dev.haeusler.mojo.CircularDefinitionPreventer Maven / Gradle / Ivy

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Properties Maven Plugin with Jasypt support

There is a newer version: 1.2

package dev.haeusler.mojo;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.*;

class CircularDefinitionPreventer {
    private final List entriesVisited = new LinkedList<>();
    private final Set keysUsed = new HashSet<>();

    /**
     * @param key   The key.
     * @param value The values.
     * @return {@link CircularDefinitionPreventer}
     */
    public CircularDefinitionPreventer visited(String key, String value) {
        entriesVisited.add(new VisitedProperty(key, value));
        if (keysUsed.contains(key)) {
            circularDefinition();
        } else {
            keysUsed.add(key);
        }

        return this;
    }

    private void circularDefinition() {
        StringBuilder buffer = new StringBuilder("Circular property definition: ");
        for (Iterator iterator = entriesVisited.iterator(); iterator.hasNext(); ) {
            VisitedProperty visited = (VisitedProperty) iterator.next();
            buffer.append(visited.key).append("=").append(visited.value);
            if (iterator.hasNext()) {
                buffer.append(" -> ");
            }
        }
        throw new IllegalArgumentException(buffer.toString());
    }

    private static class VisitedProperty {
        private final String key;

        private final String value;

        private VisitedProperty(String key, String value) {
            this.key = key;
            this.value = value;
        }
    }
}