azkaban.serialization.Verifier.java Source code

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Here is the source code for azkaban.serialization.Verifier.java

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/*
 * Copyright 2010 LinkedIn, Inc
 * 
 * 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 azkaban.serialization;

import org.joda.time.DateTime;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 *
 */
public class Verifier {
    public static final void verifyKeysExist(Map<String, Object> descriptor, String... keys) {
        List<String> nonExistentKeys = new ArrayList<String>();

        for (String key : keys) {
            if (!descriptor.containsKey(key)) {
                nonExistentKeys.add(key);
            }
        }

        if (!nonExistentKeys.isEmpty()) {
            throw new RuntimeException(
                    String.format("Keys[%s] are required in descriptor[%s]", nonExistentKeys, descriptor));
        }
    }

    public static final <T> T getVerifiedObject(Map<String, Object> descriptor, String key,
            Class<T> expectedClass) {
        Object obj = descriptor.get(key);

        if (obj == null) {
            throw new RuntimeException(
                    String.format("Key[%s] is required as a %s on descriptor[%s]", key, expectedClass, descriptor));
        }

        if (expectedClass.isAssignableFrom(obj.getClass())) {
            return expectedClass.cast(obj);
        } else {
            throw new RuntimeException(
                    String.format("Key[%s] was a %s, but should have been a %s on descriptor[%s]", key,
                            obj.getClass(), expectedClass, descriptor));
        }
    }

    public static final <T> T getOptionalObject(Map<String, Object> descriptor, String key,
            Class<T> expectedClass) {
        Object obj = descriptor.get(key);

        if (obj == null) {
            return null;
        }

        if (expectedClass.isAssignableFrom(obj.getClass())) {
            return expectedClass.cast(obj);
        } else {
            throw new RuntimeException(
                    String.format("Key[%s] was a %s, but should have been a %s on descriptor[%s]", key,
                            obj.getClass(), expectedClass, descriptor));
        }
    }

    public static final <T> T getVerifiedObject(List<Object> descriptor, int index, Class<T> expectedClass) {
        if (index < 0) {
            throw new RuntimeException("How about a non-negative index?  Got " + index);
        }

        if (descriptor.size() >= index) {
            throw new RuntimeException(String.format("Index[%s] is too large for list[%s]", index, descriptor));
        }

        Object obj = descriptor.get(index);

        if (expectedClass.isAssignableFrom(obj.getClass())) {
            return expectedClass.cast(obj);
        } else {
            throw new RuntimeException(
                    String.format("Object at index[%s] was a %s, but should have been a %s on list[%s]", index,
                            obj.getClass(), expectedClass, descriptor));
        }
    }

    public static final boolean equals(Object lhs, Object rhs) {
        if (lhs == null || rhs == null) {
            return rhs == lhs;
        }
        if (lhs instanceof Map && rhs instanceof Map) {
            return equals((Map) lhs, (Map) rhs);
        } else if (lhs instanceof List && rhs instanceof List) {
            return equals((List) lhs, (List) rhs);
        } else {
            return lhs.toString().equals(rhs.toString());
        }
    }

    public static final boolean equals(Map<String, Object> lhs, Map<String, Object> rhs) {
        if (lhs.size() != rhs.size()) {
            return false;
        }

        for (Map.Entry<String, Object> entry : lhs.entrySet()) {
            if (!rhs.containsKey(entry.getKey())) {
                return false;
            }

            if (!equals(entry.getValue(), rhs.get(entry.getKey()))) {
                return false;
            }
        }

        return true;
    }

    public static final boolean equals(List<Object> lhs, List<Object> rhs) {
        if (lhs.size() != rhs.size()) {
            return false;
        }

        final Iterator<Object> lhsIter = lhs.iterator();
        final Iterator<Object> rhsIter = rhs.iterator();
        while (lhsIter.hasNext()) {
            if (!equals(lhsIter.next(), rhsIter.next())) {
                return false;
            }
        }

        return true;
    }

    public static String getString(Map<String, Object> descriptor, String key) {
        Object obj = descriptor.get(key);

        if (obj == null) {
            throw new RuntimeException(
                    String.format("Key[%s] is required as a String on descriptor[%s]", key, descriptor));
        }

        return obj.toString();
    }

    public static DateTime getOptionalDateTime(Map<String, Object> descriptor, String key) {
        Object obj = descriptor.get(key);

        if (obj == null) {
            return null;
        }

        return new DateTime(obj.toString());
    }

    public static <T extends Enum> T getEnumType(Map<String, Object> descriptor, String key, Class<T> enumType) {
        String enumString = getString(descriptor, key);

        try {
            return (T) Enum.valueOf(enumType, enumString);
        } catch (IllegalArgumentException e) {
            throw new RuntimeException(
                    String.format("Unknown enumeration value[%s] on enum[%s].", enumString, enumType));
        }
    }
}