/******************************************************************************* * Copyright (c) 2000, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package net.sourceforge.phpdt.core.dom; import java.util.ArrayList; import java.util.List; /** * Field access expression AST node type. * *
* FieldAccess: * Expression . Identifier ** *
* Note that there are several kinds of expressions that resemble field access * expressions: qualified names, this expressions, and super field access * expressions. The following guidelines help with correct usage: *
ThisExpression
) containing a simple name.
* "this" is a keyword, and therefore invalid as an identifier.FieldAccess
) containing a this expression
* and a simple name. Again, this is because "this" is a keyword, and
* therefore invalid as an identifier.SuperFieldAccess
). "super" is a also
* keyword, and therefore invalid as an identifier.QualifiedName
) or as a field access
* expression (FieldAccess
) containing simple names. Either
* is acceptable, and there is no way to choose between them without
* information about what the names resolve to
* (ASTParser
may return either).FieldAccess
).AST.JLS*
constants
* @return a list of property descriptors (element type:
* {@link StructuralPropertyDescriptor})
* @since 3.0
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The expression; lazily initialized; defaults to an unspecified,
* but legal, simple name.
*/
private Expression expression = null;
/**
* The field; lazily initialized; defaults to an unspecified,
* but legal, simple field name.
*/
private SimpleName fieldName = null;
/**
* Creates a new unparented node for a field access expression owned by the
* given AST. By default, the expression and field are both unspecified,
* but legal, names.
* * N.B. This constructor is package-private. *
* * @param ast the AST that is to own this node */ FieldAccess(AST ast) { super(ast); } /* (omit javadoc for this method) * Method declared on ASTNode. */ final List internalStructuralPropertiesForType(int apiLevel) { return propertyDescriptors(apiLevel); } /* (omit javadoc for this method) * Method declared on ASTNode. */ 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 == NAME_PROPERTY) { if (get) { return getName(); } else { setName((SimpleName) child); return null; } } // allow default implementation to flag the error return super.internalGetSetChildProperty(property, get, child); } /* (omit javadoc for this method) * Method declared on ASTNode. */ final int getNodeType0() { return FIELD_ACCESS; } /* (omit javadoc for this method) * Method declared on ASTNode. */ ASTNode clone0(AST target) { FieldAccess result = new FieldAccess(target); result.setSourceRange(this.getStartPosition(), this.getLength()); result.setExpression((Expression) getExpression().clone(target)); result.setName((SimpleName) getName().clone(target)); return result; } /* (omit javadoc for this method) * Method declared on ASTNode. */ final boolean subtreeMatch0(ASTMatcher matcher, Object other) { // dispatch to correct overloaded match method return matcher.match(this, other); } /* (omit javadoc for this method) * Method declared on ASTNode. */ 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, getName()); } visitor.endVisit(this); } /** * Returns the expression of this field access 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 field access expression. * * @param expression the new expression * @exception IllegalArgumentException if: ** Note that bindings are generally unavailable unless requested when the * AST is being built. *
* * @return the variable binding, ornull
if the binding cannot
* be resolved
* @since 3.0
*/
public IVariableBinding resolveFieldBinding() {
return this.ast.getBindingResolver().resolveField(this);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return
memSize()
+ (this.expression == null ? 0 : getExpression().treeSize())
+ (this.fieldName == null ? 0 : getName().treeSize());
}
}