| /* |
| * 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.apache.tools.ant.taskdefs.condition; |
| |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.ProjectComponent; |
| import org.apache.tools.ant.types.Reference; |
| |
| /** |
| * Condition that tests whether a given reference has been defined. |
| * |
| * <p>Optionally tests whether it is of a given type/class.</p> |
| * |
| * @since Ant 1.6 |
| */ |
| public class IsReference extends ProjectComponent implements Condition { |
| private Reference ref; |
| private String type; |
| |
| /** |
| * Set the refid attribute. |
| * |
| * @param r a Reference value |
| */ |
| public void setRefid(Reference r) { |
| ref = r; |
| } |
| |
| /** |
| * Set the type attribute. This is optional attribute. |
| * |
| * @param type an ant component type name |
| */ |
| public void setType(String type) { |
| this.type = type; |
| } |
| |
| /** |
| * @return true if the reference exists and if type is set, if |
| * the reference is the same type |
| * @exception BuildException if an error occurs |
| */ |
| public boolean eval() throws BuildException { |
| if (ref == null) { |
| throw new BuildException("No reference specified for isreference " |
| + "condition"); |
| } |
| |
| Object o = getProject().getReference(ref.getRefId()); |
| |
| if (o == null) { |
| return false; |
| } else if (type == null) { |
| return true; |
| } else { |
| Class typeClass = |
| (Class) getProject().getDataTypeDefinitions().get(type); |
| |
| if (typeClass == null) { |
| typeClass = |
| (Class) getProject().getTaskDefinitions().get(type); |
| } |
| |
| if (typeClass == null) { |
| // don't know the type, should throw exception instead? |
| return false; |
| } |
| |
| return typeClass.isAssignableFrom(o.getClass()); |
| } |
| } |
| |
| } |