| /* |
| * 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.codehaus.groovy.ast.expr; |
| |
| import org.codehaus.groovy.ast.ClassHelper; |
| import org.codehaus.groovy.ast.GroovyCodeVisitor; |
| |
| /** |
| * Represents a constant expression such as null, true, false |
| * |
| * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> |
| */ |
| public class ConstantExpression extends Expression { |
| // The following fields are only used internally; every occurrence of a user-defined expression of the same kind |
| // has its own instance so as to preserve line information. Consequently, to test for such an expression, don't |
| // compare against the field but call isXXXExpression() instead. |
| public static final ConstantExpression NULL = new ConstantExpression(null); |
| public static final ConstantExpression TRUE = new ConstantExpression(Boolean.TRUE); |
| public static final ConstantExpression FALSE = new ConstantExpression(Boolean.FALSE); |
| public static final ConstantExpression EMPTY_STRING = new ConstantExpression(""); |
| public static final ConstantExpression PRIM_TRUE = new ConstantExpression(Boolean.TRUE, true); |
| public static final ConstantExpression PRIM_FALSE = new ConstantExpression(Boolean.FALSE, true); |
| //public static final Expression EMPTY_ARRAY = new PropertyExpression(new ClassExpression(ArgumentListExpression.class.getName()), "EMPTY_ARRAY"); |
| |
| // the following fields are only used internally; there are no user-defined expressions of the same kind |
| public static final ConstantExpression VOID = new ConstantExpression(Void.class); |
| public static final ConstantExpression EMPTY_EXPRESSION = new ConstantExpression(null); |
| |
| private final Object value; |
| private String constantName; |
| |
| public ConstantExpression(Object value) { |
| this(value,false); |
| } |
| |
| public ConstantExpression(Object value, boolean keepPrimitive) { |
| this.value = value; |
| if (value != null) { |
| if (keepPrimitive) { |
| if (value instanceof Integer) { |
| setType(ClassHelper.int_TYPE); |
| } else if (value instanceof Long) { |
| setType(ClassHelper.long_TYPE); |
| } else if (value instanceof Boolean) { |
| setType(ClassHelper.boolean_TYPE); |
| } else if (value instanceof Double) { |
| setType(ClassHelper.double_TYPE); |
| } else if (value instanceof Float) { |
| setType(ClassHelper.float_TYPE); |
| } else if (value instanceof Character) { |
| setType(ClassHelper.char_TYPE); |
| } else { |
| setType(ClassHelper.make(value.getClass())); |
| } |
| //TODO: more cases here |
| } else { |
| setType(ClassHelper.make(value.getClass())); |
| } |
| } |
| } |
| |
| public String toString() { |
| return "ConstantExpression[" + value + "]"; |
| } |
| |
| public void visit(GroovyCodeVisitor visitor) { |
| visitor.visitConstantExpression(this); |
| } |
| |
| public Expression transformExpression(ExpressionTransformer transformer) { |
| return this; |
| } |
| |
| /** |
| * @return the value of this constant expression |
| */ |
| public Object getValue() { |
| return value; |
| } |
| |
| public String getText() { |
| return (value == null) ? "null" : value.toString(); |
| } |
| |
| public String getConstantName() { |
| return constantName; |
| } |
| |
| public void setConstantName(String constantName) { |
| this.constantName = constantName; |
| } |
| |
| public boolean isNullExpression() { |
| return value == null; |
| } |
| |
| public boolean isTrueExpression() { |
| return Boolean.TRUE.equals(value); |
| } |
| |
| public boolean isFalseExpression() { |
| return Boolean.FALSE.equals(value); |
| } |
| |
| public boolean isEmptyStringExpression() { |
| return "".equals(value); |
| } |
| } |