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 non-overloaded methods.
072: * @author Attila Szegedi, szegedia at users dot sourceforge dot net
073: * @version $Id: SimpleMethodModel.java,v 1.27 2005/06/11 12:12:04 szegedia Exp $
074: */
075: final class SimpleMethodModel implements TemplateMethodModelEx,
076: TemplateSequenceModel {
077: private final Object object;
078: private final Method method;
079: private final Class[] argTypes;
080: private final BeansWrapper wrapper;
081:
082: /**
083: * Creates a model for a specific method on a specific object.
084: * @param object the object to call the method on. Can be
085: * <tt>null</tt> for static methods.
086: * @param method the method that will be invoked.
087: */
088: SimpleMethodModel(Object object, Method method, Class[] argTypes,
089: BeansWrapper wrapper) {
090: this .object = object;
091: this .method = method;
092: this .argTypes = argTypes;
093: this .wrapper = wrapper;
094: }
095:
096: /**
097: * Invokes the method, passing it the arguments from the list.
098: */
099: public Object exec(List arguments) throws TemplateModelException {
100: try {
101: Object[] args = wrapper
102: .unwrapArguments(arguments, argTypes);
103: if (args != null) {
104: BeansWrapper.coerceBigDecimals(method, args);
105: }
106: return wrapper.invokeMethod(object, method, args);
107: } catch (Exception e) {
108: while (e instanceof InvocationTargetException) {
109: Throwable t = ((InvocationTargetException) e)
110: .getTargetException();
111: if (t instanceof Exception) {
112: e = (Exception) t;
113: } else {
114: break;
115: }
116: }
117: if ((method.getModifiers() & Modifier.STATIC) != 0) {
118: throw new TemplateModelException("Method " + method
119: + " threw an exception", e);
120: } else {
121: throw new TemplateModelException("Method " + method
122: + " threw an exception when invoked on "
123: + object, e);
124: }
125: }
126: }
127:
128: public TemplateModel get(int index) throws TemplateModelException {
129: return (TemplateModel) exec(Collections12
130: .singletonList(new SimpleNumber(new Integer(index))));
131: }
132:
133: public int size() throws TemplateModelException {
134: throw new TemplateModelException("?size is unsupported for: "
135: + getClass().getName());
136: }
137: }
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