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1 /*
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2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 */
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23
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24 package sun.jvm.hotspot.utilities.soql;
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25
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26 import java.lang.reflect.Method;
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27 import javax.script.ScriptException;
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28
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29 /**
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30 * An implementation of Callable interface that
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31 * invokes an instance or static Java method when
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32 * called.
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33 */
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34 public class MethodCallable implements Callable {
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35 private Object target;
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36 private Method method;
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37 private boolean wrapArgs;
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38
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39 // "wrapArgs" tells whether the underlying java Method
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40 // accepts one Object[] argument or it wants usual way of
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41 // passing arguments. The former method is used when you
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42 // want to implement a Callable that is variadic.
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43 public MethodCallable(Object target, Method method, boolean wrapArgs) {
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44 this.method = method;
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45 this.target = target;
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46 this.wrapArgs = wrapArgs;
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47 }
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48
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49 public MethodCallable(Object target, Method method) {
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50 this(target, method, true);
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51 }
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52
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53 public Object call(Object[] args) throws ScriptException {
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54 try {
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55 if (wrapArgs) {
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56 return method.invoke(target, new Object[] { args });
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57 } else {
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58 return method.invoke(target, args);
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59 }
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60 } catch (RuntimeException re) {
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61 throw re;
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62 } catch (Exception exp) {
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63 throw new ScriptException(exp);
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64 }
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65 }
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66 }
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