software.amazon.awssdk.services.iotsitewise.endpoints.internal.Substring Maven / Gradle / Ivy
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The AWS Java SDK for Io T Site Wise module holds the client classes that are used for
communicating with Io T Site Wise.
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
* the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.services.iotsitewise.endpoints.internal;
import java.util.List;
import software.amazon.awssdk.annotations.SdkInternalApi;
@SdkInternalApi
public class Substring extends VarargFn {
public static final String ID = "substring";
public static final Identifier SUBSTRING = Identifier.of("substring");
private static final int EXPECTED_NUMBER_ARGS = 4;
public Substring(FnNode fnNode) {
super(fnNode);
}
@Override
public T acceptFnVisitor(FnVisitor visitor) {
return visitor.visitSubstring(this);
}
public static Substring ofExprs(Expr expr, int startIndex, int stopIndex, Boolean reverse) {
return new Substring(FnNode.ofExprs(ID, expr, Expr.of(startIndex), Expr.of(stopIndex), Expr.of(reverse)));
}
public Expr stringToParse() {
return expectVariableArgs(EXPECTED_NUMBER_ARGS).get(0);
}
public Expr startIndex() {
return expectVariableArgs(EXPECTED_NUMBER_ARGS).get(1);
}
public Expr stopIndex() {
return expectVariableArgs(EXPECTED_NUMBER_ARGS).get(2);
}
public Expr reverse() {
return expectVariableArgs(EXPECTED_NUMBER_ARGS).get(3);
}
@Override
public Value eval(Scope scope) {
List args = expectVariableArgs(EXPECTED_NUMBER_ARGS);
String str = args.get(0).eval(scope).expectString();
int startIndex = args.get(1).eval(scope).expectInt();
int stopIndex = args.get(2).eval(scope).expectInt();
boolean reverse = args.get(3).eval(scope).expectBool();
if (startIndex >= stopIndex || str.length() - 1 < stopIndex) {
return new Value.None();
}
String substr;
if (reverse) {
String reversedStr = new StringBuilder(str).reverse().toString();
substr = new StringBuilder(reversedStr.substring(startIndex, stopIndex)).reverse().toString();
} else {
substr = str.substring(startIndex, stopIndex);
}
return Value.fromStr(substr);
}
}
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