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Groovy example source code file (MethodSelectionException.java)

This example Groovy source code file (MethodSelectionException.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

cachedconstructor, class, class, could, fastarray, fastarray, groovyruntimeexception, metamethod, metamethod, methodselectionexception, object, reflection, string, string, stringbuffer

The Groovy MethodSelectionException.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.codehaus.groovy.runtime.metaclass;

import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.reflection.CachedConstructor;
import org.codehaus.groovy.util.FastArray;

import java.lang.reflect.Modifier;

/**
 * This exception is thrown if the runtime is unable to select
 * a method. This class builds the exception text when calling 
 * getMessage. <br/>
 * <b>Note: This exception as for internal use only!
 * 
 * @author Jochen Theodorou
 * @since Groovy 1.1
 */
public class MethodSelectionException extends GroovyRuntimeException {

    private final String methodName;
    private final FastArray methods;
    private final Class[] arguments;
    
    /**
     * Creates a new MethodSelectionException.
     * @param methodName name of the method
     * @param methods    a FastArray of methods
     * @param arguments  the method call argument classes
     */
    public MethodSelectionException(String methodName, FastArray methods, Class[] arguments) {
        super(methodName);
        this.methodName = methodName;
        this.arguments = arguments;
        this.methods = methods;
    }

    public String getMessage() {
        StringBuffer buffer = new StringBuffer();
        buffer.append("Could not find which method ").append(methodName);
        appendClassNames(buffer,arguments);
        buffer.append(" to invoke from this list:");
        appendMethods(buffer);
        return buffer.toString();
    }
    
    
    private void appendClassNames(StringBuffer argBuf, Class[] classes) {
        argBuf.append("(");
        for (int i = 0; i < classes.length; i++) {
            if (i > 0) {
                argBuf.append(", ");
            }
            Class clazz = classes[i];
            String name = clazz==null? "null": clazz.getName();
            argBuf.append(name);
        }
        argBuf.append(")");
    }
    
    private void appendMethods(StringBuffer buffer) {
        for (int i = 0; i < methods.size; i++) {
            buffer.append("\n  ");
            Object methodOrConstructor = methods.get(i);
            if (methodOrConstructor instanceof MetaMethod) {
                MetaMethod method = (MetaMethod) methodOrConstructor;
                buffer.append(Modifier.toString(method.getModifiers()));
                buffer.append(" ").append(method.getReturnType().getName());
                buffer.append(" ").append(method.getDeclaringClass().getName());
                buffer.append("#");
                buffer.append(method.getName());
                appendClassNames(buffer,method.getNativeParameterTypes());
            }
            else {
                CachedConstructor method = (CachedConstructor) methodOrConstructor;
                buffer.append(Modifier.toString(method.cachedConstructor.getModifiers()));
                buffer.append(" ").append(method.cachedConstructor.getDeclaringClass().getName());
                buffer.append("#<init>");
                appendClassNames(buffer,method.getNativeParameterTypes());
            }
        }
    }
}

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