Copyright (c) 2000, 2013 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) 2000, 2013 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;

Assert statement AST node type.
AssertStatement:
   assert Expression [ : Expression ] ;

Since:
2.0
@noinstantiate
This class is not intended to be instantiated by clients./**
 * Assert statement AST node type.
 *
 * <pre>
 * AssertStatement:
 *    <b>assert</b> Expression [ <b>:</b> Expression ] <b>;</b>
 * </pre>
 *
 * @since 2.0
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public class AssertStatement extends Statement {

	
The "expression" structural property of this node type (child type: Expression). 
Since:
3.0/**
	 * The "expression" structural property of this node type (child type: {@link Expression}).
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor EXPRESSION_PROPERTY =
		new ChildPropertyDescriptor(AssertStatement.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

	
The "message" structural property of this node type (child type: Expression). 
Since:
3.0/**
	 * The "message" structural property of this node type (child type: {@link Expression}).
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor MESSAGE_PROPERTY =
		new ChildPropertyDescriptor(AssertStatement.class, "message", Expression.class, OPTIONAL, CYCLE_RISK); //$NON-NLS-1$

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

	static {
		List properyList = new ArrayList(3);
		createPropertyList(AssertStatement.class, properyList);
		addProperty(EXPRESSION_PROPERTY, properyList);
		addProperty(MESSAGE_PROPERTY, properyList);
		PROPERTY_DESCRIPTORS = reapPropertyList(properyList);
	}

	
Returns a list of structural property descriptors for this node type.
Clients must not modify the result.
Params:
apiLevel – the API level; one of the
AST.JLS* constants
Returns:
a list of property descriptors (element type: StructuralPropertyDescriptor)
Since:
3.0/**
	 * 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})
	 * @since 3.0
	 */
	public static List propertyDescriptors(int apiLevel) {
		return PROPERTY_DESCRIPTORS;
	}

	
The expression; lazily initialized; defaults to a unspecified, but legal,
expression.
/**
	 * The expression; lazily initialized; defaults to a unspecified, but legal,
	 * expression.
	 */
	private Expression expression = null;

	
The message expression; null for none; defaults to none.
/**
	 * The message expression; <code>null</code> for none; defaults to none.
	 */
	private Expression optionalMessageExpression = null;

	
Creates a new unparented assert statement node owned by the given
AST. By default, the assert statement has an unspecified, but legal,
expression, and not message expression.

N.B. This constructor is package-private.

Params:
ast – the AST that is to own this node/**
	 * Creates a new unparented assert statement node owned by the given
	 * AST. By default, the assert statement has an unspecified, but legal,
	 * expression, and not message expression.
	 * <p>
	 * N.B. This constructor is package-private.
	 * </p>
	 *
	 * @param ast the AST that is to own this node
	 */
	AssertStatement(AST ast) {
		super(ast);
	}

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

	@Override
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
		if (property == EXPRESSION_PROPERTY) {
			if (get) {
				return getExpression();
			} else {
				setExpression((Expression) child);
				return null;
			}
		}
		if (property == MESSAGE_PROPERTY) {
			if (get) {
				return getMessage();
			} else {
				setMessage((Expression) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

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

	@Override
	ASTNode clone0(AST target) {
		AssertStatement result = new AssertStatement(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.copyLeadingComment(this);
		result.setExpression(
			(Expression) ASTNode.copySubtree(target, getExpression()));
		result.setMessage(
			(Expression) ASTNode.copySubtree(target, getMessage()));
		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, getExpression());
			acceptChild(visitor, getMessage());
		}
		visitor.endVisit(this);
	}

	
Returns the first expression of this assert statement.
Returns:
the expression node/**
	 * Returns the first expression of this assert statement.
	 *
	 * @return the expression node
	 */
	public Expression getExpression() {
		if (this.expression == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.expression == null) {
					preLazyInit();
					this.expression = new SimpleName(this.ast);
					postLazyInit(this.expression, EXPRESSION_PROPERTY);
				}
			}
		}
		return this.expression;
	}

	
Sets the first expression of this assert statement.
Params:
expression – the new expression node
Throws:
IllegalArgumentException – if:

the node belongs to a different AST
the node already has a parent
a cycle in would be created
/**
	 * Sets the first expression of this assert statement.
	 *
	 * @param expression the new expression node
	 * @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 setExpression(Expression expression) {
		if (expression == null) {
			throw new IllegalArgumentException();
		}
		// an AssertStatement may occur inside an Expression - must check cycles
		ASTNode oldChild = this.expression;
		preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
		this.expression = expression;
		postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
	}

	
Returns the message expression of this assert statement, or
null if there is none.
Returns:
the message expression node, or null if there
   is none/**
	 * Returns the message expression of this assert statement, or
	 * <code>null</code> if there is none.
	 *
	 * @return the message expression node, or <code>null</code> if there
	 *    is none
	 */
	public Expression getMessage() {
		return this.optionalMessageExpression;
	}

	
Sets or clears the message expression of this assert statement.
Params:
expression – the message expression node, or null if
   there is none
Throws:
IllegalArgumentException – if:

the node belongs to a different AST
the node already has a parent
a cycle in would be created
/**
	 * Sets or clears the message expression of this assert statement.
	 *
	 * @param expression the message expression node, or <code>null</code> if
	 *    there is none
	 * @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 setMessage(Expression expression) {
		// an AsertStatement may occur inside an Expression - must check cycles
		ASTNode oldChild = this.optionalMessageExpression;
		preReplaceChild(oldChild, expression, MESSAGE_PROPERTY);
		this.optionalMessageExpression = expression;
		postReplaceChild(oldChild, expression, MESSAGE_PROPERTY);
	}

	@Override
	int memSize() {
		return super.memSize() + 2 * 4;
	}

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.expression == null ? 0 : getExpression().treeSize())
			+ (this.optionalMessageExpression == null ? 0 : getMessage().treeSize());

	}
}