com.eventsourcing.index.AbstractIndexEngine.java Source code

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Here is the source code for com.eventsourcing.index.AbstractIndexEngine.java

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/**
 * Copyright (c) 2016, All Contributors (see CONTRIBUTORS file)
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package com.eventsourcing.index;

import com.eventsourcing.Entity;
import com.google.common.util.concurrent.AbstractService;
import com.googlecode.cqengine.index.Index;

import java.util.Arrays;
import java.util.List;

public abstract class AbstractIndexEngine extends AbstractService implements IndexEngine {

    protected abstract List<IndexCapabilities> getIndexMatrix();

    @Override
    @SuppressWarnings("unchecked")
    public <O extends Entity, A> Index<O> getIndexOnAttribute(Attribute<O, A> attribute, IndexFeature... features)
            throws IndexNotSupported {
        for (IndexCapabilities capabilities : getIndexMatrix()) {
            if (Arrays.asList(capabilities.getFeatures()).containsAll(Arrays.asList(features))) {
                return ((IndexCapabilities<Attribute>) capabilities).getIndex().apply(attribute);
            }
        }
        throw new IndexNotSupported(new Attribute[] { attribute }, features, this);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <O extends Entity, A> Index<O> getIndexOnAttributes(Attribute<O, A>[] attributes,
            IndexFeature... features) throws IndexNotSupported {
        for (IndexCapabilities capabilities : getIndexMatrix()) {
            if (Arrays.asList(capabilities.getFeatures()).containsAll(Arrays.asList(features))) {
                return ((IndexCapabilities<Attribute[]>) capabilities).getIndex().apply(attributes);
            }
        }
        throw new IndexNotSupported(attributes, features, this);
    }
}