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Groovy example source code file (ConstantExpression.java)
The Groovy ConstantExpression.java source code/* * Copyright 2003-2007 the original author or authors. * * 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.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 * @version $Revision: 21186 $ */ 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 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 Boolean) { setType(ClassHelper.boolean_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); } } Other Groovy examples (source code examples)Here is a short list of links related to this Groovy ConstantExpression.java source code file: |
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