SimpleRowValue.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.result;

import com.wplatform.ddal.engine.Constants;
import com.wplatform.ddal.value.Value;

/**
 * A simple row that contains data for only one column.
 */
public class SimpleRowValue implements SearchRow {

    private final int virtualColumnCount;
    private long key;
    private int version;
    private int index;
    private Value data;

    public SimpleRowValue(int columnCount) {
        this.virtualColumnCount = columnCount;
    }

    @Override
    public void setKeyAndVersion(SearchRow row) {
        key = row.getKey();
        version = row.getVersion();
    }

    @Override
    public int getVersion() {
        return version;
    }

    @Override
    public int getColumnCount() {
        return virtualColumnCount;
    }

    @Override
    public long getKey() {
        return key;
    }

    @Override
    public void setKey(long key) {
        this.key = key;
    }

    @Override
    public Value getValue(int idx) {
        return idx == index ? data : null;
    }

    @Override
    public void setValue(int idx, Value v) {
        index = idx;
        data = v;
    }

    @Override
    public String toString() {
        return "( /* " + key + " */ " + (data == null ?
                "null" : data.getTraceSQL()) + " )";
    }

    @Override
    public int getMemory() {
        return Constants.MEMORY_OBJECT + (data == null ? 0 : data.getMemory());
    }

}