110 lines
3.5 KiB
Java
110 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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*/
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package org.apache.ant.antunit;
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import org.apache.tools.ant.BuildException;
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import org.apache.tools.ant.Project;
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import org.apache.tools.ant.ProjectComponent;
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import org.apache.tools.ant.taskdefs.condition.Condition;
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import org.apache.tools.ant.types.Resource;
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import org.apache.tools.ant.types.ResourceCollection;
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/**
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* A condition that tests whether a given resource exists.
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*
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* @since AntUnit 1.2
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*/
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public class ResourceExists extends ProjectComponent implements Condition {
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private Resource resource;
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private String refid;
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/**
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* The resource to check as attribute.
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*
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* <p>Exactly one resource must be specfied either as attribute or
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* nested element.</p>
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* @param r resource to check
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*/
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public void setResource(Resource r) {
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onlyOne();
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resource = r;
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}
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/**
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* The resource to check as a refid.
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* @since AntUnit 1.3
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* @param refid resource to check as a refid
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*/
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public void setRefid(String refid) {
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onlyOne();
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this.refid = refid;
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}
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/**
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* The resource to check as nested element.
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*
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* <p>Exactly one resource must be specfied either as attribute or
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* nested element.</p>
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* @param r resource to check
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*/
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public void add(Resource r) {
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setResource(r);
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}
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public boolean eval() {
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if (resource == null && refid == null) {
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throw new BuildException("You must specify a resource.");
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}
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Resource r = resource != null ? resource : expandRefId();
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log("Checking: " + r, Project.MSG_VERBOSE);
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return r.isExists();
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}
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private void onlyOne() {
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if (resource != null || refid != null) {
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throw new BuildException("Only one resource can be tested.");
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}
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}
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// logic stolen from Ant's ResourceContains condition
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private Resource expandRefId() {
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if (getProject() == null) {
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throw new BuildException("Cannot retrieve refid; project unset");
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}
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Object o = getProject().getReference(refid);
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if (!(o instanceof Resource)) {
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if (o instanceof ResourceCollection) {
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ResourceCollection rc = (ResourceCollection) o;
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if (rc.size() == 1) {
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o = rc.iterator().next();
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} else {
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throw new BuildException("Referred resource collection must"
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+ " contain exactly one resource.");
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}
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} else {
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throw new BuildException("'" + refid + "' is not a resource but "
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+ String.valueOf(o));
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}
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}
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return (Resource) o;
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}
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}
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