com.google.gcloud.datastore.Validator.java Source code

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Here is the source code for com.google.gcloud.datastore.Validator.java

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/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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 com.google.gcloud.datastore;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.common.base.Strings;

import java.util.regex.Pattern;

/**
 * Utility to validate Datastore type/values.
 */
final class Validator {

    private static final Pattern PROJECT_ID_PATTERN = Pattern
            .compile("([a-z\\d\\-]{1,100}~)?([a-z\\d][a-z\\d\\-\\.]{0,99}:)?([a-z\\d][a-z\\d\\-]{0,99})");
    private static final int MAX_NAMESPACE_LENGTH = 100;
    private static final Pattern NAMESPACE_PATTERN = Pattern
            .compile(String.format("[0-9A-Za-z\\._\\-]{0,%d}", MAX_NAMESPACE_LENGTH));

    private Validator() {
        // utility class
    }

    static String validateDatabase(String projectId) {
        checkArgument(!Strings.isNullOrEmpty(projectId), "projectId can't be empty or null");
        checkArgument(PROJECT_ID_PATTERN.matcher(projectId).matches(),
                "projectId must match the following pattern: " + PROJECT_ID_PATTERN.pattern());
        return projectId;
    }

    static String validateNamespace(String namespace) {
        if (namespace != null) {
            checkArgument(!namespace.isEmpty(), "namespace must not be an empty string");
            checkArgument(namespace.length() <= MAX_NAMESPACE_LENGTH,
                    "namespace must not contain more than 100 characters");
            checkArgument(NAMESPACE_PATTERN.matcher(namespace).matches(),
                    "namespace must the following pattern: " + NAMESPACE_PATTERN.pattern());
        }
        return namespace;
    }

    static String validateKind(String kind) {
        checkArgument(!Strings.isNullOrEmpty(kind), "kind must not be empty or null");
        return kind;
    }

}