| /** |
| * 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.ambari.server.controller.predicate; |
| |
| import org.apache.ambari.server.controller.spi.Resource; |
| |
| import java.text.NumberFormat; |
| import java.text.ParsePosition; |
| |
| /** |
| * Predicate that compares a given value to a {@link Resource} property. |
| */ |
| public abstract class ComparisonPredicate<T> extends PropertyPredicate implements BasePredicate { |
| private final Comparable<T> value; |
| private final String stringValue; |
| private final Double doubleValue; |
| |
| protected ComparisonPredicate(String propertyId, Comparable<T> value) { |
| super(propertyId); |
| this.value = value; |
| |
| if (value instanceof Number) { |
| stringValue = null; |
| doubleValue = ((Number) value).doubleValue(); |
| } |
| else if (value instanceof String) { |
| stringValue = (String) value; |
| doubleValue = stringToDouble(stringValue); |
| } |
| else { |
| stringValue = null; |
| doubleValue = null; |
| } |
| } |
| |
| public Comparable<T> getValue() { |
| return value; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (!(o instanceof ComparisonPredicate)) return false; |
| if (!super.equals(o)) return false; |
| |
| ComparisonPredicate that = (ComparisonPredicate) o; |
| |
| return !(value != null ? !value.equals(that.value) : that.value != null); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = super.hashCode(); |
| result = 31 * result + (value != null ? value.hashCode() : 0); |
| return result; |
| } |
| |
| @Override |
| public void accept(PredicateVisitor visitor) { |
| visitor.acceptComparisonPredicate(this); |
| } |
| |
| protected int compareValueTo(Object propertyValue) throws ClassCastException{ |
| |
| if (doubleValue != null) { |
| if (propertyValue instanceof Number ) { |
| return (int) (doubleValue - ((Number) propertyValue).doubleValue()); |
| } |
| else if (propertyValue instanceof String) { |
| Double doubleFromString = stringToDouble((String) propertyValue); |
| if (doubleFromString != null) { |
| return (int) (doubleValue - doubleFromString); |
| } |
| } |
| } |
| if (stringValue != null) { |
| return stringValue.compareTo(propertyValue.toString()); |
| } |
| |
| return getValue().compareTo((T) propertyValue); |
| } |
| |
| private Double stringToDouble(String stringValue) { |
| ParsePosition parsePosition = new ParsePosition(0); |
| NumberFormat numberFormat = NumberFormat.getInstance(); |
| Number parsedNumber = numberFormat.parse((String) value, parsePosition); |
| |
| return parsePosition.getIndex() == stringValue.length() ? parsedNumber.doubleValue() : null; |
| } |
| |
| public abstract String getOperator(); |
| } |