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Apache CXF Runtime JAX-RS Frontend
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.jaxrs.provider;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;

import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.helpers.IOUtils;
import org.apache.cxf.jaxrs.model.ParameterType;
import org.apache.cxf.jaxrs.utils.HttpUtils;
import org.apache.cxf.jaxrs.utils.InjectionUtils;

@Consumes("text/plain")
@Produces("text/plain")
public class PrimitiveTextProvider extends AbstractConfigurableProvider
    implements MessageBodyReader, MessageBodyWriter {

    private static boolean isSupported(Class type, MediaType mt) {
        boolean isPrimitive = InjectionUtils.isPrimitiveOnly(type);
        return isPrimitive && mt.isCompatible(MediaType.TEXT_PLAIN_TYPE);
    }

    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mt) {
        return isSupported(type, mt);
    }

    public T readFrom(Class type, Type genType, Annotation[] anns, MediaType mt,
                      MultivaluedMap headers, InputStream is) throws IOException {
        String string = IOUtils.toString(is, HttpUtils.getEncoding(mt, StandardCharsets.UTF_8.name()));
        if (StringUtils.isEmpty(string)) {
            reportEmptyContentLength();
        }
        if (type == Character.class) {
            char character = string.charAt(0);
            return type.cast(Character.valueOf(character));
        }
        return InjectionUtils.handleParameter(
                    string,
                    false,
                    type,
                    genType,
                    anns,
                    ParameterType.REQUEST_BODY, null);

    }

    public long getSize(T t, Class type, Type genericType, Annotation[] annotations, MediaType mt) {
        return -1;
    }

    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mt) {
        return isSupported(type, mt);
    }

    public void writeTo(T obj, Class type, Type genType, Annotation[] anns,
                        MediaType mt, MultivaluedMap headers,
                        OutputStream os) throws IOException {
        String encoding = HttpUtils.getSetEncoding(mt, headers, StandardCharsets.UTF_8.name());
        byte[] bytes = obj.toString().getBytes(encoding);
        os.write(bytes);

    }

}