- /*
- * Copyright 1999-2004 The Apache Software Foundation
- *
- * 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 org.apache.commons.jxpath.ri.compiler;
-
- import org.apache.commons.jxpath.ri.EvalContext;
-
- /**
- * A compile tree element containing a constant number or string.
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.8 $ $Date: 2004/02/29 14:17:39 $
- */
- public class Constant extends Expression {
-
- private Object value;
-
- public Constant(Number number) {
- this.value = number;
- }
-
- public Constant(String string) {
- this.value = string;
- }
-
- public Object compute(EvalContext context) {
- return value;
- }
-
- /**
- * Returns the value of the constant.
- */
- public Object computeValue(EvalContext context) {
- return value;
- }
-
- /**
- * Returns false
- */
- public boolean isContextDependent() {
- return false;
- }
-
- /**
- * Returns false
- */
- public boolean computeContextDependent() {
- return false;
- }
-
- public String toString() {
- if (value instanceof Number) {
- double doubleValue = ((Number) value).doubleValue();
- long longValue = ((Number) value).longValue();
- if (doubleValue == longValue) {
- return String.valueOf(longValue);
- }
- else {
- return String.valueOf(doubleValue);
- }
- }
- else {
- return "'" + value + "'";
- }
- }
- }