org.apache.olingo.commons.core.data.AbstractJsonSerializer.java Source code

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Here is the source code for org.apache.olingo.commons.core.data.AbstractJsonSerializer.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.data;

import com.fasterxml.jackson.core.JsonGenerator;
import java.io.IOException;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.olingo.commons.api.data.CollectionValue;
import org.apache.olingo.commons.api.data.Property;
import org.apache.olingo.commons.api.data.Value;
import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeKind;
import org.apache.olingo.commons.core.edm.EdmTypeInfo;

abstract class AbstractJsonSerializer<T> extends ODataJacksonSerializer<T> {

    private static final EdmPrimitiveTypeKind[] NUMBER_TYPES = { EdmPrimitiveTypeKind.Byte,
            EdmPrimitiveTypeKind.SByte, EdmPrimitiveTypeKind.Single, EdmPrimitiveTypeKind.Double,
            EdmPrimitiveTypeKind.Int16, EdmPrimitiveTypeKind.Int32, EdmPrimitiveTypeKind.Int64 };

    private final JSONGeoValueSerializer geoSerializer = new JSONGeoValueSerializer();

    private void collection(final JsonGenerator jgen, final String itemType, final CollectionValue value)
            throws IOException {

        jgen.writeStartArray();
        for (Value item : value.get()) {
            value(jgen, itemType, item);
        }
        jgen.writeEndArray();
    }

    private void value(final JsonGenerator jgen, final String type, final Value value) throws IOException {
        final EdmTypeInfo typeInfo = type == null ? null
                : new EdmTypeInfo.Builder().setTypeExpression(type).build();

        if (value.isNull()) {
            jgen.writeNull();
        } else if (value.isSimple()) {
            final boolean isNumber = typeInfo == null ? NumberUtils.isNumber(value.asSimple().get())
                    : ArrayUtils.contains(NUMBER_TYPES, typeInfo.getPrimitiveTypeKind());
            final boolean isBoolean = typeInfo == null
                    ? (value.asSimple().get().equalsIgnoreCase(Boolean.TRUE.toString())
                            || value.asSimple().get().equalsIgnoreCase(Boolean.FALSE.toString()))
                    : typeInfo.getPrimitiveTypeKind() == EdmPrimitiveTypeKind.Boolean;

            if (isNumber) {
                jgen.writeNumber(value.asSimple().get());
            } else if (isBoolean) {
                jgen.writeBoolean(BooleanUtils.toBoolean(value.asSimple().get()));
            } else {
                jgen.writeString(value.asSimple().get());
            }
        } else if (value.isGeospatial()) {
            jgen.writeStartObject();
            geoSerializer.serialize(jgen, value.asGeospatial().get());
            jgen.writeEndObject();
        } else if (value.isCollection()) {
            collection(jgen, typeInfo == null ? null : typeInfo.getFullQualifiedName().toString(),
                    value.asCollection());
        } else if (value.isComplex()) {
            jgen.writeStartObject();
            for (Property property : value.asComplex().get()) {
                property(jgen, property, property.getName());
            }
            jgen.writeEndObject();
        }
    }

    protected void property(final JsonGenerator jgen, final Property property, final String name)
            throws IOException {
        jgen.writeFieldName(name);
        value(jgen, property.getType(), property.getValue());
    }
}