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 26 package jdk.nashorn.tools.jjs; 27 28 import java.io.IOException; 29 import java.util.Collections; 30 import java.util.HashSet; 31 import java.util.Set; 32 import java.util.function.Function; 33 import java.util.function.Supplier; 34 import jdk.internal.jline.console.history.FileHistory; 35 import jdk.internal.jline.console.history.History; 36 import jdk.nashorn.api.scripting.AbstractJSObject; 37 import jdk.nashorn.api.scripting.JSObject; 38 import jdk.nashorn.internal.runtime.JSType; 39 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; 40 41 /* 42 * A script friendly object that exposes history of commands to scripts. 43 */ 44 final class HistoryObject extends AbstractJSObject { 45 private static final Set<String> props; 46 static { 47 final HashSet<String> s = new HashSet<>(); 48 s.add("clear"); 49 s.add("forEach"); 50 s.add("print"); 51 s.add("size"); 52 s.add("toString"); 53 props = Collections.unmodifiableSet(s); 54 } 55 56 private final FileHistory hist; 57 58 HistoryObject(final FileHistory hist) { 59 this.hist = hist; 60 } 61 62 @Override 63 public Object getMember(final String name) { 64 switch (name) { 65 case "clear": 66 return (Runnable)hist::clear; 67 case "forEach": 68 return (Function<JSObject, Object>)this::iterate; 69 case "print": 70 return (Runnable)this::print; 71 case "size": 72 return hist.size(); 73 case "toString": 74 return (Supplier<String>)this::toString; 75 } 76 return UNDEFINED; 77 } 78 79 @Override 80 public Object getDefaultValue(final Class<?> hint) { 81 if (hint == String.class) { 82 return toString(); 83 } 84 return UNDEFINED; 85 } 86 87 @Override 88 public String toString() { 89 final StringBuilder buf = new StringBuilder(); 90 for (History.Entry e : hist) { 91 buf.append(e.value()).append('\n'); 92 } 93 return buf.toString(); 94 } 95 96 @Override 97 public Set<String> keySet() { 98 return props; 99 } 100 101 private void print() { 102 for (History.Entry e : hist) { 103 System.out.println(e.value()); 104 } 105 } 106 107 private Object iterate(final JSObject func) { 108 for (History.Entry e : hist) { 109 if (JSType.toBoolean(func.call(this, e.value().toString()))) { 110 break; // return true from callback to skip iteration 111 } 112 } 113 return UNDEFINED; 114 } 115 }