valuebytesbase.java

非常棒的java数据库

/*
 * Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
 * (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.value;

import java.sql.PreparedStatement;
import java.sql.SQLException;

import org.h2.util.ByteUtils;
import org.h2.util.MathUtils;

/**
 * This is the base class for ValueBytes and ValueJavaObject.
 */
abstract class ValueBytesBase extends Value {

    private final byte[] value;
    private int hash;

    protected ValueBytesBase(byte[] v) {
        this.value = v;
    }

    public String getSQL() {
        return "X'" + getString() + "'";
    }

    public byte[] getBytesNoCopy() {
        return value;
    }

    public byte[] getBytes() {
        return ByteUtils.cloneByteArray(value);
    }

    protected int compareSecure(Value v, CompareMode mode) {
        byte[] v2 = ((ValueBytesBase) v).value;
        return ByteUtils.compareNotNull(value, v2);
    }

    public String getString() {
        return ByteUtils.convertBytesToString(value);
    }

    public long getPrecision() {
        return value.length;
    }

    public int hashCode() {
        if (hash == 0) {
            hash = ByteUtils.getByteArrayHash(value);
        }
        return hash;
    }

    public Object getObject() {
        return getBytes();
    }

    public void set(PreparedStatement prep, int parameterIndex) throws SQLException {
        prep.setBytes(parameterIndex, value);
    }

    public int getDisplaySize() {
        return MathUtils.convertLongToInt(value.length * 2L);
    }

    public int getMemory() {
        return value.length + 4;
    }

    public boolean equals(Object other) {
        return other instanceof ValueBytesBase && ByteUtils.compareNotNull(value, ((ValueBytesBase) other).value) == 0;
    }

}