+++ /dev/null
-/*******************************************************************************
- * 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.
- *
- * <pre>
- * FieldAccess:
- * Expression <b>.</b> Identifier
- * </pre>
- *
- * <p>
- * 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:
- * <ul>
- * <li>An expression like "foo.this" can only be represented as a this
- * expression (<code>ThisExpression</code>) containing a simple name.
- * "this" is a keyword, and therefore invalid as an identifier.</li>
- * <li>An expression like "this.foo" can only be represented as a field
- * access expression (<code>FieldAccess</code>) containing a this expression
- * and a simple name. Again, this is because "this" is a keyword, and
- * therefore invalid as an identifier.</li>
- * <li>An expression with "super" can only be represented as a super field
- * access expression (<code>SuperFieldAccess</code>). "super" is a also
- * keyword, and therefore invalid as an identifier.</li>
- * <li>An expression like "foo.bar" can be represented either as a
- * qualified name (<code>QualifiedName</code>) or as a field access
- * expression (<code>FieldAccess</code>) containing simple names. Either
- * is acceptable, and there is no way to choose between them without
- * information about what the names resolve to
- * (<code>ASTParser</code> may return either).</li>
- * <li>Other expressions ending in an identifier, such as "foo().bar" can
- * only be represented as field access expressions
- * (<code>FieldAccess</code>).</li>
- * </ul>
- * </p>
- *
- * @see QualifiedName
- * @see ThisExpression
- * @see SuperFieldAccess
- * @since 2.0
- * @noinstantiate This class is not intended to be instantiated by clients.
- */
-public class FieldAccess extends Expression {
-
- /**
- * The "expression" structural property of this node type.
- * @since 3.0
- */
- public static final ChildPropertyDescriptor EXPRESSION_PROPERTY =
- new ChildPropertyDescriptor(FieldAccess.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
-
- /**
- * The "name" structural property of this node type.
- * @since 3.0
- */
- public static final ChildPropertyDescriptor NAME_PROPERTY =
- new ChildPropertyDescriptor(FieldAccess.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;
-
- static {
- List properyList = new ArrayList(3);
- createPropertyList(FieldAccess.class, properyList);
- addProperty(EXPRESSION_PROPERTY, properyList);
- addProperty(NAME_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 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.
- * <p>
- * N.B. This constructor is package-private.
- * </p>
- *
- * @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:
- * <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 name of the field accessed in this field access expression.
- *
- * @return the field name
- */
- public SimpleName getName() {
- if (this.fieldName == null) {
- // lazy init must be thread-safe for readers
- synchronized (this) {
- if (this.fieldName == null) {
- preLazyInit();
- this.fieldName = new SimpleName(this.ast);
- postLazyInit(this.fieldName, NAME_PROPERTY);
- }
- }
- }
- return this.fieldName;
- }
-
- /**
- * Sets the name of the field accessed in this field access expression.
- *
- * @param fieldName the field 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 fieldName) {
- if (fieldName == null) {
- throw new IllegalArgumentException();
- }
- ASTNode oldChild = this.fieldName;
- preReplaceChild(oldChild, fieldName, NAME_PROPERTY);
- this.fieldName = fieldName;
- postReplaceChild(oldChild, fieldName, NAME_PROPERTY);
- }
-
- /* (omit javadoc for this method)
- * Method declared on ASTNode.
- */
- int memSize() {
- // treat Code as free
- return BASE_NODE_SIZE + 2 * 4;
- }
-
- /**
- * Resolves and returns the binding for the field accessed by this
- * expression.
- * <p>
- * Note that bindings are generally unavailable unless requested when the
- * AST is being built.
- * </p>
- *
- * @return the variable binding, or <code>null</code> 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());
- }
-}
-
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