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56 lines
2 KiB
Java
56 lines
2 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.base.Preconditions.checkArgument;
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import static com.google.common.base.Strings.isNullOrEmpty;
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import com.google.common.collect.ImmutableList;
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import java.util.Collection;
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/** String generator. */
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public abstract class StringGenerator {
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/** A class containing different alphabets used to generate strings. */
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public static class Alphabets {
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/** A URL-safe Base64 alphabet (alphanumeric, hyphen, underscore). */
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public static final String BASE_64 =
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"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-";
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/** An alphanumeric alphabet that omits visually similar characters. */
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public static final String BASE_58 =
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"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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}
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protected String alphabet;
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protected StringGenerator(String alphabet) {
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checkArgument(!isNullOrEmpty(alphabet), "Alphabet cannot be null or empty.");
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this.alphabet = alphabet;
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}
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/** Generates a string of a specified length. */
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public abstract String createString(int length);
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/** Batch-generates an {@link ImmutableList} of strings of a specified length. */
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public Collection<String> createStrings(int length, int count) {
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ImmutableList.Builder<String> listBuilder = new ImmutableList.Builder<>();
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for (int i = 0; i < count; i++) {
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listBuilder.add(createString(length));
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}
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return listBuilder.build();
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}
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}
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