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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.script;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.xcontent.ConstructingObjectParser;
import org.elasticsearch.common.xcontent.ToXContentObject;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import static org.elasticsearch.common.xcontent.ConstructingObjectParser.constructorArg;
public class ScriptContextInfo implements ToXContentObject, Writeable {
public final String name;
public final ScriptMethodInfo execute;
public final Set getters;
private static final String NAME_FIELD = "name";
private static final String METHODS_FIELD = "methods";
// ScriptService constructor
ScriptContextInfo(String name, Class clazz) {
this.name = name;
this.execute = ScriptMethodInfo.executeFromContext(clazz);
this.getters = Collections.unmodifiableSet(ScriptMethodInfo.gettersFromContext(clazz));
}
// Deserialization constructor
ScriptContextInfo(String name, List methods) {
this.name = Objects.requireNonNull(name);
Objects.requireNonNull(methods);
String executeName = "execute";
String getName = "get";
// ignored instead of error, so future implementations can add methods. Same as ScriptContextInfo(String, Class).
String otherName = "other";
Map> methodTypes = methods.stream().collect(Collectors.groupingBy(
m -> {
if (m.name.equals(executeName)) {
return executeName;
} else if (m.name.startsWith(getName) && m.parameters.size() == 0) {
return getName;
}
return otherName;
}
));
if (methodTypes.containsKey(executeName) == false) {
throw new IllegalArgumentException("Could not find required method [" + executeName + "] in [" + name + "], found " +
methods.stream().map(m -> m.name).sorted().collect(Collectors.joining(", ", "[", "]")));
} else if ((methodTypes.get(executeName).size() != 1)) {
throw new IllegalArgumentException("Cannot have multiple [execute] methods in [" + name + "], found [" +
methodTypes.get(executeName).size() + "]"
);
}
this.execute = methodTypes.get(executeName).get(0);
if (methodTypes.containsKey(getName)) {
this.getters = Collections.unmodifiableSet(new HashSet<>(methodTypes.get(getName)));
} else {
this.getters = Collections.emptySet();
}
}
// Test constructor
public ScriptContextInfo(String name, ScriptMethodInfo execute, Set getters) {
this.name = Objects.requireNonNull(name);
this.execute = Objects.requireNonNull(execute);
this.getters = Objects.requireNonNull(getters);
}
public ScriptContextInfo(StreamInput in) throws IOException {
this.name = in.readString();
this.execute = new ScriptMethodInfo(in);
int numGetters = in.readInt();
Set getters = new HashSet<>(numGetters);
for (int i = 0; i < numGetters; i++) {
getters.add(new ScriptMethodInfo(in));
}
this.getters = Collections.unmodifiableSet(getters);
}
public void writeTo(StreamOutput out) throws IOException {
out.writeString(name);
execute.writeTo(out);
out.writeInt(getters.size());
for (ScriptMethodInfo getter: getters) {
getter.writeTo(out);
}
}
public String getName() {
return this.name;
}
public List methods() {
ArrayList methods = new ArrayList<>();
methods.add(this.execute);
methods.addAll(this.getters);
return Collections.unmodifiableList(methods);
}
@SuppressWarnings("unchecked")
public static final ConstructingObjectParser PARSER =
new ConstructingObjectParser<>("script_context_info", true,
(m, name) -> new ScriptContextInfo((String) m[0], (List) m[1])
);
static {
PARSER.declareString(constructorArg(), new ParseField(NAME_FIELD));
PARSER.declareObjectArray(constructorArg(),
(parser, ctx) -> ScriptMethodInfo.PARSER.apply(parser, ctx),
new ParseField(METHODS_FIELD));
}
public static ScriptContextInfo fromXContent(XContentParser parser) throws IOException {
return PARSER.parse(parser, null);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ScriptContextInfo that = (ScriptContextInfo) o;
return Objects.equals(name, that.name) &&
Objects.equals(execute, that.execute) &&
Objects.equals(getters, that.getters);
}
@Override
public int hashCode() {
return Objects.hash(name, execute, getters);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject().field(NAME_FIELD, name).startArray(METHODS_FIELD);
execute.toXContent(builder, params);
for (ScriptMethodInfo method: getters.stream().sorted(Comparator.comparing(g -> g.name)).collect(Collectors.toList())) {
method.toXContent(builder, params);
}
return builder.endArray().endObject();
}
public static class ScriptMethodInfo implements ToXContentObject, Writeable {
public final String name, returnType;
public final List parameters;
static final String RETURN_TYPE_FIELD = "return_type";
static final String PARAMETERS_FIELD = "params";
public ScriptMethodInfo(String name, String returnType, List parameters) {
this.name = Objects.requireNonNull(name);
this.returnType = Objects.requireNonNull(returnType);
this.parameters = Collections.unmodifiableList(Objects.requireNonNull(parameters));
}
public ScriptMethodInfo(StreamInput in) throws IOException {
this.name = in.readString();
this.returnType = in.readString();
int numParameters = in.readInt();
ArrayList parameters = new ArrayList<>(numParameters);
for (int i = 0; i < numParameters; i++) {
parameters.add(new ParameterInfo(in));
}
this.parameters = Collections.unmodifiableList(parameters);
}
public void writeTo(StreamOutput out) throws IOException {
out.writeString(name);
out.writeString(returnType);
out.writeInt(parameters.size());
for (ParameterInfo parameter: parameters) {
parameter.writeTo(out);
}
}
@SuppressWarnings("unchecked")
private static final ConstructingObjectParser PARSER =
new ConstructingObjectParser<>("method", true,
(m, name) -> new ScriptMethodInfo((String) m[0], (String) m[1], (List) m[2])
);
static {
PARSER.declareString(constructorArg(), new ParseField(NAME_FIELD));
PARSER.declareString(constructorArg(), new ParseField(RETURN_TYPE_FIELD));
PARSER.declareObjectArray(constructorArg(),
(parser, ctx) -> ParameterInfo.PARSER.apply(parser, ctx),
new ParseField(PARAMETERS_FIELD));
}
public static ScriptMethodInfo fromXContent(XContentParser parser) throws IOException {
return PARSER.parse(parser, null);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ScriptMethodInfo that = (ScriptMethodInfo) o;
return Objects.equals(name, that.name) &&
Objects.equals(returnType, that.returnType) &&
Objects.equals(parameters, that.parameters);
}
@Override
public int hashCode() {
return Objects.hash(name, returnType, parameters);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject().field(NAME_FIELD, name).field(RETURN_TYPE_FIELD, returnType).startArray(PARAMETERS_FIELD);
for (ParameterInfo parameter: parameters) {
parameter.toXContent(builder, params);
}
return builder.endArray().endObject();
}
public static class ParameterInfo implements ToXContentObject, Writeable {
public final String type, name;
public static final String TYPE_FIELD = "type";
public ParameterInfo(String type, String name) {
this.type = Objects.requireNonNull(type);
this.name = Objects.requireNonNull(name);
}
public ParameterInfo(StreamInput in) throws IOException {
this.type = in.readString();
this.name = in.readString();
}
public void writeTo(StreamOutput out) throws IOException {
out.writeString(type);
out.writeString(name);
}
private static final ConstructingObjectParser PARSER =
new ConstructingObjectParser<>("parameters", true,
(p) -> new ParameterInfo((String)p[0], (String)p[1])
);
static {
PARSER.declareString(constructorArg(), new ParseField(TYPE_FIELD));
PARSER.declareString(constructorArg(), new ParseField(NAME_FIELD));
}
public static ParameterInfo fromXContent(XContentParser parser) throws IOException {
return PARSER.parse(parser, null);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
return builder.startObject().field(TYPE_FIELD, this.type).field(NAME_FIELD, this.name).endObject();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ParameterInfo that = (ParameterInfo) o;
return Objects.equals(type, that.type) &&
Objects.equals(name, that.name);
}
@Override
public int hashCode() {
return Objects.hash(type, name);
}
}
static ScriptMethodInfo executeFromContext(Class clazz) {
Method execute = null;
String name = "execute";
// See ScriptContext.findMethod
for (Method method : clazz.getMethods()) {
if (method.getName().equals(name)) {
if (execute != null) {
throw new IllegalArgumentException("Cannot have multiple [" + name + "] methods on class [" +
clazz.getName() + "]");
}
execute = method;
}
}
if (execute == null) {
throw new IllegalArgumentException("Could not find required method [" + name + "] on class [" + clazz.getName() + "]");
}
Class returnTypeClazz = execute.getReturnType();
String returnType = returnTypeClazz.getTypeName();
Class[] parameterTypes = execute.getParameterTypes();
List parameters = new ArrayList<>();
if (parameterTypes.length > 0) {
// TODO(stu): ensure empty/no PARAMETERS if parameterTypes.length == 0?
String parametersFieldName = "PARAMETERS";
// See ScriptClassInfo.readArgumentNamesConstant
Field parameterNamesField;
try {
parameterNamesField = clazz.getField(parametersFieldName);
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException("Could not find field [" + parametersFieldName + "] on instance class [" +
clazz.getName() + "] but method [" + name + "] has [" + parameterTypes.length + "] parameters");
}
if (!parameterNamesField.getType().equals(String[].class)) {
throw new IllegalArgumentException("Expected a constant [String[] PARAMETERS] on instance class [" +
clazz.getName() + "] for method [" + name + "] with [" + parameterTypes.length + "] parameters, found [" +
parameterNamesField.getType().getTypeName() + "]");
}
String[] argumentNames;
try {
argumentNames = (String[]) parameterNamesField.get(null);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new IllegalArgumentException("Error trying to read [" + clazz.getName() + "#ARGUMENTS]", e);
}
if (argumentNames.length != parameterTypes.length) {
throw new IllegalArgumentException("Expected argument names [" + argumentNames.length +
"] to have the same arity [" + parameterTypes.length + "] for method [" + name +
"] of class [" + clazz.getName() + "]");
}
for (int i = 0; i < argumentNames.length; i++) {
parameters.add(new ParameterInfo(parameterTypes[i].getTypeName(), argumentNames[i]));
}
}
return new ScriptMethodInfo(name, returnType, parameters);
}
static Set gettersFromContext(Class clazz) {
// See ScriptClassInfo(PainlessLookup painlessLookup, Class baseClass)
HashSet getters = new HashSet<>();
for (java.lang.reflect.Method m : clazz.getMethods()) {
if (!m.isDefault() &&
m.getName().startsWith("get") &&
!m.getName().equals("getClass") &&
!Modifier.isStatic(m.getModifiers()) &&
m.getParameters().length == 0) {
getters.add(new ScriptMethodInfo(m.getName(), m.getReturnType().getTypeName(), new ArrayList<>()));
}
}
return getters;
}
}
}