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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.values.storable;

import java.util.Arrays;

import org.neo4j.hashing.HashFunction;
import org.neo4j.values.AnyValue;
import org.neo4j.values.ValueMapper;

import static java.lang.String.format;
import static org.neo4j.memory.HeapEstimator.shallowSizeOfInstance;
import static org.neo4j.memory.HeapEstimator.sizeOf;

public final class CharArray extends TextArray
{
    private static final long SHALLOW_SIZE = shallowSizeOfInstance( CharArray.class );

    private final char[] value;

    CharArray( char[] value )
    {
        assert value != null;
        this.value = value;
    }

    @Override
    public boolean equals( Value other )
    {
        return other.equals( value );
    }

    @Override
    public boolean equals( char[] x )
    {
        return Arrays.equals( value, x );
    }

    @Override
    public boolean equals( String[] x )
    {
        return PrimitiveArrayValues.equals( value, x );
    }

    @Override
    protected int computeHashToMemoize()
    {
        return NumberValues.hash( value );
    }

    @Override
    public long updateHash( HashFunction hashFunction, long hash )
    {
        hash = hashFunction.update( hash, value.length );
        for ( char c : value )
        {
            hash = CharValue.updateHash( hashFunction, hash, c );
        }
        return hash;
    }

    @Override
    public int length()
    {
        return value.length;
    }

    @Override
    public String stringValue( int offset )
    {
        return Character.toString( value[offset] );
    }

    @Override
    public  void writeTo( ValueWriter writer ) throws E
    {
        PrimitiveArrayWriting.writeTo( writer, value );
    }

    @Override
    public char[] asObjectCopy()
    {
        return Arrays.copyOf( value, value.length );
    }

    @Override
    @Deprecated
    public char[] asObject()
    {
        return value;
    }

    @Override
    public String prettyPrint()
    {
        return Arrays.toString( value );
    }

    @Override
    public AnyValue value( int position )
    {
        return Values.charValue( value[position] );
    }

    @Override
    public  T map( ValueMapper mapper )
    {
        return mapper.mapCharArray( this );
    }

    @Override
    public String toString()
    {
        return format( "%s%s", getTypeName(), Arrays.toString( value ) );
    }

    @Override
    public String getTypeName()
    {
        return "CharArray";
    }

    @Override
    public long estimatedHeapUsage()
    {
        return SHALLOW_SIZE + sizeOf( value );
    }

    @Override
    public boolean hasCompatibleType( AnyValue value )
    {
        return value instanceof CharValue;
    }

    @Override
    public ArrayValue copyWithAppended( AnyValue added )
    {
        assert hasCompatibleType( added ) : "Incompatible types";
        char[] newArray = Arrays.copyOf( value, value.length + 1 );
        newArray[value.length] = ((CharValue) added).value();
        return new CharArray( newArray );
    }

    @Override
    public ArrayValue copyWithPrepended( AnyValue prepended )
    {
        assert hasCompatibleType( prepended ) : "Incompatible types";
        char[] newArray = new char[value.length + 1];
        System.arraycopy( value, 0, newArray, 1, value.length );
        newArray[0] = ((CharValue) prepended).value();
        return new CharArray( newArray );
    }
}