suneido.database.immudb.Indexes.java Source code

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Here is the source code for suneido.database.immudb.Indexes.java

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/* Copyright 2011 (c) Suneido Software Corp. All rights reserved.
 * Licensed under GPLv2.
 */

package suneido.database.immudb;

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

import suneido.util.Immutable;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

/**
 * A wrapper for a list of {@link Index}'s.
 * Used by {@link Table}.
 */
@Immutable
class Indexes implements Iterable<Index> {
    final ImmutableList<Index> indexes;

    Indexes(ImmutableList<Index> indexes) {
        this.indexes = indexes;
    }

    @Override
    public Iterator<Index> iterator() {
        return indexes.iterator();
    }

    boolean isEmpty() {
        return indexes.isEmpty();
    }

    Index first() {
        return indexes.get(0);
    }

    Index getIndex(int[] colNums) {
        for (Index index : indexes)
            if (Arrays.equals(colNums, index.colNums))
                return index;
        return null;
    }

    int size() {
        return indexes.size();
    }

    Index firstKey() {
        for (Index index : indexes)
            if (index.isKey())
                return index;
        return null;
    }

    List<List<String>> columns(Columns columns) {
        ImmutableList.Builder<List<String>> list = ImmutableList.builder();
        for (Index index : indexes)
            list.add(index.columns(columns));
        return list.build();
    }

    List<List<String>> keysColumns(Columns columns) {
        return columns(columns, true);
    }

    private List<List<String>> columns(Columns columns, boolean justKeys) {
        ImmutableList.Builder<List<String>> list = ImmutableList.builder();
        for (Index index : indexes)
            if (!justKeys || index.isKey())
                list.add(index.columns(columns));
        return list.build();
    }

    @Override
    public String toString() {
        return "Indexes " + Iterables.toString(this);
    }

}