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| 1 | +/* | |
| 2 | + * Copyright (c) 2008, 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 | +package com.sun.beans.decoder; | |
| 26 | + | |
| 27 | +import com.sun.beans.finder.MethodFinder; | |
| 28 | + | |
| 29 | +import java.lang.reflect.Method; | |
| 30 | + | |
| 31 | +/** | |
| 32 | + * This class is intended to handle <method> element. | |
| 33 | + * It describes invocation of the method. | |
| 34 | + * The {@code name} attribute denotes | |
| 35 | + * the name of the method to invoke. | |
| 36 | + * If the {@code class} attribute is specified | |
| 37 | + * this element invokes static method of specified class. | |
| 38 | + * The inner elements specifies the arguments of the method. | |
| 39 | + * For example:<pre> | |
| 40 | + * <method name="valueOf" class="java.lang.Long"> | |
| 41 | + * <string>10</string> | |
| 42 | + * </method></pre> | |
| 43 | + * is equivalent to {@code Long.valueOf("10")} in Java code. | |
| 44 | + * <p>The following atributes are supported: | |
| 45 | + * <dl> | |
| 46 | + * <dt>name | |
| 47 | + * <dd>the method name | |
| 48 | + * <dt>class | |
| 49 | + * <dd>the type of object for instantiation | |
| 50 | + * <dt>id | |
| 51 | + * <dd>the identifier of the variable that is intended to store the result | |
| 52 | + * </dl> | |
| 53 | + * | |
| 54 | + * @since 1.7 | |
| 55 | + * | |
| 56 | + * @author Sergey A. Malenkov | |
| 57 | + */ | |
| 58 | +final class MethodElementHandler extends NewElementHandler { | |
| 59 | + private String name; | |
| 60 | + | |
| 61 | + /** | |
| 62 | + * Parses attributes of the element. | |
| 63 | + * The following atributes are supported: | |
| 64 | + * <dl> | |
| 65 | + * <dt>name | |
| 66 | + * <dd>the method name | |
| 67 | + * <dt>class | |
| 68 | + * <dd>the type of object for instantiation | |
| 69 | + * <dt>id | |
| 70 | + * <dd>the identifier of the variable that is intended to store the result | |
| 71 | + * </dl> | |
| 72 | + * | |
| 73 | + * @param name the attribute name | |
| 74 | + * @param value the attribute value | |
| 75 | + */ | |
| 76 | + @Override | |
| 77 | + public void addAttribute(String name, String value) { | |
| 78 | + if (name.equals("name")) { // NON-NLS: the attribute name | |
| 79 | + this.name = value; | |
| 80 | + } else { | |
| 81 | + super.addAttribute(name, value); | |
| 82 | + } | |
| 83 | + } | |
| 84 | + | |
| 85 | + /** | |
| 86 | + * Returns the result of method execution. | |
| 87 | + * | |
| 88 | + * @param type the base class | |
| 89 | + * @param args the array of arguments | |
| 90 | + * @return the value of this element | |
| 91 | + * @throws Exception if calculation is failed | |
| 92 | + */ | |
| 93 | + @Override | |
| 94 | + protected ValueObject getValueObject(Class<?> type, Object[] args) throws Exception { | |
| 95 | + Object bean = getContextBean(); | |
| 96 | + Class<?>[] types = getArgumentTypes(args); | |
| 97 | + Method method = (type != null) | |
| 98 | + ? MethodFinder.findStaticMethod(type, this.name, types) | |
| 99 | + : MethodFinder.findMethod(bean.getClass(), this.name, types); | |
| 100 | + | |
| 101 | + if (method.isVarArgs()) { | |
| 102 | + args = getArguments(args, method.getParameterTypes()); | |
| 103 | + } | |
| 104 | + Object value = method.invoke(bean, args); | |
| 105 | + return method.getReturnType().equals(void.class) | |
| 106 | + ? ValueObjectImpl.VOID | |
| 107 | + : ValueObjectImpl.create(value); | |
| 108 | + } | |
| 109 | +} | |