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;

Enhanced For statement AST node type (added in JLS3 API).
EnhancedForStatement:
   for ( FormalParameter : Expression )
			Statement

The FormalParameter is represented by a SingleVariableDeclaration (without an initializer).
Since:
3.1
@noinstantiate
This class is not intended to be instantiated by clients./**
 * Enhanced For statement AST node type (added in JLS3 API).
 *
 * <pre>
 * EnhancedForStatement:
 *    <b>for</b> <b>(</b> FormalParameter <b>:</b> Expression <b>)</b>
 * 			Statement
 * </pre>
 * 
 * <p>The FormalParameter is represented by a {@link SingleVariableDeclaration}
 * (without an initializer).</p>
 *
 * @since 3.1
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public class EnhancedForStatement extends Statement {

	
The "parameter" structural property of this node type (child type: SingleVariableDeclaration). /**
	 * The "parameter" structural property of this node type (child type: {@link SingleVariableDeclaration}).
	 */
	public static final ChildPropertyDescriptor PARAMETER_PROPERTY =
		new ChildPropertyDescriptor(EnhancedForStatement.class, "parameter", SingleVariableDeclaration.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

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

	
The "body" structural property of this node type (child type: Statement). /**
	 * The "body" structural property of this node type (child type: {@link Statement}).
	 */
	public static final ChildPropertyDescriptor BODY_PROPERTY =
		new ChildPropertyDescriptor(EnhancedForStatement.class, "body", Statement.class, MANDATORY, 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(4);
		createPropertyList(EnhancedForStatement.class, properyList);
		addProperty(PARAMETER_PROPERTY, properyList);
		addProperty(EXPRESSION_PROPERTY, properyList);
		addProperty(BODY_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)/**
	 * 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 parameter; lazily initialized; defaults to a unspecified,
legal node.
/**
	 * The parameter; lazily initialized; defaults to a unspecified,
	 * legal node.
	 */
	private SingleVariableDeclaration parameter = null;

	
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 body statement; lazily initialized; defaults to an empty block
statement.
/**
	 * The body statement; lazily initialized; defaults to an empty block
	 * statement.
	 */
	private Statement body = null;

	
Creates a new AST node for an enchanced for statement owned by the
given AST. By default, the parameter and expression are unspecified
but legal subtrees, and the body is an empty block.
Params:
ast – the AST that is to own this node/**
	 * Creates a new AST node for an enchanced for statement owned by the
	 * given AST. By default, the parameter and expression are unspecified
	 * but legal subtrees, and the body is an empty block.
	 *
	 * @param ast the AST that is to own this node
	 */
	EnhancedForStatement(AST ast) {
		super(ast);
	    unsupportedIn2();
	}

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

	@Override
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
		if (property == PARAMETER_PROPERTY) {
			if (get) {
				return getParameter();
			} else {
				setParameter((SingleVariableDeclaration) child);
				return null;
			}
		}
		if (property == EXPRESSION_PROPERTY) {
			if (get) {
				return getExpression();
			} else {
				setExpression((Expression) child);
				return null;
			}
		}
		if (property == BODY_PROPERTY) {
			if (get) {
				return getBody();
			} else {
				setBody((Statement) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

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

	@Override
	ASTNode clone0(AST target) {
		EnhancedForStatement result = new EnhancedForStatement(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.copyLeadingComment(this);
		result.setParameter((SingleVariableDeclaration) getParameter().clone(target));
		result.setExpression((Expression) getExpression().clone(target));
		result.setBody(
			(Statement) ASTNode.copySubtree(target, getBody()));
		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, getParameter());
			acceptChild(visitor, getExpression());
			acceptChild(visitor, getBody());
		}
		visitor.endVisit(this);
	}

	
Returns the formal parameter in this enhanced for statement.
Returns:
the parameter/**
	 * Returns the formal parameter in this enhanced for statement.
	 *
	 * @return the parameter
	 */
	public SingleVariableDeclaration getParameter() {
		if (this.parameter == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.parameter == null) {
					preLazyInit();
					this.parameter = this.ast.newSingleVariableDeclaration();
					postLazyInit(this.parameter, PARAMETER_PROPERTY);
				}
			}
		}
		return this.parameter;
	}

	
Sets the formal parameter in this enhanced for statement.
Params:
parameter – the new parameter
Throws:
IllegalArgumentException – if:

the node belongs to a different AST
the node already has a parent
/**
	 * Sets the formal parameter in this enhanced for statement.
	 *
	 * @param parameter the new parameter
	 * @exception IllegalArgumentException if:
	 * <ul>
	 * <li>the node belongs to a different AST</li>
	 * <li>the node already has a parent</li>
	 * </ul>
	 */
	public void setParameter(SingleVariableDeclaration parameter) {
		if (parameter == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.parameter;
		preReplaceChild(oldChild, parameter, PARAMETER_PROPERTY);
		this.parameter = parameter;
		postReplaceChild(oldChild, parameter, PARAMETER_PROPERTY);
	}

	
Returns the expression of this enhanced for statement.
Returns:
the expression node/**
	 * Returns the expression of this enhanced for 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 expression of this enhanced for 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 expression of this enhanced for 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();
		}
		ASTNode oldChild = this.expression;
		preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
		this.expression = expression;
		postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
	}

	
Returns the body of this enchanced for statement.
Returns:
the body statement node/**
	 * Returns the body of this enchanced for statement.
	 *
	 * @return the body statement node
	 */
	public Statement getBody() {
		if (this.body == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.body == null) {
					preLazyInit();
					this.body = new Block(this.ast);
					postLazyInit(this.body, BODY_PROPERTY);
				}
			}
		}
		return this.body;
	}

	
Sets the body of this enhanced for statement.
Params:
statement – the body statement 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 body of this enhanced for statement.
	 *
	 * @param statement the body statement 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 setBody(Statement statement) {
		if (statement == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.body;
		preReplaceChild(oldChild, statement, BODY_PROPERTY);
		this.body = statement;
		postReplaceChild(oldChild, statement, BODY_PROPERTY);
	}

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

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.parameter == null ? 0 : getParameter().treeSize())
			+ (this.expression == null ? 0 : getExpression().treeSize())
			+ (this.body == null ? 0 : getBody().treeSize());
	}
}