| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.metron.stellar.common; |
| |
| |
| import java.util.Map; |
| |
| public class StellarAssignment implements Map.Entry<String, Object>{ |
| private String variable; |
| private String statement; |
| |
| public StellarAssignment(String variable, String statement) { |
| this.variable = variable; |
| this.statement = statement; |
| } |
| |
| public String getVariable() { |
| return variable; |
| } |
| |
| public String getStatement() { |
| return statement; |
| } |
| |
| public static boolean isAssignment(String statement) { |
| return statement != null && statement.contains(":="); |
| } |
| |
| public static StellarAssignment from(String statement) { |
| if(statement == null || statement.length() == 0) { |
| return new StellarAssignment(null, null); |
| } |
| char prev = statement.charAt(0); |
| char curr; |
| String variable = "" + prev; |
| String s = null; |
| boolean isAssignment = false; |
| for(int i = 1;i < statement.length();++i,prev=curr) { |
| curr = statement.charAt(i); |
| if(prev == ':' && curr == '=') { |
| isAssignment = true; |
| variable = variable.substring(0, variable.length() - 1); |
| s = ""; |
| continue; |
| } |
| if(!isAssignment) { |
| variable += curr; |
| } |
| else { |
| s += curr; |
| } |
| } |
| |
| if(!isAssignment) { |
| s = variable; |
| variable = null; |
| } |
| |
| if(s != null) { |
| s = s.trim(); |
| } |
| if(variable != null) { |
| variable = variable.trim(); |
| } |
| return new StellarAssignment(variable, s); |
| } |
| |
| /** |
| * Returns the key corresponding to this entry. |
| * |
| * @return the key corresponding to this entry |
| * @throws IllegalStateException implementations may, but are not |
| * required to, throw this exception if the entry has been |
| * removed from the backing map. |
| */ |
| @Override |
| public String getKey() { |
| return variable; |
| } |
| |
| /** |
| * Returns the value corresponding to this entry. If the mapping |
| * has been removed from the backing map (by the iterator's |
| * <tt>remove</tt> operation), the results of this call are undefined. |
| * |
| * @return the value corresponding to this entry |
| * @throws IllegalStateException implementations may, but are not |
| * required to, throw this exception if the entry has been |
| * removed from the backing map. |
| */ |
| @Override |
| public Object getValue() { |
| return statement; |
| } |
| |
| /** |
| * Replaces the value corresponding to this entry with the specified |
| * value (optional operation). (Writes through to the map.) The |
| * behavior of this call is undefined if the mapping has already been |
| * removed from the map (by the iterator's <tt>remove</tt> operation). |
| * |
| * @param value new value to be stored in this entry |
| * @return old value corresponding to the entry |
| * @throws UnsupportedOperationException if the <tt>put</tt> operation |
| * is not supported by the backing map |
| * @throws ClassCastException if the class of the specified value |
| * prevents it from being stored in the backing map |
| * @throws NullPointerException if the backing map does not permit |
| * null values, and the specified value is null |
| * @throws IllegalArgumentException if some property of this value |
| * prevents it from being stored in the backing map |
| * @throws IllegalStateException implementations may, but are not |
| * required to, throw this exception if the entry has been |
| * removed from the backing map. |
| */ |
| @Override |
| public String setValue(Object value) { |
| throw new UnsupportedOperationException("Assignments are immutable."); |
| } |
| } |