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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.odata2.core.ep.producer;
import java.io.IOException;
import java.io.Writer;
import java.util.List;
import org.apache.olingo.odata2.api.edm.Edm;
import org.apache.olingo.odata2.api.edm.EdmException;
import org.apache.olingo.odata2.api.ep.EntityProviderException;
import org.apache.olingo.odata2.core.ep.aggregator.EntityPropertyInfo;
import org.apache.olingo.odata2.core.ep.util.FormatJson;
import org.apache.olingo.odata2.core.ep.util.JsonStreamWriter;
/**
* Provider for writing a collection of simple-type or complex-type instances in JSON.
*
*/
public class JsonCollectionEntityProducer {
public void append(final Writer writer, final EntityPropertyInfo propertyInfo, final List<?> data)
throws EntityProviderException {
JsonStreamWriter jsonStreamWriter = new JsonStreamWriter(writer);
try {
jsonStreamWriter.beginObject()
.name(FormatJson.D)
.beginObject();
jsonStreamWriter.name(FormatJson.METADATA)
.beginObject()
.namedStringValueRaw(
FormatJson.TYPE,
"Collection(" + propertyInfo.getType().getNamespace() + Edm.DELIMITER + propertyInfo.getType().getName()
+ ")")
.endObject()
.separator();
jsonStreamWriter.name(FormatJson.RESULTS)
.beginArray();
boolean first = true;
for (final Object item : data) {
if (first) {
first = false;
} else {
jsonStreamWriter.separator();
}
JsonPropertyEntityProducer.appendPropertyValue(jsonStreamWriter, propertyInfo, item);
}
jsonStreamWriter.endArray();
jsonStreamWriter.endObject()
.endObject();
} catch (final IOException e) {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass()
.getSimpleName()), e);
} catch (final EdmException e) {
throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass()
.getSimpleName()), e);
}
}
}