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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.hitfield;
import com.yahoo.text.XML;
import com.yahoo.data.access.Inspector;
import com.yahoo.data.access.Type;
import java.util.Map;
/**
* Utility class for converting accessible data into the historical "prelude" xml format.
*/
public class XmlRenderer {
public static StringBuilder render(StringBuilder target, Inspector value) {
new InspectorRenderer(target).renderInspector(value, 2);
return target;
}
private static class InspectorRenderer {
private final StringBuilder renderTarget;
InspectorRenderer(StringBuilder target) {
this.renderTarget = target;
}
void renderInspector(Inspector value, int nestingLevel) {
if (value.type() == Type.ARRAY) {
renderMapOrArray(value, nestingLevel);
} else if (value.type() == Type.OBJECT) {
renderStruct(value, nestingLevel);
} else if (value.type() == Type.STRING) {
renderTarget.append(XML.xmlEscape(value.asString(), false));
} else if (value.type() == Type.LONG) {
long l = value.asLong();
renderTarget.append(String.valueOf(l));
} else if (value.type() == Type.DOUBLE) {
double d = value.asDouble();
renderTarget.append(String.valueOf(d));
} else if (value.type() == Type.BOOL) {
boolean b = value.asBool();
renderTarget.append(b ? "true" : "false");
} else if (value.type() == Type.DATA) {
byte[] data = value.asData();
renderTarget.append("<data length=\"").append(data.length);
renderTarget.append("\" encoding=\"hex\">");
for (int i = 0; i < data.length; i++) {
for (int sh = 4; sh >= 0; sh -= 4) {
int val = (data[i] >> sh) & 0xF;
char hexdigit = (val < 10) ? ((char)('0' + val)) : ((char)('A' + val - 10));
renderTarget.append(hexdigit);
}
}
renderTarget.append("</data>");
}
}
private void renderMapItem(Inspector object, int nestingLevel) {
renderTarget.append('\n');
indent(nestingLevel);
renderTarget.append("<item><key>");
renderInspector(object.field("key"), nestingLevel);
renderTarget.append("</key><value>");
renderInspector(object.field("value"), nestingLevel);
renderTarget.append("</value></item>");
}
private void renderStructure(Inspector structure, int nestingLevel) {
for (Map.Entry<String,Inspector> entry : structure.fields()) {
String key = entry.getKey();
Inspector value = entry.getValue();
renderTarget.append('\n');
indent(nestingLevel);
renderTarget.append("<struct-field name=\"").append(key).append("\">");
renderInspector(value, nestingLevel);
renderTarget.append("</struct-field>");
}
renderTarget.append('\n');
}
private void renderStruct(Inspector object, int nestingLevel) {
renderStructure(object, nestingLevel + 1);
indent(nestingLevel);
}
private void indent(int nestingLevel) {
for (int i = 0; i < nestingLevel; ++i) {
renderTarget.append(" ");
}
}
private void renderMap(Inspector sequence, int nestingLevel) {
int limit = sequence.entryCount();
if (limit == 0) return;
for (int i = 0; i < limit; ++i)
renderMapItem(sequence.entry(i), nestingLevel);
renderTarget.append("\n");
}
/** Returns true if the given array represents a map - a list of pairs called "key" and "value" */
private boolean isMap(Inspector array) {
Inspector firstObject = array.entry(0);
if (firstObject.type() != Type.OBJECT) return false;
if (firstObject.fieldCount() != 2) return false;
if (! firstObject.field("key").valid()) return false;
if (! firstObject.field("value").valid()) return false;
return true;
}
/**
* Returns true if the given array represents a weighted set,
* as a list of pairs called "item" and "weight"
**/
private boolean isWeightedSetObjects(Inspector array) {
Inspector firstObject = array.entry(0);
if (firstObject.type() != Type.OBJECT) return false;
if (firstObject.fieldCount() != 2) return false;
if (! firstObject.field("item").valid()) return false;
if (! firstObject.field("weight").valid()) return false;
return true;
}
/**
* Returns true if the given array represents a weighted set,
* as a list of tuples
**/
private boolean isWeightedSetArrays(Inspector array) {
Inspector firstObject = array.entry(0);
if (firstObject.type() != Type.ARRAY) return false;
if (firstObject.entryCount() != 2) return false;
return true;
}
private void renderMapOrArray(Inspector sequence, int nestingLevel)
{
if (sequence.entryCount() == 0) return;
if (isMap(sequence)) {
renderMap(sequence, nestingLevel + 1);
} else if (isWeightedSetArrays(sequence)) {
renderWeightedSet(sequence, nestingLevel + 1, true);
} else if (isWeightedSetObjects(sequence)) {
renderWeightedSet(sequence, nestingLevel + 1, false);
} else {
renderArray(sequence, nestingLevel + 1);
}
indent(nestingLevel);
}
private void renderWeightedSet(Inspector seq, int nestingLevel, boolean nestedarray) {
int limit = seq.entryCount();
renderTarget.append('\n');
for (int i = 0; i < limit; ++i) {
Inspector value = nestedarray ? seq.entry(i).entry(0) : seq.entry(i).field("item");
Inspector weight = nestedarray ? seq.entry(i).entry(1) : seq.entry(i).field("weight");
long lw = 0;
double dw = 0;
if (weight.type() == Type.LONG) {
lw = weight.asLong();
dw = (double)lw;
}
if (weight.type() == Type.DOUBLE) {
dw = weight.asDouble();
lw = (long)dw;
}
indent(nestingLevel);
renderTarget.append("<item weight=\"");
if (dw == (double)lw || weight.type() == Type.LONG) {
renderTarget.append(lw);
} else {
renderTarget.append(dw);
}
renderTarget.append("\">");
renderInspector(value, nestingLevel);
renderTarget.append("</item>\n");
}
}
private void renderArray(Inspector seq, int nestingLevel) {
int limit = seq.entryCount();
if (limit == 0) return;
renderTarget.append('\n');
for (int i = 0; i < limit; ++i) {
Inspector value = seq.entry(i);
indent(nestingLevel);
renderTarget.append("<item>");
renderInspector(value, nestingLevel);
renderTarget.append("</item>\n");
}
}
}
}
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