info.archinnov.achilles.internal.metadata.holder.ClusteringComponents.java Source code

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Here is the source code for info.archinnov.achilles.internal.metadata.holder.ClusteringComponents.java

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/*
 * Copyright (C) 2012-2014 DuyHai DOAN
 *
 *  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 info.archinnov.achilles.internal.metadata.holder;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import info.archinnov.achilles.exception.AchillesException;
import info.archinnov.achilles.internal.validation.Validator;

public class ClusteringComponents extends AbstractComponentProperties {

    private final String reversedComponentName;

    public ClusteringComponents(List<Class<?>> componentClasses, List<String> componentNames,
            String reversedComponentName, List<Field> componentFields, List<Method> componentGetters,
            List<Method> componentSetters) {
        super(componentClasses, componentNames, componentFields, componentGetters, componentSetters);
        this.reversedComponentName = reversedComponentName;
    }

    public ClusteringComponents(List<Class<?>> componentClasses, List<String> componentNames,
            List<Field> componentFields, List<Method> componentGetters, List<Method> componentSetters) {
        this(componentClasses, componentNames, null, componentFields, componentGetters, componentSetters);
    }

    void validateClusteringComponents(String className, List<Object> clusteringComponents) {
        Validator.validateNotNull(clusteringComponents,
                "There should be at least one clustering key provided for querying on entity '%s'", className);

        int maxClusteringCount = componentClasses.size();

        Validator.validateTrue(clusteringComponents.size() <= maxClusteringCount,
                "There should be at most %s value(s) of clustering component(s) provided for querying on entity '%s'",
                maxClusteringCount, className);

        validateNoHoleAndReturnLastNonNullIndex(clusteringComponents);

        for (int i = 0; i < clusteringComponents.size(); i++) {
            Object clusteringKey = clusteringComponents.get(i);
            if (clusteringKey != null) {
                Class<?> clusteringType = clusteringKey.getClass();
                Class<?> expectedClusteringType = componentClasses.get(i);

                Validator.validateComparable(clusteringType,
                        "The type '%s' of clustering key '%s' for querying on entity '%s' should implement the Comparable<T> interface",
                        clusteringType.getCanonicalName(), clusteringKey, className);

                Validator.validateTrue(expectedClusteringType.equals(clusteringType),
                        "The type '%s' of clustering key '%s' for querying on entity '%s' is not valid. It should be '%s'",
                        clusteringType.getCanonicalName(), clusteringKey, className,
                        expectedClusteringType.getCanonicalName());
            }

        }
    }

    String getOrderingComponent() {
        return isClustered() ? componentNames.get(0) : null;
    }

    boolean isClustered() {
        return componentClasses.size() > 0;
    }

    public String getReversedComponent() {
        return reversedComponentName;
    }

    public boolean hasReversedComponent() {
        return StringUtils.isNotBlank(reversedComponentName);
    }

    private int validateNoHoleAndReturnLastNonNullIndex(List<Object> components) {
        boolean nullFlag = false;
        int lastNotNullIndex = 0;
        for (Object component : components) {
            if (component != null) {
                if (nullFlag) {
                    throw new AchillesException(
                            "There should not be any null value between two non-null components of an @EmbeddedId");
                }
                lastNotNullIndex++;
            } else {
                nullFlag = true;
            }
        }
        lastNotNullIndex--;

        return lastNotNullIndex;
    }
}