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Permazen analog to UNIX fsck(8) command for checking the consistency of, and repairing any corruption in, a Permazen key/value database

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/*
 * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
 */

package io.permazen.jsck;

import io.permazen.core.FieldType;
import io.permazen.core.ObjId;
import io.permazen.schema.MapSchemaField;
import io.permazen.util.ByteReader;
import io.permazen.util.ByteWriter;

import java.util.Arrays;

class MapValueIndex extends ComplexFieldIndex {

    protected final FieldType keyType;

    MapValueIndex(JsckInfo info, int schemaVersion, MapSchemaField field) {
        super(info, schemaVersion, field, field.getValueField(), "map", "value");
        this.keyType = this.info.findFieldType(schemaVersion, field.getKeyField()).genericizeForIndex();
    }

    @Override
    public boolean isCompatible(Storage that) {
        if (!super.isCompatible(that))
            return false;
        if (!this.keyType.equals(((MapValueIndex)that).keyType))
            return false;
        return true;
    }

    @Override
    protected void validateIndexEntrySuffix(JsckInfo info, ByteReader reader, byte[] indexValue, ObjId id) {

        // Decode map key
        final byte[] indexKeyValue = this.validateEncodedBytes(reader, this.keyType);
        this.validateEOF(reader);

        // Validate value exists in map under specified key
        if (info.getConfig().isRepair()) {
            final ByteWriter writer = this.buildFieldKey(id, this.parentStorageId);
            writer.write(indexKeyValue);
            final byte[] key = writer.getBytes();
            final byte[] actualValue = info.getKVStore().get(key);
            if (actualValue == null) {
                throw new IllegalArgumentException("object " + id + " map field #" + this.parentStorageId + " with key "
                  + this.keyType + " does not contain key " + Jsck.ds(indexKeyValue));
            } else if (!Arrays.equals(actualValue, indexValue)) {
                throw new IllegalArgumentException("object " + id + " map field #" + this.parentStorageId + " with key "
                  + this.keyType + "  contains value " + Jsck.ds(actualValue) + " != " + Jsck.ds(indexValue) + " under key "
                  + Jsck.ds(indexKeyValue));
            }
        }
    }
}