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;

Conditional expression AST node type.
ConditionalExpression:
   Expression ? Expression : Expression

Since:
2.0
@noinstantiate
This class is not intended to be instantiated by clients./**
 * Conditional expression AST node type.
 *
 * <pre>
 * ConditionalExpression:
 *    Expression <b>?</b> Expression <b>:</b> Expression
 * </pre>
 *
 * @since 2.0
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public class ConditionalExpression extends Expression {

	
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(ConditionalExpression.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

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

	
The "elseExpression" structural property of this node type (child type: Expression). 
Since:
3.0/**
	 * The "elseExpression" structural property of this node type (child type: {@link Expression}).
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor ELSE_EXPRESSION_PROPERTY =
		new ChildPropertyDescriptor(ConditionalExpression.class, "elseExpression", Expression.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(ConditionalExpression.class, properyList);
		addProperty(EXPRESSION_PROPERTY, properyList);
		addProperty(THEN_EXPRESSION_PROPERTY, properyList);
		addProperty(ELSE_EXPRESSION_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 condition expression; lazily initialized; defaults to an unspecified,
but legal, expression.
/**
	 * The condition expression; lazily initialized; defaults to an unspecified,
	 * but legal, expression.
	 */
	private Expression conditionExpression = null;

	
The "then" expression; lazily initialized; defaults to an unspecified,
but legal, expression.
/**
	 * The "then" expression; lazily initialized; defaults to an unspecified,
	 * but legal, expression.
	 */
	private Expression thenExpression = null;

	
The "else" expression; lazily initialized; defaults to an unspecified,
but legal, expression.
/**
	 * The "else" expression; lazily initialized; defaults to an unspecified,
	 * but legal, expression.
	 */
	private Expression elseExpression = null;

	
Creates a new unparented conditional expression node owned by the given
AST. By default, the condition, "then", and "else" expresssions are
unspecified, but legal.

N.B. This constructor is package-private.

Params:
ast – the AST that is to own this node/**
	 * Creates a new unparented conditional expression node owned by the given
	 * AST. By default, the condition, "then", and "else" expresssions are
	 * unspecified, but legal.
	 * <p>
	 * N.B. This constructor is package-private.
	 * </p>
	 *
	 * @param ast the AST that is to own this node
	 */
	ConditionalExpression(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 == THEN_EXPRESSION_PROPERTY) {
			if (get) {
				return getThenExpression();
			} else {
				setThenExpression((Expression) child);
				return null;
			}
		}
		if (property == ELSE_EXPRESSION_PROPERTY) {
			if (get) {
				return getElseExpression();
			} else {
				setElseExpression((Expression) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

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

	@Override
	ASTNode clone0(AST target) {
		ConditionalExpression result = new ConditionalExpression(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.setExpression((Expression) getExpression().clone(target));
		result.setThenExpression(
			(Expression) getThenExpression().clone(target));
		result.setElseExpression(
			(Expression) getElseExpression().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, getExpression());
			acceptChild(visitor, getThenExpression());
			acceptChild(visitor, getElseExpression());
		}
		visitor.endVisit(this);
	}

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

	
Sets the condition of this conditional expression.
Params:
expression – the condition 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 condition of this conditional expression.
	 *
	 * @param expression the condition 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.conditionExpression;
		preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
		this.conditionExpression = expression;
		postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
	}

	
Returns the "then" part of this conditional expression.
Returns:
the "then" expression node/**
	 * Returns the "then" part of this conditional expression.
	 *
	 * @return the "then" expression node
	 */
	public Expression getThenExpression() {
		if (this.thenExpression == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.thenExpression == null) {
					preLazyInit();
					this.thenExpression = new SimpleName(this.ast);
					postLazyInit(this.thenExpression, THEN_EXPRESSION_PROPERTY);
				}
			}
		}
		return this.thenExpression;
	}

	
Sets the "then" part of this conditional expression.
Params:
expression – the "then" 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 "then" part of this conditional expression.
	 *
	 * @param expression the "then" 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 setThenExpression(Expression expression) {
		if (expression == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.thenExpression;
		preReplaceChild(oldChild, expression, THEN_EXPRESSION_PROPERTY);
		this.thenExpression = expression;
		postReplaceChild(oldChild, expression, THEN_EXPRESSION_PROPERTY);
	}

	
Returns the "else" part of this conditional expression.
Returns:
the "else" expression node/**
	 * Returns the "else" part of this conditional expression.
	 *
	 * @return the "else" expression node
	 */
	public Expression getElseExpression() {
		if (this.elseExpression == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.elseExpression == null) {
					preLazyInit();
					this.elseExpression = new SimpleName(this.ast);
					postLazyInit(this.elseExpression, ELSE_EXPRESSION_PROPERTY);
				}
			}
		}
		return this.elseExpression;
	}

	
Sets the "else" part of this conditional expression.
Params:
expression – the "else" 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 "else" part of this conditional expression.
	 *
	 * @param expression the "else" 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 setElseExpression(Expression expression) {
		if (expression == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.elseExpression;
		preReplaceChild(oldChild, expression, ELSE_EXPRESSION_PROPERTY);
		this.elseExpression = expression;
		postReplaceChild(oldChild, expression, ELSE_EXPRESSION_PROPERTY);
	}

	@Override
	int memSize() {
		// treat Code as free
		return BASE_NODE_SIZE + 3 * 4;
	}

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.conditionExpression == null ? 0 : getExpression().treeSize())
			+ (this.thenExpression == null ? 0 : getThenExpression().treeSize())
			+ (this.elseExpression == null ? 0 : getElseExpression().treeSize());
	}
}