ValueStringFixed.java

/*
 * Copyright 2014-2015 the original author or authors
 *
 * Licensed under the Apache License, Version 2.0 (the “License”);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an “AS IS” BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wplatform.ddal.value;

import com.wplatform.ddal.engine.SysProperties;
import com.wplatform.ddal.util.StringUtils;

/**
 * Implementation of the CHAR data type.
 */
public class ValueStringFixed extends ValueString {

    private static final ValueStringFixed EMPTY = new ValueStringFixed("");

    protected ValueStringFixed(String value) {
        super(value);
    }

    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;
    }

    /**
     * Get or create a fixed length string value for the given string.
     * Spaces at the end of the string will be removed.
     *
     * @param s the string
     * @return the value
     */
    public static ValueStringFixed get(String s) {
        s = trimRight(s);
        if (s.length() == 0) {
            return EMPTY;
        }
        ValueStringFixed obj = new ValueStringFixed(StringUtils.cache(s));
        if (s.length() > SysProperties.OBJECT_CACHE_MAX_PER_ELEMENT_SIZE) {
            return obj;
        }
        return (ValueStringFixed) Value.cache(obj);
    }

    @Override
    public int getType() {
        return Value.STRING_FIXED;
    }

    @Override
    protected ValueString getNew(String s) {
        return ValueStringFixed.get(s);
    }

}