Java tutorial
/******************************************************************************* * 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; /** * Instanceof expression AST node type. * <pre> * InstanceofExpression: * Expression <b>instanceof</b> Type * </pre> * * @since 2.0 * @noinstantiate This class is not intended to be instantiated by clients. */ @SuppressWarnings("rawtypes") public class InstanceofExpression extends Expression { /** * The "leftOperand" structural property of this node type (child type: {@link Expression}). * @since 3.0 */ public static final ChildPropertyDescriptor LEFT_OPERAND_PROPERTY = new ChildPropertyDescriptor( InstanceofExpression.class, "leftOperand", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ /** * The "rightOperand" structural property of this node type (child type: {@link Type}). * @since 3.0 */ public static final ChildPropertyDescriptor RIGHT_OPERAND_PROPERTY = new ChildPropertyDescriptor( InstanceofExpression.class, "rightOperand", Type.class, MANDATORY, 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 properyList = new ArrayList(3); createPropertyList(InstanceofExpression.class, properyList); addProperty(LEFT_OPERAND_PROPERTY, properyList); addProperty(RIGHT_OPERAND_PROPERTY, properyList); PROPERTY_DESCRIPTORS = reapPropertyList(properyList); } /** * 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 left operand; lazily initialized; defaults to an unspecified, * but legal, simple name. */ private Expression leftOperand = null; /** * The right operand; lazily initialized; defaults to an unspecified, * but legal, simple type. */ private Type rightOperand = null; /** * Creates a new AST node for an instanceof expression owned by the given * AST. By default, the node has unspecified (but legal) operator, * left and right operands. * * @param ast the AST that is to own this node */ InstanceofExpression(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 == LEFT_OPERAND_PROPERTY) { if (get) { return getLeftOperand(); } else { setLeftOperand((Expression) child); return null; } } if (property == RIGHT_OPERAND_PROPERTY) { if (get) { return getRightOperand(); } else { setRightOperand((Type) child); return null; } } // allow default implementation to flag the error return super.internalGetSetChildProperty(property, get, child); } @Override final int getNodeType0() { return INSTANCEOF_EXPRESSION; } @Override ASTNode clone0(AST target) { InstanceofExpression result = new InstanceofExpression(target); result.setSourceRange(getStartPosition(), getLength()); result.setLeftOperand((Expression) getLeftOperand().clone(target)); result.setRightOperand((Type) getRightOperand().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, getLeftOperand()); acceptChild(visitor, getRightOperand()); } visitor.endVisit(this); } /** * Returns the left operand of this instanceof expression. * * @return the left operand node */ public Expression getLeftOperand() { if (this.leftOperand == null) { // lazy init must be thread-safe for readers synchronized (this) { if (this.leftOperand == null) { preLazyInit(); this.leftOperand = new SimpleName(this.ast); postLazyInit(this.leftOperand, LEFT_OPERAND_PROPERTY); } } } return this.leftOperand; } /** * Sets the left operand of this instanceof expression. * * @param expression the left operand 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 setLeftOperand(Expression expression) { if (expression == null) { throw new IllegalArgumentException(); } ASTNode oldChild = this.leftOperand; preReplaceChild(oldChild, expression, LEFT_OPERAND_PROPERTY); this.leftOperand = expression; postReplaceChild(oldChild, expression, LEFT_OPERAND_PROPERTY); } /** * Returns the right operand of this instanceof expression. * * @return the right operand node */ public Type getRightOperand() { if (this.rightOperand == null) { // lazy init must be thread-safe for readers synchronized (this) { if (this.rightOperand == null) { preLazyInit(); this.rightOperand = new SimpleType(this.ast); postLazyInit(this.rightOperand, RIGHT_OPERAND_PROPERTY); } } } return this.rightOperand; } /** * Sets the right operand of this instanceof expression. * * @param referenceType the right operand 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 setRightOperand(Type referenceType) { if (referenceType == null) { throw new IllegalArgumentException(); } ASTNode oldChild = this.rightOperand; preReplaceChild(oldChild, referenceType, RIGHT_OPERAND_PROPERTY); this.rightOperand = referenceType; postReplaceChild(oldChild, referenceType, RIGHT_OPERAND_PROPERTY); } @Override int memSize() { // treat Operator as free return BASE_NODE_SIZE + 2 * 4; } @Override int treeSize() { return memSize() + (this.leftOperand == null ? 0 : getLeftOperand().treeSize()) + (this.rightOperand == null ? 0 : getRightOperand().treeSize()); } }