com.orientechnologies.orient.core.sql.method.OSQLMethodLeft Maven / Gradle / Ivy
/*
* Copyright 2013 Orient Technologies.
* Copyright 2013 Geomatys.
*
* Licensed 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 com.orientechnologies.orient.core.sql.method;
import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.sql.method.misc.OAbstractSQLMethod;
/**
* Returns the first characters from the beginning of the string.
*
* @author Johann Sorel (Geomatys)
* @author Luca Garulli
*/
public class OSQLMethodLeft extends OAbstractSQLMethod {
public static final String NAME = "left";
public OSQLMethodLeft() {
super(NAME, 1, 1);
}
@Override
public String getSyntax() {
return "left()";
}
@Override
public Object execute(Object iThis, OIdentifiable iCurrentRecord, OCommandContext iContext, Object ioResult, Object[] iParams) {
if (iParams[0] == null || iThis == null) {
return null;
}
final String valueAsString = iThis.toString();
final int len = Integer.parseInt(iParams[0].toString());
return valueAsString.substring(0, len <= valueAsString.length() ? len : valueAsString.length());
}
}