ObjectNode.java revision 953:221a84ef44c0 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.nashorn.internal.ir;
27
28import java.util.Collections;
29import java.util.List;
30import java.util.function.Function;
31import jdk.nashorn.internal.codegen.types.Type;
32import jdk.nashorn.internal.ir.annotations.Immutable;
33import jdk.nashorn.internal.ir.visitor.NodeVisitor;
34
35/**
36 * IR representation of an object literal.
37 */
38@Immutable
39public final class ObjectNode extends Expression {
40
41    /** Literal elements. */
42    private final List<PropertyNode> elements;
43
44    /**
45     * Constructor
46     *
47     * @param token    token
48     * @param finish   finish
49     * @param elements the elements used to initialize this ObjectNode
50     */
51    public ObjectNode(final long token, final int finish, final List<PropertyNode> elements) {
52        super(token, finish);
53        this.elements = elements;
54    }
55
56    private ObjectNode(final ObjectNode objectNode, final List<PropertyNode> elements) {
57        super(objectNode);
58        this.elements = elements;
59    }
60
61    @Override
62    public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
63        if (visitor.enterObjectNode(this)) {
64            return visitor.leaveObjectNode(setElements(Node.accept(visitor, elements)));
65        }
66
67        return this;
68    }
69
70    @Override
71    public Type getType(final Function<Symbol, Type> localVariableTypes) {
72        return Type.OBJECT;
73    }
74
75    @Override
76    public void toString(final StringBuilder sb, final boolean printType) {
77        sb.append('{');
78
79        if (!elements.isEmpty()) {
80            sb.append(' ');
81
82            boolean first = true;
83            for (final Node element : elements) {
84                if (!first) {
85                    sb.append(", ");
86                }
87                first = false;
88
89                element.toString(sb, printType);
90            }
91            sb.append(' ');
92        }
93
94        sb.append('}');
95    }
96
97    /**
98     * Get the elements of this literal node
99     * @return a list of elements
100     */
101    public List<PropertyNode> getElements() {
102        return Collections.unmodifiableList(elements);
103    }
104
105    private ObjectNode setElements(final List<PropertyNode> elements) {
106        if (this.elements == elements) {
107            return this;
108        }
109        return new ObjectNode(this, elements);
110    }
111}
112