com.budjb.rabbitmq.converter.IntegerMessageConverter Maven / Gradle / Ivy

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A Spring Boot library that allows applications to publish to multiple connections.

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/*
 * Copyright 2019 Bud Byrd
 *
 * 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.budjb.rabbitmq.converter;

import org.springframework.util.ClassUtils;
import org.springframework.util.MimeType;

import java.nio.charset.Charset;
import java.util.HashMap;

/**
 * A converter that supports the conversion of an integer via its string representation.
 */
public class IntegerMessageConverter implements ByteToObjectConverter, ObjectToByteConverter {
    /**
     * Mime type.
     */
    private static final MimeType mimeType = MimeType.valueOf("text/plain");

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean supports(Class type) {
        return ClassUtils.isAssignable(int.class, type);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean supports(MimeType mimeType) {
        return mimeType.isCompatibleWith(mimeType);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ByteToObjectResult convert(ByteToObjectInput input) {
        try {
            if (input.getCharset() != null) {
                return new ByteToObjectResult(Integer.parseInt(new String(input.getBytes(), input.getCharset())));
            }
            else {
                return new ByteToObjectResult(Integer.parseInt(new String(input.getBytes(), Charset.defaultCharset())));
            }
        }
        catch (NumberFormatException ignored) {
            return null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ObjectToByteResult convert(ObjectToByteInput input) {
        return new ObjectToByteResult(
            input.getObject().toString().getBytes(input.getCharset()),
            new MimeType(mimeType, new HashMap() {{
                put("charset", input.getCharset().name());
            }})
        );
    }
}