| /* |
| * 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 freemarker.core; |
| |
| import freemarker.template.SimpleNumber; |
| import freemarker.template.TemplateException; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateNumberModel; |
| |
| final class UnaryPlusMinusExpression extends Expression { |
| |
| private final int TYPE_MINUS = 0; |
| private final int TYPE_PLUS = 1; |
| |
| private final Expression target; |
| private final boolean isMinus; |
| private static final Integer MINUS_ONE = Integer.valueOf(-1); |
| |
| UnaryPlusMinusExpression(Expression target, boolean isMinus) { |
| this.target = target; |
| this.isMinus = isMinus; |
| } |
| |
| @Override |
| TemplateModel _eval(Environment env) throws TemplateException { |
| TemplateNumberModel targetModel = null; |
| TemplateModel tm = target.eval(env); |
| try { |
| targetModel = (TemplateNumberModel) tm; |
| } catch (ClassCastException cce) { |
| throw new NonNumericalException(target, tm, env); |
| } |
| if (!isMinus) { |
| return targetModel; |
| } |
| target.assertNonNull(targetModel, env); |
| Number n = targetModel.getAsNumber(); |
| n = ArithmeticEngine.CONSERVATIVE_ENGINE.multiply(MINUS_ONE, n); |
| return new SimpleNumber(n); |
| } |
| |
| @Override |
| public String getCanonicalForm() { |
| String op = isMinus ? "-" : "+"; |
| return op + target.getCanonicalForm(); |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| return isMinus ? "-..." : "+..."; |
| } |
| |
| @Override |
| boolean isLiteral() { |
| return target.isLiteral(); |
| } |
| |
| @Override |
| protected Expression deepCloneWithIdentifierReplaced_inner( |
| String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) { |
| return new UnaryPlusMinusExpression( |
| target.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState), |
| isMinus); |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 2; |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| switch (idx) { |
| case 0: return target; |
| case 1: return Integer.valueOf(isMinus ? TYPE_MINUS : TYPE_PLUS); |
| default: throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| switch (idx) { |
| case 0: return ParameterRole.RIGHT_HAND_OPERAND; |
| case 1: return ParameterRole.AST_NODE_SUBTYPE; |
| default: throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| } |