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Groovy: A powerful, dynamic language for the JVM

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/*
 * 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 groovy.lang;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

public class TracingInterceptor implements Interceptor {

    protected Writer writer = new PrintWriter(System.out);
    private int indent = 0;

    public Writer getWriter() {
        return writer;
    }

    public void setWriter(Writer writer) {
        this.writer = writer;
    }

    public Object beforeInvoke(Object object, String methodName, Object[] arguments) {
        write(object, methodName, arguments, "before");
        indent++ ;
        return null;
    }

    public Object afterInvoke(Object object, String methodName, Object[] arguments, Object result) {
        indent--;
        write(object, methodName, arguments, "after ");
        return result;
    }

    public boolean doInvoke() {
        return true;
    }
    private String indent(){
        StringBuffer result = new StringBuffer();
        for (int i=0; i 0) writer.write(", ");
            Object argument = arguments[i];
            writer.write(argument.getClass().getName());
        }
        writer.write(")");
    }
}