BooleanCodec.java

/*
 * Copyright 2017-2019 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
 *
 *      https://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.r2dbc.postgresql.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.r2dbc.postgresql.client.Parameter;
import io.r2dbc.postgresql.message.Format;
import io.r2dbc.postgresql.type.PostgresqlObjectId;
import io.r2dbc.postgresql.util.Assert;
import io.r2dbc.postgresql.util.ByteBufUtils;
import reactor.util.annotation.Nullable;

import static io.r2dbc.postgresql.message.Format.FORMAT_TEXT;
import static io.r2dbc.postgresql.type.PostgresqlObjectId.BOOL;

final class BooleanCodec extends AbstractCodec<Boolean> {

    private final ByteBufAllocator byteBufAllocator;

    BooleanCodec(ByteBufAllocator byteBufAllocator) {
        super(Boolean.class);
        this.byteBufAllocator = Assert.requireNonNull(byteBufAllocator, "byteBufAllocator must not be null");
    }

    @Override
    public Parameter encodeNull() {
        return createNull(FORMAT_TEXT, BOOL);
    }

    @Override
    boolean doCanDecode(Format format, PostgresqlObjectId type) {
        Assert.requireNonNull(format, "format must not be null");
        Assert.requireNonNull(type, "type must not be null");

        return FORMAT_TEXT == format && BOOL == type;
    }

    @Override
    Boolean doDecode(ByteBuf byteBuf, @Nullable Format format, @Nullable Class<? extends Boolean> type) {
        Assert.requireNonNull(byteBuf, "byteBuf must not be null");

        String decoded = ByteBufUtils.decode(byteBuf);
        return "1".equals(decoded)
            || "true".equalsIgnoreCase(decoded)
            || "t".equalsIgnoreCase(decoded)
            || "yes".equalsIgnoreCase(decoded)
            || "y".equalsIgnoreCase(decoded)
            || "on".equalsIgnoreCase(decoded);
    }

    @Override
    Parameter doEncode(Boolean value) {
        Assert.requireNonNull(value, "value must not be null");

        ByteBuf encoded = ByteBufUtils.encode(this.byteBufAllocator, value ? "TRUE" : "FALSE");
        return create(FORMAT_TEXT, BOOL, encoded);
    }

}