io.reactiverse.pgclient.impl.RowResultDecoder.java Source code

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Here is the source code for io.reactiverse.pgclient.impl.RowResultDecoder.java

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/*
 * Copyright (C) 2017 Julien Viet
 *
 * 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 io.reactiverse.pgclient.impl;

import io.reactiverse.pgclient.Row;
import io.reactiverse.pgclient.impl.codec.ColumnDesc;
import io.reactiverse.pgclient.impl.codec.DataFormat;
import io.reactiverse.pgclient.impl.codec.DataTypeCodec;
import io.reactiverse.pgclient.impl.codec.decoder.RowDecoder;
import io.reactiverse.pgclient.impl.codec.decoder.RowDescription;
import io.netty.buffer.ByteBuf;

import java.util.function.BiConsumer;
import java.util.stream.Collector;

public class RowResultDecoder<C, R> implements RowDecoder {

    private final Collector<Row, C, R> collector;
    private final boolean singleton;
    private final BiConsumer<C, Row> accumulator;

    private RowDescription desc;
    private int size;
    private C container;
    private Row row;

    RowResultDecoder(Collector<Row, C, R> collector, boolean singleton, RowDescription desc) {
        this.collector = collector;
        this.singleton = singleton;
        this.accumulator = collector.accumulator();
        this.desc = desc;
    }

    public RowDescription description() {
        return desc;
    }

    public int size() {
        return size;
    }

    @Override
    public void decodeRow(int len, ByteBuf in) {
        if (container == null) {
            container = collector.supplier().get();
        }
        if (singleton) {
            if (row == null) {
                row = new RowImpl(desc);
            } else {
                row.clear();
            }
        } else {
            row = new RowImpl(desc);
        }
        Row row = new RowImpl(desc);
        for (int c = 0; c < len; ++c) {
            int length = in.readInt();
            Object decoded = null;
            if (length != -1) {
                ColumnDesc columnDesc = desc.columns()[c];
                if (columnDesc.getDataFormat() == DataFormat.BINARY) {
                    decoded = DataTypeCodec.decodeBinary(columnDesc.getDataType(), in.readerIndex(), length, in);
                } else {
                    decoded = DataTypeCodec.decodeText(columnDesc.getDataType(), in.readerIndex(), length, in);
                }
                in.skipBytes(length);
            }
            row.addValue(decoded);
        }
        accumulator.accept(container, row);
        size++;
    }

    R complete() {
        if (container == null) {
            container = collector.supplier().get();
        }
        return collector.finisher().apply(container);
    }

    void reset() {
        container = null;
        size = 0;
    }
}