org.eclipse.jdt.core.dom.NullLiteral.java Source code

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Here is the source code for org.eclipse.jdt.core.dom.NullLiteral.java

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/*******************************************************************************
 * 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;

/**
 * Null literal node.
 *
 * @since 2.0
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public class NullLiteral extends Expression {

    /**
     * A list of property descriptors (element type:
     * {@link StructuralPropertyDescriptor}),
     * or null if uninitialized.
     */
    private static final List PROPERTY_DESCRIPTORS;

    static {
        List propertyList = new ArrayList(1);
        createPropertyList(NullLiteral.class, propertyList);
        PROPERTY_DESCRIPTORS = 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
     * <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;
    }

    /**
     * Creates a new unparented null literal node owned by the given AST.
     * <p>
     * N.B. This constructor is package-private.
     * </p>
     *
     * @param ast the AST that is to own this node
     */
    NullLiteral(AST ast) {
        super(ast);
    }

    @Override
    final List internalStructuralPropertiesForType(int apiLevel) {
        return propertyDescriptors(apiLevel);
    }

    @Override
    final int getNodeType0() {
        return NULL_LITERAL;
    }

    @Override
    ASTNode clone0(AST target) {
        NullLiteral result = new NullLiteral(target);
        result.setSourceRange(getStartPosition(), getLength());
        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) {
        visitor.visit(this);
        visitor.endVisit(this);
    }

    @Override
    int memSize() {
        return BASE_NODE_SIZE;
    }

    @Override
    int treeSize() {
        return memSize();
    }
}