001: /*
002: $Id: MethodCaller.java 2223 2005-05-27 10:13:49Z russel $
003:
004: Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:
006: Redistribution and use of this software and associated documentation
007: ("Software"), with or without modification, are permitted provided
008: that the following conditions are met:
009:
010: 1. Redistributions of source code must retain copyright
011: statements and notices. Redistributions must also contain a
012: copy of this document.
013:
014: 2. Redistributions in binary form must reproduce the
015: above copyright notice, this list of conditions and the
016: following disclaimer in the documentation and/or other
017: materials provided with the distribution.
018:
019: 3. The name "groovy" must not be used to endorse or promote
020: products derived from this Software without prior written
021: permission of The Codehaus. For written permission,
022: please contact info@codehaus.org.
023:
024: 4. Products derived from this Software may not be called "groovy"
025: nor may "groovy" appear in their names without prior written
026: permission of The Codehaus. "groovy" is a registered
027: trademark of The Codehaus.
028:
029: 5. Due credit should be given to The Codehaus -
030: http://groovy.codehaus.org/
031:
032: THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033: ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034: NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035: FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
036: THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043: OF THE POSSIBILITY OF SUCH DAMAGE.
044:
045: */
046: package org.codehaus.groovy.classgen;
047:
048: import java.lang.reflect.Method;
049:
050: import org.objectweb.asm.MethodVisitor;
051: import org.objectweb.asm.Opcodes;
052: import org.objectweb.asm.Type;
053:
054: /**
055: * A helper class to invoke methods more easily in ASM
056: *
057: * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
058: * @version $Revision: 2223 $
059: */
060: public class MethodCaller implements Opcodes {
061:
062: private int opcode;
063: private String internalName;
064: private String name;
065: private Class theClass;
066: private String methodDescriptor;
067:
068: public static MethodCaller newStatic(Class theClass, String name) {
069: return new MethodCaller(INVOKESTATIC, theClass, name);
070: }
071:
072: public static MethodCaller newInterface(Class theClass, String name) {
073: return new MethodCaller(INVOKEINTERFACE, theClass, name);
074: }
075:
076: public static MethodCaller newVirtual(Class theClass, String name) {
077: return new MethodCaller(INVOKEVIRTUAL, theClass, name);
078: }
079:
080: public MethodCaller(int opcode, Class theClass, String name) {
081: this .opcode = opcode;
082: this .internalName = Type.getInternalName(theClass);
083: this .theClass = theClass;
084: this .name = name;
085:
086: }
087:
088: public void call(MethodVisitor methodVisitor) {
089: methodVisitor.visitMethodInsn(opcode, internalName, name,
090: getMethodDescriptor());
091: }
092:
093: public String getMethodDescriptor() {
094: if (methodDescriptor == null) {
095: Method method = getMethod();
096: methodDescriptor = Type.getMethodDescriptor(method);
097: }
098: return methodDescriptor;
099: }
100:
101: protected Method getMethod() {
102: Method[] methods = theClass.getMethods();
103: for (int i = 0; i < methods.length; i++) {
104: Method method = methods[i];
105: if (method.getName().equals(name)) {
106: return method;
107: }
108: }
109: throw new ClassGeneratorException("Could not find method: "
110: + name + " on class: " + theClass);
111: }
112: }
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