CycleDetectedException.java

package org.codehaus.plexus.util.dag;

/*
 * Copyright The Codehaus Foundation.
 *
 * 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.
 */

import java.util.Iterator;
import java.util.List;

public class CycleDetectedException extends Exception {
    private List<String> cycle;

    public CycleDetectedException(final String message, final List<String> cycle) {
        super(message);

        this.cycle = cycle;
    }

    public List<String> getCycle() {
        return cycle;
    }

    public String cycleToString() {
        final StringBuilder buffer = new StringBuilder();

        for (Iterator<String> iterator = cycle.iterator(); iterator.hasNext(); ) {
            buffer.append(iterator.next());

            if (iterator.hasNext()) {
                buffer.append(" --> ");
            }
        }
        return buffer.toString();
    }

    @Override
    public String getMessage() {
        return super.getMessage() + " " + cycleToString();
    }
}