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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.ConfigurationRuntimeException;
/**
* Class for holding the key when doing cache look-ups and other management of config instances.
*
* @author hmusum
*/
public class ConfigKey<CONFIGCLASS extends ConfigInstance> implements Comparable<ConfigKey<?>> {
private final String name;
private final String configId;
private final String namespace;
// The two fields below are only set when ConfigKey is constructed from a config class. Can be null
private final Class<CONFIGCLASS> configClass;
/**
* Constructs new key
*
* @param name config definition name
* @param configIdString Can be null.
* @param namespace namespace for this config definition
*/
public ConfigKey(String name, String configIdString, String namespace) {
this(name, configIdString, namespace, null);
}
/**
* Creates a new instance from the given class and configId
*
* @param clazz Config class
* @param configIdString config id, can be null.
*/
public ConfigKey(Class<CONFIGCLASS> clazz, String configIdString) {
this(getFieldFromClass(clazz, "CONFIG_DEF_NAME"),
configIdString,
getFieldFromClass(clazz, "CONFIG_DEF_NAMESPACE"),
clazz);
}
public ConfigKey(String name, String configIdString, String namespace, Class<CONFIGCLASS> clazz) {
if (name == null || name.isEmpty())
throw new ConfigurationRuntimeException("Config name cannot be null or empty!");
if (namespace == null || namespace.isEmpty())
throw new ConfigurationRuntimeException("Config namespace cannot be null or empty!");
this.name = name;
this.configId = (configIdString == null) ? "" : configIdString;
this.namespace = namespace;
this.configClass = clazz;
}
/**
* Comparison sort order: namespace, name, configId.
*/
@Override
public int compareTo(ConfigKey<?> o) {
if (!o.getNamespace().equals(getNamespace())) return getNamespace().compareTo(o.getNamespace());
if (!o.getName().equals(getName())) return getName().compareTo(o.getName());
return getConfigId().compareTo(o.getConfigId());
}
private static String getFieldFromClass(Class<?> clazz, String fieldName) {
try {
return (String) clazz.getField(fieldName).get(null);
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new ConfigurationRuntimeException("No such field '" + fieldName + "' in class " + clazz + ", or could not access field.", e);
}
}
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof ConfigKey)) {
return false;
}
ConfigKey<?> key = (ConfigKey<?>) o;
return (name.equals(key.name) &&
configId.equals(key.configId) &&
namespace.equals(key.namespace));
}
public int hashCode() {
int hash = 17;
hash = 37 * hash + name.hashCode();
hash = 37 * hash + configId.hashCode();
hash = 37 * hash + namespace.hashCode();
return hash;
}
public String getName() {
return name;
}
public String getConfigId() {
return configId;
}
public String getNamespace() {
return namespace;
}
public Class<CONFIGCLASS> getConfigClass() {
return configClass;
}
public String toString() { return "name=" + namespace + "." + name + ",configId=" + configId; }
public static ConfigKey<?> createFull(String name, String configId, String namespace) {
return new ConfigKey<>(name, configId, namespace, null);
}
}
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