQualifier = new SimpleName(this.ast);
					postLazyInit(this.moduleQualifier, MODULE_QUALIFIER_PROPERTY);
				}
			}
		}
		return this.moduleQualifier;
	}

	/**
	 * Sets the qualifier of this qualified name to the given name.
	 *
	 * @param moduleQualifier the qualifier of this qualified name
	 * @exception IllegalArgumentException if:
	 * <ul>
	 * <li>the node belongs to a different AST</li>
	 * <li>the node already has a parent</li>
	 * <li>a cycle in would be created</li>
	 * </ul>
	 */
	public void setModuleQualifier(Name moduleQualifier) {
		if (moduleQualifier == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.moduleQualifier;
		preReplaceChild(oldChild, moduleQualifier, MODULE_QUALIFIER_PROPERTY);
		this.moduleQualifier = moduleQualifier;
		postReplaceChild(oldChild, moduleQualifier, MODULE_QUALIFIER_PROPERTY);
	}

	/**
	 * Returns the name part of this qualified name.
	 *
	 * @return the name being qualified
	 */
	public Name getName() {
		return this.name;
	}

	/**
	 * Sets the name part of this qualified name to the given simple name.
	 *
	 * @param name the identifier of this qualified name
	 * @exception IllegalArgumentException if:
	 * <ul>
	 * <li>the node belongs to a different AST</li>
	 * <li>the node already has a parent</li>
	 * </ul>
	 */
	public void setName(Name name) {
		ASTNode oldChild = this.name;
		preReplaceChild(oldChild, name, NAME_PROPERTY);
		this.name = name;
		postReplaceChild(oldChild, name, NAME_PROPERTY);
	}

	@Override
	void appendName(StringBuffer buffer) {
		getModuleQualifier().appendName(buffer);
		buffer.append('/');
		if (getName() != null) {
			getName().appendName(buffer);
		}
	}

	@Override
	int memSize() {
		return BASE_NAME_NODE_SIZE + 3 * 4;
	}

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.name == null ? 0 : getName().treeSize())
			+ (this.moduleQualifier == null ? 0 : getModuleQualifier().treeSize());
	}
}