?? valuestringfixed.java
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/*
* 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.SQLException;
import org.h2.constant.SysProperties;
import org.h2.util.MathUtils;
import org.h2.util.StringCache;
/**
* Implementation of the CHAR data type.
*/
public class ValueStringFixed extends ValueStringBase {
private static final ValueStringFixed EMPTY = new ValueStringFixed("");
protected ValueStringFixed(String value) {
super(value);
}
protected int compareSecure(Value o, CompareMode mode) throws SQLException {
// compatibility: the other object could be ValueString
ValueStringBase v = (ValueStringBase) o;
return mode.compareString(value, v.value, false);
}
private static String trimRight(String s) {
int endIndex = s.length() - 1;
int i = endIndex;
while (i >= 0 && s.charAt(i) == ' ') {
i--;
}
s = i == endIndex ? s : s.substring(0, i + 1);
return s;
}
public boolean equals(Object other) {
return other instanceof ValueStringBase && value.equals(((ValueStringBase) other).value);
}
public int hashCode() {
// TODO hash performance: could build a quicker hash
// by hashing the size and a few characters
return value.hashCode();
}
public int getType() {
return Value.STRING_FIXED;
}
public static ValueStringFixed get(String s) {
if (s.length() == 0) {
return EMPTY;
}
s = trimRight(s);
ValueStringFixed obj = new ValueStringFixed(StringCache.get(s));
if (s.length() > SysProperties.OBJECT_CACHE_MAX_PER_ELEMENT_SIZE) {
return obj;
}
return (ValueStringFixed) Value.cache(obj);
}
public Value convertPrecision(long precision) {
if (precision == 0 || value.length() <= precision) {
return this;
}
int p = MathUtils.convertLongToInt(precision);
return ValueStringFixed.get(value.substring(0, p));
}
}
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