/* Copyright 2013 The jeo project. 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. * 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 io.jeo.filter; /** * Static expression that evaluates to a literal value. * * @author Justin Deoliveira, OpenGeo */ public class Literal implements Expression { Object value; public Literal(Object value) { this.value = value; } @Override public Object evaluate(Object obj) { return value; } @Override public <R> R accept(FilterVisitor<R> visitor, Object obj) { return visitor.visit(this, obj); } @Override public String toString() { return value != null ? value.toString() : "null"; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((value == null) ? 0 : value.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Literal other = (Literal) obj; if (value == null) { if (other.value != null) return false; } else if (!value.equals(other.value)) return false; return true; } }