001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.ext.beans;
054:
055: import java.lang.reflect.InvocationTargetException;
056: import java.lang.reflect.Method;
057: import java.lang.reflect.Modifier;
058: import java.util.List;
059:
060: import freemarker.template.SimpleNumber;
061: import freemarker.template.TemplateMethodModelEx;
062: import freemarker.template.TemplateModel;
063: import freemarker.template.TemplateModelException;
064: import freemarker.template.TemplateSequenceModel;
065: import freemarker.template.utility.Collections12;
066:
067: /**
068: * A class that will wrap a reflected method call into a
069: * {@link freemarker.template.TemplateMethodModel} interface.
070: * It is used by {@link BeanModel} to wrap reflected method calls
071: * for overloaded methods.
072: * @author Attila Szegedi, szegedia at users dot sourceforge dot net
073: * @version $Id: OverloadedMethodModel.java,v 1.25 2005/06/11 12:12:04 szegedia Exp $
074: */
075: class OverloadedMethodModel implements TemplateMethodModelEx,
076: TemplateSequenceModel {
077: private final Object object;
078: private final MethodMap methodMap;
079: private final BeansWrapper wrapper;
080:
081: public OverloadedMethodModel(Object object, MethodMap methodMap,
082: BeansWrapper wrapper) {
083: this .object = object;
084: this .methodMap = methodMap;
085: this .wrapper = wrapper;
086: }
087:
088: /**
089: * Invokes the method, passing it the arguments from the list. The actual
090: * method to call from several overloaded methods will be chosen based
091: * on the classes of the arguments.
092: * @throws TemplateModelException if the method cannot be chosen
093: * unambiguously.
094: */
095: public Object exec(List arguments) throws TemplateModelException {
096: Object[] args = wrapper.unwrapArguments(arguments, methodMap
097: .getUnwrapTypes(arguments));
098: Method method = (Method) methodMap.getMostSpecific(args);
099: if (args != null) {
100: BeansWrapper.coerceBigDecimals(method, args);
101: }
102: try {
103: return wrapper.invokeMethod(object, method, args);
104: } catch (Exception e) {
105: while (e instanceof InvocationTargetException) {
106: Throwable t = ((InvocationTargetException) e)
107: .getTargetException();
108: if (t instanceof Exception) {
109: e = (Exception) t;
110: } else {
111: break;
112: }
113: }
114: if ((method.getModifiers() & Modifier.STATIC) != 0) {
115: throw new TemplateModelException("Method " + method
116: + " threw an exception", e);
117: } else {
118: throw new TemplateModelException("Method " + method
119: + " threw an exception when invoked on "
120: + object, e);
121: }
122: }
123: }
124:
125: public TemplateModel get(int index) throws TemplateModelException {
126: return (TemplateModel) exec(Collections12
127: .singletonList(new SimpleNumber(new Integer(index))));
128: }
129:
130: public int size() throws TemplateModelException {
131: throw new TemplateModelException("?size is unsupported for: "
132: + getClass().getName());
133: }
134: }
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