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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.query.textualrepresentation;
import com.yahoo.prelude.query.Item;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.regex.Pattern;
/**
* Creates a detailed representation of a query tree.
*
* @author Tony Vaagenes
*/
public class TextualQueryRepresentation {
private final Map<Item, Integer> itemReferences = new IdentityHashMap<>();
private int nextItemReference = 0;
final private ItemDiscloser rootDiscloser;
@SuppressWarnings("rawtypes")
private String valueString(Object value) {
if (value == null)
return null;
else if (value instanceof String)
return '"' + quote((String)value) + '"';
else if (value instanceof Number || value instanceof Boolean || value instanceof Enum)
return value.toString();
else if (value instanceof Item)
return itemReference((Item)value);
else if (value.getClass().isArray())
return listString(arrayToList(value).iterator());
else if ( value instanceof List )
return listString(((List)value).iterator());
else if ( value instanceof Set )
return listString( ((Set)value).iterator());
else if ( value instanceof Map )
return mapString((Map)value);
else
return '"' + quote(value.toString()) + '"';
}
//handles both primitive and object arrays.
@SuppressWarnings({ "rawtypes", "unchecked" })
private List arrayToList(Object array) {
int length = Array.getLength(array);
List list = new ArrayList();
for (int i = 0; i<length; ++i)
list.add(Array.get(array, i));
return list;
}
private String mapString(Map<?, ?> map) {
StringBuilder result = new StringBuilder();
final String mapBegin = "map(";
result.append(mapBegin);
boolean firstTime = true;
for (Map.Entry<?,?> entry: map.entrySet()) {
if (!firstTime)
result.append(' ');
firstTime = false;
result.append(valueString(entry.getKey())).append("=>").append(valueString(entry.getValue()));
}
result.append(')');
return result.toString();
}
private String listString(Iterator<?> iterator) {
StringBuilder result = new StringBuilder();
result.append('(');
boolean firstTime = true;
while (iterator.hasNext()) {
if (!firstTime)
result.append(' ');
firstTime = false;
result.append(valueString(iterator.next()));
}
result.append(')');
return result.toString();
}
private String itemReference(Item item) {
Integer reference = itemReferences.get(item);
return reference != null ? reference.toString() : "Unknown item: '" + System.identityHashCode(item) + "'";
}
private static String quote(String s) {
return s.replaceAll("\"", "\\\\\"" );
}
private ItemDiscloser expose(Item item) {
ItemDiscloser itemDiscloser = new ItemDiscloser(item);
item.disclose(itemDiscloser);
return itemDiscloser;
}
public TextualQueryRepresentation(Item root) {
rootDiscloser = expose(root);
}
@Override
public String toString() {
return rootDiscloser.toString();
}
/** Creates the textual representation for a single Item. */
private class ItemDiscloser implements Discloser {
private final Item item;
final Map<String, Object> properties = new TreeMap<>();
final String name;
Object value;
final List<ItemDiscloser> children = new ArrayList<>();
ItemDiscloser(Item item) {
this.item = item;
name = item.getName();
}
public void addProperty(String key, Object value) {
assert(key.indexOf(' ') == -1);
properties.put(key, value);
if (value instanceof Item)
setItemReference((Item)value);
}
public void setValue(Object value) {
assert(children.isEmpty());
this.value = value;
}
public void addChild(Item child) {
assert(value == null);
children.add(expose(child));
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append(name);
if ( ! properties.isEmpty() || itemReferences.get(item) != null) {
builder.append('[');
addPropertiesString(builder);
builder.append(']');
}
if (value != null || !children.isEmpty()) {
builder.append("{\n");
addBody(builder);
builder.append("}\n");
}
return builder.toString();
}
private void addBody(StringBuilder builder) {
if (value != null) {
addIndented(builder, valueString(value));
} else {
for (ItemDiscloser child : children) {
addIndented(builder, child.toString());
}
}
}
//for each line: add "<indentation><line><newline>"
private void addIndented(StringBuilder builder, String toAdd) {
String indent = " ";
for (String line : toAdd.split(Pattern.quote("\n")))
builder.append(indent).append(line).append('\n');
}
private void addPropertiesString(StringBuilder s) {
boolean firstTime = true;
Integer itemReference = itemReferences.get(item);
if (itemReference != null) {
addPropertyString(s, "%id", itemReference);
firstTime = false;
}
for (Map.Entry<String,Object> entry : properties.entrySet()) {
if (!firstTime) {
s.append(' ');
}
addPropertyString(s, entry.getKey(), entry.getValue());
firstTime = false;
}
}
private void addPropertyString(StringBuilder s, String key, Object value) {
s.append(key).append('=').append(valueString(value));
}
private void setItemReference(Item item) {
if (itemReferences.get(item) == null)
itemReferences.put(item, nextItemReference++);
}
}
}
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