cc.kave.commons.model.groum.comparator.Path.java Source code

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Here is the source code for cc.kave.commons.model.groum.comparator.Path.java

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/**
 * Copyright 2016 Technische Universitt Darmstadt
 * 
 * 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 cc.kave.commons.model.groum.comparator;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import cc.kave.commons.model.groum.Node;

class Path implements Comparable<Path> {
    private final List<Node> path;

    public Path(Node... nodes) {
        this(Arrays.asList(nodes));
    }

    private Path(List<Node> path) {
        this.path = path;
    }

    public Path getExtension(Node node) {
        List<Node> extension = new LinkedList<>(path);
        extension.add(node);
        return new Path(extension);
    }

    public Path getTail() {
        LinkedList<Node> tail = new LinkedList<>(path);
        if (!tail.isEmpty())
            tail.removeFirst();
        return new Path(tail);
    }

    public boolean isEmpty() {
        return path.isEmpty();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result
                + ((path == null) ? 0 : path.stream().mapToInt(node -> node.getId().hashCode()).sum());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Path other = (Path) obj;
        return compareTo(other) == 0;
    }

    @Override
    public int compareTo(Path other) {
        int sizeCompare = Integer.compare(path.size(), other.path.size());
        if (sizeCompare != 0) {
            return sizeCompare;
        }
        for (int i = 0; i < path.size(); i++) {
            int nodeCompare = path.get(i).compareTo(other.path.get(i));
            if (nodeCompare != 0) {
                return nodeCompare;
            }
        }
        return 0;
    }

    @Override
    public String toString() {
        return "(" + StringUtils.join(path, "-") + ")";
    }
}