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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/beans/decoder/MethodFinder.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/beans/decoder/MethodFinder.java')
-rw-r--r-- | libjava/classpath/gnu/java/beans/decoder/MethodFinder.java | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/beans/decoder/MethodFinder.java b/libjava/classpath/gnu/java/beans/decoder/MethodFinder.java new file mode 100644 index 000000000..82783fbde --- /dev/null +++ b/libjava/classpath/gnu/java/beans/decoder/MethodFinder.java @@ -0,0 +1,177 @@ +/* gnu.java.beans.decoder.MethodFinder + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.beans.decoder; + +import java.lang.reflect.Constructor; +import java.lang.reflect.Method; +import java.util.HashMap; + +class MethodFinder +{ + /** Provides a mapping between a wrapper class and its corresponding primitive's type. */ + private static HashMap typeMapping = new HashMap(); + + static { + typeMapping.put(Byte.class, Byte.TYPE); + typeMapping.put(Short.class, Short.TYPE); + typeMapping.put(Integer.class, Integer.TYPE); + typeMapping.put(Long.class, Long.TYPE); + typeMapping.put(Float.class, Float.TYPE); + typeMapping.put(Double.class, Double.TYPE); + + typeMapping.put(Character.class, Character.TYPE); + typeMapping.put(Boolean.class, Boolean.TYPE); + } + + private MethodFinder() + { + } + + /** Searches a Method which can accept the given arguments. + * + * @param klass + * @param name + * @param arguments + * @return + * @throws NoSuchMethodException + */ + static Method getMethod(Class klass, String name, Object[] arguments) + throws NoSuchMethodException + { + // prepares array containing the types of the arguments + Class[] argumentTypes = getArgumentTypes(arguments); + + Method[] methods = klass.getMethods(); + + // iterates over all public methods + for (int i = 0; i < methods.length; i++) + { + if (methods[i].getName().equals(name)) + { + if (matchingArgumentTypes(methods[i].getParameterTypes(), + argumentTypes)) + return methods[i]; + } + } + + throw new NoSuchMethodException( + "Could not find a matching method named " + + name + + "() in class " + + klass); + } + + static Constructor getConstructor(Class klass, Object[] arguments) + throws NoSuchMethodException + { + Class[] argumentTypes = getArgumentTypes(arguments); + Constructor[] constructors = klass.getConstructors(); + + // iterates over all public methods + for (int i = 0; i < constructors.length; i++) + { + if (matchingArgumentTypes(constructors[i].getParameterTypes(), + argumentTypes)) + return constructors[i]; + } + + throw new NoSuchMethodException( + "Could not find a matching constructor in class " + klass); + } + + /** Transforms an array of argument objects into an array of argument types. + * For each argument being null the argument is null, too. An argument type + * being null means: Accepts everything (although this can be ambigous). + * + * @param arguments + * @return + */ + private static Class[] getArgumentTypes(Object[] arguments) + { + if (arguments == null) + return new Class[0]; + + // prepares array containing the types of the arguments + Class[] argumentTypes = new Class[arguments.length]; + for (int i = 0; i < arguments.length; i++) + argumentTypes[i] = + (arguments[i] == null) ? null : arguments[i].getClass(); + return argumentTypes; + } + + /** Tests whether the argument types supplied to the method argument types + * are assignable. In addition to the assignment specifications this method + * handles the primitive's wrapper classes as if they were of their + * primitive type (e.g Boolean.class equals Boolean.TYPE). + * When a supplied argument type is null it is assumed that no argument + * object was supplied for it and the test for this particular parameter will + * pass. + * + * @param methodArgTypes + * @param suppliedArgTypes + * @return + */ + private static boolean matchingArgumentTypes( + Class[] methodArgTypes, + Class[] suppliedArgTypes) + { + if (methodArgTypes.length != suppliedArgTypes.length) + return false; + + for (int i = 0; i < methodArgTypes.length; i++) + { + if (suppliedArgTypes[i] == null) + { + // by definition a non-existant argument type (null) can be converted to everything + continue; + } + else if (typeMapping.containsKey(suppliedArgTypes[i])) + { + Class primitiveType = + (Class) typeMapping.get(suppliedArgTypes[i]); + if (!(methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i]) + || methodArgTypes[i].isAssignableFrom(primitiveType))) + return false; + } + else if (!methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i])) + return false; + } + + return true; + } +} |