Java tutorial
/******************************************************************************* * Copyright (c) 2013, 2014 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; /** * Expression method reference AST node type (added in JLS8 API). * <pre> * ExpressionMethodReference: * Expression <b>::</b> * [ <b><</b> Type { <b>,</b> Type } <b>></b> ] * Identifier * </pre> * * @since 3.10 * @noinstantiate This class is not intended to be instantiated by clients. */ @SuppressWarnings({ "rawtypes", "unchecked" }) public class ExpressionMethodReference extends MethodReference { /** * The "expression" structural property of this node type (child type: {@link Expression}). */ public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = new ChildPropertyDescriptor( ExpressionMethodReference.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ /** * The "typeArguments" structural property of this node type (element type: {@link Type}) */ public static final ChildListPropertyDescriptor TYPE_ARGUMENTS_PROPERTY = internalTypeArgumentsFactory( ExpressionMethodReference.class); /** * The "name" structural property of this node type (child type: {@link SimpleName}). */ public static final ChildPropertyDescriptor NAME_PROPERTY = new ChildPropertyDescriptor( ExpressionMethodReference.class, "name", SimpleName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$ /** * A list of property descriptors (element type: * {@link StructuralPropertyDescriptor}), * or null if uninitialized. */ private static final List PROPERTY_DESCRIPTORS_8_0; static { List propertyList = new ArrayList(4); createPropertyList(ExpressionMethodReference.class, propertyList); addProperty(EXPRESSION_PROPERTY, propertyList); addProperty(TYPE_ARGUMENTS_PROPERTY, propertyList); addProperty(NAME_PROPERTY, propertyList); PROPERTY_DESCRIPTORS_8_0 = reapPropertyList(propertyList); } /** * 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 AST.JLS* constants * @return a list of property descriptors (element type: * {@link StructuralPropertyDescriptor}) */ public static List propertyDescriptors(int apiLevel) { return PROPERTY_DESCRIPTORS_8_0; } /** * The expression; lazily initialized; defaults to an unspecified, * legal expression. */ private Expression expression = null; /** * The method name; lazily initialized; defaults to an unspecified, * legal Java method name. */ private SimpleName methodName = null; /** * Creates a new AST node for an ExpressionMethodReference declaration owned * by the given AST. * <p> * N.B. This constructor is package-private; all subclasses must be * declared in the same package; clients are unable to declare * additional subclasses. * </p> * * @param ast the AST that is to own this node */ ExpressionMethodReference(AST ast) { super(ast); unsupportedIn2_3_4(); } @Override final ChildListPropertyDescriptor internalTypeArgumentsProperty() { return TYPE_ARGUMENTS_PROPERTY; } @Override final List internalStructuralPropertiesForType(int apiLevel) { return propertyDescriptors(apiLevel); } @Override final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { if (property == NAME_PROPERTY) { if (get) { return getName(); } else { setName((SimpleName) child); return null; } } if (property == EXPRESSION_PROPERTY) { if (get) { return getExpression(); } else { setExpression((Expression) child); return null; } } // allow default implementation to flag the error return super.internalGetSetChildProperty(property, get, child); } @Override final List internalGetChildListProperty(ChildListPropertyDescriptor property) { if (property == TYPE_ARGUMENTS_PROPERTY) { return typeArguments(); } // allow default implementation to flag the error return super.internalGetChildListProperty(property); } @Override final int getNodeType0() { return EXPRESSION_METHOD_REFERENCE; } @Override ASTNode clone0(AST target) { ExpressionMethodReference result = new ExpressionMethodReference(target); result.setSourceRange(getStartPosition(), getLength()); result.setExpression((Expression) ASTNode.copySubtree(target, getExpression())); result.typeArguments().addAll(ASTNode.copySubtrees(target, typeArguments())); result.setName((SimpleName) getName().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()); acceptChildren(visitor, this.typeArguments); acceptChild(visitor, getName()); } visitor.endVisit(this); } /** * Returns the expression of this expression method reference expression * * @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 expression method reference. * * @param expression the 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 live ordered list of type arguments of this expression method reference * * @return the live list of type arguments * (element type: {@link Type}) */ @Override public List typeArguments() { return this.typeArguments; } /** * Returns the name of the method referenced in this expression. * * @return the method name node */ public SimpleName getName() { if (this.methodName == null) { // lazy init must be thread-safe for readers synchronized (this) { if (this.methodName == null) { preLazyInit(); this.methodName = new SimpleName(this.ast); postLazyInit(this.methodName, NAME_PROPERTY); } } } return this.methodName; } /** * Sets the name of the method referenced in this expression to the * given name. * * @param name the new method name * @exception IllegalArgumentException if: * <ul> * <li>the node belongs to a different AST</li> * <li>the node already has a parent</li> * </ul> */ public void setName(SimpleName name) { if (name == null) { throw new IllegalArgumentException(); } ASTNode oldChild = this.methodName; preReplaceChild(oldChild, name, NAME_PROPERTY); this.methodName = name; postReplaceChild(oldChild, name, NAME_PROPERTY); } @Override int memSize() { // treat Code as free return BASE_NODE_SIZE + 3 * 4; } @Override int treeSize() { return memSize() + (this.expression == null ? 0 : getExpression().treeSize()) + (this.typeArguments == null ? 0 : this.typeArguments.listSize()) + (this.methodName == null ? 0 : getName().treeSize()); } }