| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package java.lang; |
| |
| import static javaemul.internal.InternalPreconditions.checkArrayType; |
| import static javaemul.internal.InternalPreconditions.checkNotNull; |
| import static javaemul.internal.InternalPreconditions.isTypeChecked; |
| |
| import java.io.PrintStream; |
| |
| import javaemul.internal.ArrayHelper; |
| import javaemul.internal.HashCodes; |
| import javaemul.internal.JsUtils; |
| |
| import jsinterop.annotations.JsMethod; |
| |
| /** |
| * General-purpose low-level utility methods. GWT only supports a limited subset |
| * of these methods due to browser limitations. Only the documented methods are |
| * available. |
| */ |
| public final class System { |
| |
| /** |
| * Does nothing in web mode. To get output in web mode, subclass PrintStream |
| * and call {@link #setErr(PrintStream)}. |
| */ |
| public static PrintStream err = new PrintStream(null); |
| |
| /** |
| * Does nothing in web mode. To get output in web mode, subclass |
| * {@link PrintStream} and call {@link #setOut(PrintStream)}. |
| */ |
| public static PrintStream out = new PrintStream(null); |
| |
| public static void arraycopy(Object src, int srcOfs, Object dest, int destOfs, int len) { |
| checkNotNull(src, "src"); |
| checkNotNull(dest, "dest"); |
| |
| Class<?> srcType = src.getClass(); |
| Class<?> destType = dest.getClass(); |
| checkArrayType(srcType.isArray(), "srcType is not an array"); |
| checkArrayType(destType.isArray(), "destType is not an array"); |
| |
| Class<?> srcComp = srcType.getComponentType(); |
| Class<?> destComp = destType.getComponentType(); |
| checkArrayType(arrayTypeMatch(srcComp, destComp), "Array types don't match"); |
| |
| int srclen = ArrayHelper.getLength(src); |
| int destlen = ArrayHelper.getLength(dest); |
| if (srcOfs < 0 || destOfs < 0 || len < 0 || srcOfs + len > srclen || destOfs + len > destlen) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| /* |
| * If the arrays are not references or if they are exactly the same type, we |
| * can copy them in native code for speed. Otherwise, we have to copy them |
| * in Java so we get appropriate errors. |
| */ |
| if (isTypeChecked() && !srcComp.isPrimitive() && !srcType.equals(destType)) { |
| // copy in Java to make sure we get ArrayStoreExceptions if the values |
| // aren't compatible |
| Object[] srcArray = (Object[]) src; |
| Object[] destArray = (Object[]) dest; |
| if (src == dest && srcOfs < destOfs) { |
| // TODO(jat): how does backward copies handle failures in the middle? |
| // copy backwards to avoid destructive copies |
| srcOfs += len; |
| for (int destEnd = destOfs + len; destEnd-- > destOfs;) { |
| destArray[destEnd] = srcArray[--srcOfs]; |
| } |
| } else { |
| for (int destEnd = destOfs + len; destOfs < destEnd;) { |
| destArray[destOfs++] = srcArray[srcOfs++]; |
| } |
| } |
| } else if (len > 0) { |
| ArrayHelper.copy(src, srcOfs, dest, destOfs, len); |
| } |
| } |
| |
| public static long currentTimeMillis() { |
| return (long) JsUtils.getTime(); |
| } |
| |
| /** |
| * Has no effect; just here for source compatibility. |
| * |
| * @skip |
| */ |
| public static void gc() { |
| } |
| |
| /** |
| * The compiler replaces getProperty by the actual value of the property. |
| */ |
| @JsMethod(name = "$getDefine", namespace = "nativebootstrap.Util") |
| public static native String getProperty(String key); |
| |
| /** |
| * The compiler replaces getProperty by the actual value of the property. |
| */ |
| @JsMethod(name = "$getDefine", namespace = "nativebootstrap.Util") |
| public static native String getProperty(String key, String def); |
| |
| public static int identityHashCode(Object o) { |
| return HashCodes.getIdentityHashCode(o); |
| } |
| |
| public static void setErr(PrintStream err) { |
| System.err = err; |
| } |
| |
| public static void setOut(PrintStream out) { |
| System.out = out; |
| } |
| |
| private static boolean arrayTypeMatch(Class<?> srcComp, Class<?> destComp) { |
| if (srcComp.isPrimitive()) { |
| return srcComp.equals(destComp); |
| } else { |
| return !destComp.isPrimitive(); |
| } |
| } |
| } |