org.apache.olingo.commons.core.serialization.JsonEntitySetSerializer.java Source code

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Here is the source code for org.apache.olingo.commons.core.serialization.JsonEntitySetSerializer.java

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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.olingo.commons.core.serialization;

import com.fasterxml.jackson.core.JsonGenerator;
import org.apache.commons.lang3.StringUtils;
import org.apache.olingo.commons.api.Constants;
import org.apache.olingo.commons.api.data.Annotation;
import org.apache.olingo.commons.api.data.Entity;
import org.apache.olingo.commons.api.data.EntitySet;
import org.apache.olingo.commons.api.data.ResWrap;
import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeException;
import org.apache.olingo.commons.api.edm.constants.ODataServiceVersion;

import java.io.IOException;
import java.net.URI;

public class JsonEntitySetSerializer extends JsonSerializer {

    public JsonEntitySetSerializer(final ODataServiceVersion version, final boolean serverMode) {
        super(version, serverMode);
    }

    protected void doSerialize(final EntitySet entitySet, final JsonGenerator jgen)
            throws IOException, EdmPrimitiveTypeException {
        doContainerSerialize(new ResWrap<EntitySet>((URI) null, null, entitySet), jgen);
    }

    protected void doContainerSerialize(final ResWrap<EntitySet> container, final JsonGenerator jgen)
            throws IOException, EdmPrimitiveTypeException {

        final EntitySet entitySet = container.getPayload();

        jgen.writeStartObject();

        if (serverMode) {
            if (container.getContextURL() != null) {
                jgen.writeStringField(version.compareTo(ODataServiceVersion.V40) >= 0 ? Constants.JSON_CONTEXT
                        : Constants.JSON_METADATA, container.getContextURL().toASCIIString());
            }

            if (version.compareTo(ODataServiceVersion.V40) >= 0
                    && StringUtils.isNotBlank(container.getMetadataETag())) {
                jgen.writeStringField(Constants.JSON_METADATA_ETAG, container.getMetadataETag());
            }
        }

        if (entitySet.getId() != null) {
            jgen.writeStringField(version.getJsonName(ODataServiceVersion.JsonKey.ID),
                    entitySet.getId().toASCIIString());
        }
        jgen.writeNumberField(version.getJsonName(ODataServiceVersion.JsonKey.COUNT),
                entitySet.getCount() == null ? entitySet.getEntities().size() : entitySet.getCount());
        if (serverMode) {
            if (entitySet.getNext() != null) {
                jgen.writeStringField(version.getJsonName(ODataServiceVersion.JsonKey.NEXT_LINK),
                        entitySet.getNext().toASCIIString());
            }
            if (entitySet.getDeltaLink() != null) {
                jgen.writeStringField(version.getJsonName(ODataServiceVersion.JsonKey.DELTA_LINK),
                        entitySet.getDeltaLink().toASCIIString());
            }
        }

        for (Annotation annotation : entitySet.getAnnotations()) {
            valuable(jgen, annotation, "@" + annotation.getTerm());
        }

        jgen.writeArrayFieldStart(Constants.VALUE);
        final JsonEntitySerializer entitySerializer = new JsonEntitySerializer(version, serverMode);
        for (Entity entity : entitySet.getEntities()) {
            entitySerializer.doSerialize(entity, jgen);
        }
        jgen.writeEndArray();

        jgen.writeEndObject();
    }
}