/**

* Copyright (C) 2004-2016, GoodData(R) Corporation. All rights reserved.

* This source code is licensed under the BSD-style license found in the

* LICENSE.txt file in the root directory of this source tree.

*/

package com.gooddata.md;

import static com.gooddata.util.Validate.notEmpty;

import static com.gooddata.util.Validate.notNull;

import com.fasterxml.jackson.core.JsonGenerator;

import com.fasterxml.jackson.core.JsonParser;

import com.fasterxml.jackson.databind.DeserializationContext;

import com.fasterxml.jackson.databind.JsonDeserializer;

import com.fasterxml.jackson.databind.JsonNode;

import com.fasterxml.jackson.databind.JsonSerializer;

import com.fasterxml.jackson.databind.SerializerProvider;

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import com.gooddata.util.GoodDataToStringBuilder;

import java.io.IOException;

/**

* Internal representation of attribute sort field. Which can be either plain text value or structure pointing to display form.

*/

@JsonDeserialize(using = AttributeSort.Deserializer.class)

@JsonSerialize(using = AttributeSort.Serializer.class)

class AttributeSort {

static final String PK = "pk";

static final String BY_USED_DF = "byUsedDF";

private final String value;

private final boolean linkType;

AttributeSort(String value) {

this(value, false);

}

AttributeSort(String value, boolean linkType) {

this.value = notEmpty(value, "value");

this.linkType = linkType;

}

String getValue() {

return value;

}

boolean isLinkType() {

return linkType;

}

@Override

public String toString() {

return GoodDataToStringBuilder.defaultToString(this);

}

static class Deserializer extends JsonDeserializer<AttributeSort> {

@Override

public AttributeSort deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {

final JsonNode root = p.readValueAsTree();

notNull(root, "jsonNode");

if (root.isTextual()) {

return new AttributeSort(root.textValue());

} else if (root.isObject()) {

return new AttributeSort(root.findValue("uri").textValue(), true);

} else {

throw ctxt.mappingException("Only textual or object node expected but %s node found",

root.getNodeType().name());

}

}

}

static class Serializer extends JsonSerializer<AttributeSort> {

@Override

public void serialize(AttributeSort value, JsonGenerator gen, SerializerProvider serializers) throws IOException {

if (value.linkType) {

gen.writeStartObject();

gen.writeFieldName("df");

gen.writeStartObject();

gen.writeStringField("uri", value.getValue());

gen.writeEndObject();

gen.writeEndObject();

} else {

gen.writeString(value.getValue());

}

}

}

}