com.stratio.cassandra.index.query.Sorting.java Source code

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Here is the source code for com.stratio.cassandra.index.query.Sorting.java

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/*
 * Copyright 2014, Stratio.
 *
 * 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.stratio.cassandra.index.query;

import com.stratio.cassandra.index.schema.Schema;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;

import java.util.Iterator;
import java.util.List;

/**
 * A sorting of fields for a search.
 *
 * @author Andres de la Pena <adelapena@stratio.com>
 */
public class Sorting implements Iterable<SortingField> {

    /**
     * How to sortFields each field
     */
    private final List<SortingField> sortingFields;

    @JsonCreator
    public Sorting(@JsonProperty("fields") List<SortingField> sortingFields) {
        this.sortingFields = sortingFields;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Iterator<SortingField> iterator() {
        return sortingFields.iterator();
    }

    /**
     * Returns the {@link SortingField}s to be used.
     *
     * @return The {@link SortingField}s to be used.
     */
    public List<SortingField> getSortingFields() {
        return sortingFields;
    }

    /**
     * Returns the Lucene's {@link Sort} representing this {@link Sorting}.
     *
     * @param schema The {@link Schema} to be used.
     * @return the Lucene's {@link Sort} representing this {@link Sorting}.
     */
    public Sort sort(Schema schema) {
        SortField[] sortFields = new SortField[sortingFields.size()];
        for (int i = 0; i < sortingFields.size(); i++) {
            sortFields[i] = sortingFields.get(i).sortField(schema);
        }
        return new Sort(sortFields);
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).append("sortingFields", sortingFields).toString();
    }
}