org.I0Itec.zkclient.util.ZkPathUtil Maven / Gradle / Ivy

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A zookeeper client, that makes life a little easier.
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/**
 * Copyright 2010 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 org.I0Itec.zkclient.util;

import java.util.List;

import org.I0Itec.zkclient.ZkClient;

public class ZkPathUtil {

    public static String leadingZeros(long number, int numberOfLeadingZeros) {
        return String.format("%0" + numberOfLeadingZeros + "d", number);
    }

    public static String toString(ZkClient zkClient) {
        return toString(zkClient, "/", PathFilter.ALL);
    }

    public static String toString(ZkClient zkClient, String startPath, PathFilter pathFilter) {
        final int level = 1;
        final StringBuilder builder = new StringBuilder("+ (" + startPath + ")");
        builder.append("\n");
        addChildrenToStringBuilder(zkClient, pathFilter, level, builder, startPath);
        return builder.toString();
    }

    private static void addChildrenToStringBuilder(ZkClient zkClient, PathFilter pathFilter, final int level, final StringBuilder builder, final String startPath) {
        final List children = zkClient.getChildren(startPath);
        for (final String node : children) {
            String nestedPath;
            if (startPath.endsWith("/")) {
                nestedPath = startPath + node;
            } else {
                nestedPath = startPath + "/" + node;
            }
            if (pathFilter.showChilds(nestedPath)) {
                builder.append(getSpaces(level - 1) + "'-" + "+" + node + "\n");
                addChildrenToStringBuilder(zkClient, pathFilter, level + 1, builder, nestedPath);
            } else {
                builder.append(getSpaces(level - 1) + "'-" + "-" + node + " (contents hidden)\n");
            }
        }
    }

    private static String getSpaces(final int level) {
        String s = "";
        for (int i = 0; i < level; i++) {
            s += "  ";
        }
        return s;
    }

    public static interface PathFilter {

        public static PathFilter ALL = new PathFilter() {

            @Override
            public boolean showChilds(String path) {
                return true;
            }
        };

        boolean showChilds(String path);
    }

}