HistoryObject.java revision 1378:54af83b4a714 
1/*
2 * Copyright (c) 2015, 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.tools.jjs;
27
28import java.io.IOException;
29import java.util.function.Function;
30import jdk.internal.jline.console.history.FileHistory;
31import jdk.internal.jline.console.history.History;
32import jdk.nashorn.api.scripting.AbstractJSObject;
33import jdk.nashorn.api.scripting.JSObject;
34import jdk.nashorn.internal.runtime.JSType;
35import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
36
37/*
38 * A script friendly object that exposes history of commands to scripts.
39 */
40final class HistoryObject extends AbstractJSObject {
41    private final FileHistory hist;
42
43    HistoryObject(final FileHistory hist) {
44        this.hist = hist;
45    }
46
47    @Override
48    public Object getMember(final String name) {
49        switch (name) {
50            case "clear":
51                return (Runnable)hist::clear;
52            case "forEach":
53                return (Function<JSObject, Object>)this::iterate;
54            case "print":
55                return (Runnable)this::print;
56            case "size":
57                return hist.size();
58        }
59        return UNDEFINED;
60    }
61
62    @Override
63    public Object getDefaultValue(final Class<?> hint) {
64        if (hint == String.class) {
65            return toString();
66        }
67        return UNDEFINED;
68    }
69
70    @Override
71    public String toString() {
72        return "[object history]";
73    }
74
75    private void print() {
76        for (History.Entry e : hist) {
77            System.out.println(e.value());
78        }
79    }
80
81    private Object iterate(final JSObject func) {
82        for (History.Entry e : hist) {
83            if (JSType.toBoolean(func.call(this, e.value().toString()))) {
84                break; // return true from callback to skip iteration
85            }
86        }
87        return UNDEFINED;
88    }
89}
90