Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2019 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; /** * Array creation expression AST node type. * <pre> * ArrayCreation: * <b>new</b> PrimitiveType <b>[</b> Expression <b>]</b> { <b>[</b> Expression <b>]</b> } { <b>[</b> <b>]</b> } * <b>new</b> TypeName [ <b><</b> Type { <b>,</b> Type } <b>></b> ] * <b>[</b> Expression <b>]</b> { <b>[</b> Expression <b>]</b> } { <b>[</b> <b>]</b> } * <b>new</b> PrimitiveType <b>[</b> <b>]</b> { <b>[</b> <b>]</b> } ArrayInitializer * <b>new</b> TypeName [ <b><</b> Type { <b>,</b> Type } <b>></b> ] * <b>[</b> <b>]</b> { <b>[</b> <b>]</b> } ArrayInitializer * </pre> * <p> * The mapping from Java language syntax to AST nodes is as follows: * <ul> * <li>the type node is the array type of the creation expression, * with one level of array per set of square brackets,</li> * <li>the dimension expressions are collected into the <code>dimensions</code> * list.</li> * </ul> * * @since 2.0 * @noinstantiate This class is not intended to be instantiated by clients. */ @SuppressWarnings({ "rawtypes", "unchecked" }) public class ArrayCreation extends Expression { /** * The "type" structural property of this node type (child type: {@link ArrayType}). * @since 3.0 */ public static final ChildPropertyDescriptor TYPE_PROPERTY = new ChildPropertyDescriptor(ArrayCreation.class, "type", ArrayType.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$ /** * The "dimensions" structural property of this node type (element type: {@link Expression}). * @since 3.0 */ public static final ChildListPropertyDescriptor DIMENSIONS_PROPERTY = new ChildListPropertyDescriptor( ArrayCreation.class, "dimensions", Expression.class, CYCLE_RISK); //$NON-NLS-1$ /** * The "initializer" structural property of this node type (child type: {@link ArrayInitializer}). * @since 3.0 */ public static final ChildPropertyDescriptor INITIALIZER_PROPERTY = new ChildPropertyDescriptor( ArrayCreation.class, "initializer", ArrayInitializer.class, OPTIONAL, 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(4); createPropertyList(ArrayCreation.class, properyList); addProperty(TYPE_PROPERTY, properyList); addProperty(DIMENSIONS_PROPERTY, properyList); addProperty(INITIALIZER_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 array type; lazily initialized; defaults to a unspecified, * legal array type. */ private ArrayType arrayType = null; /** * The list of dimension expressions (element type: * {@link Expression}). Defaults to an empty list. */ private ASTNode.NodeList dimensions = new ASTNode.NodeList(DIMENSIONS_PROPERTY); /** * The optional array initializer, or <code>null</code> if none; * defaults to none. */ private ArrayInitializer optionalInitializer = null; /** * Creates a new AST node for an array creation expression owned by the * given AST. By default, the array type is an unspecified 1-dimensional * array, the list of dimensions is empty, and there is no array * initializer. * * @param ast the AST that is to own this node */ ArrayCreation(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 == INITIALIZER_PROPERTY) { if (get) { return getInitializer(); } else { setInitializer((ArrayInitializer) child); return null; } } if (property == TYPE_PROPERTY) { if (get) { return getType(); } else { setType((ArrayType) child); return null; } } // allow default implementation to flag the error return super.internalGetSetChildProperty(property, get, child); } @Override final List internalGetChildListProperty(ChildListPropertyDescriptor property) { if (property == DIMENSIONS_PROPERTY) { return dimensions(); } // allow default implementation to flag the error return super.internalGetChildListProperty(property); } @Override final int getNodeType0() { return ARRAY_CREATION; } @Override ASTNode clone0(AST target) { ArrayCreation result = new ArrayCreation(target); result.setSourceRange(getStartPosition(), getLength()); result.setType((ArrayType) getType().clone(target)); result.dimensions().addAll(ASTNode.copySubtrees(target, dimensions())); result.setInitializer((ArrayInitializer) ASTNode.copySubtree(target, getInitializer())); 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, getType()); acceptChildren(visitor, this.dimensions); acceptChild(visitor, getInitializer()); } visitor.endVisit(this); } /** * Returns the array type in this array creation expression. * * @return the array type */ public ArrayType getType() { if (this.arrayType == null) { // lazy init must be thread-safe for readers synchronized (this) { if (this.arrayType == null) { preLazyInit(); this.arrayType = this.ast.newArrayType(this.ast.newPrimitiveType(PrimitiveType.INT)); postLazyInit(this.arrayType, TYPE_PROPERTY); } } } return this.arrayType; } /** * Sets the array type in this array creation expression. * * @param type the new array type * @exception IllegalArgumentException if: * <ul> * <li>the node belongs to a different AST</li> * <li>the node already has a parent</li> * </ul> */ public void setType(ArrayType type) { if (type == null) { throw new IllegalArgumentException(); } // an ArrayCreation cannot occur inside a ArrayType - cycles not possible ASTNode oldChild = this.arrayType; preReplaceChild(oldChild, type, TYPE_PROPERTY); this.arrayType = type; postReplaceChild(oldChild, type, TYPE_PROPERTY); } /** * Returns the live ordered list of dimension expressions in this array * initializer. * * @return the live list of dimension expressions * (element type: {@link Expression}) */ public List dimensions() { return this.dimensions; } /** * Returns the array initializer of this array creation expression, or * <code>null</code> if there is none. * * @return the array initializer node, or <code>null</code> if * there is none */ public ArrayInitializer getInitializer() { return this.optionalInitializer; } /** * Sets or clears the array initializer of this array creation expression. * * @param initializer the array initializer 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 setInitializer(ArrayInitializer initializer) { // an ArrayCreation may occur inside an ArrayInitializer // must check cycles ASTNode oldChild = this.optionalInitializer; preReplaceChild(oldChild, initializer, INITIALIZER_PROPERTY); this.optionalInitializer = initializer; postReplaceChild(oldChild, initializer, INITIALIZER_PROPERTY); } @Override int memSize() { return BASE_NODE_SIZE + 3 * 4; } @Override int treeSize() { int size = memSize() + (this.arrayType == null ? 0 : getType().treeSize()) + (this.optionalInitializer == null ? 0 : getInitializer().treeSize()) + this.dimensions.listSize(); return size; } }