CircularDependency.java

/*
 * Copyright 2014 Avanza Bank AB
 *
 * 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 com.avanza.astrix.beans.factory;

import java.util.Stack;

import com.avanza.astrix.beans.core.AstrixBeanKey;



/**
 * 
 * @author Elias Lindholm (elilin)
 *
 */
public class CircularDependency extends RuntimeException {

	private static final long serialVersionUID = 1L;

	public CircularDependency(Stack<AstrixBeanKey<?>> trace) {
		super("Circular dependency detected, dependency tree:\n" + createTrace(trace));
	}

	private static String createTrace(Stack<AstrixBeanKey<?>> trace) {
		StringBuilder result = new StringBuilder();
		StringBuilder indent = new StringBuilder();
		for (AstrixBeanKey<?> key : trace) {
			result.append(indent.toString()).append(key).append("\n");
			indent.append("  ");
		}
		return result.toString();
	}

}