/*
* 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.types.selectors;
import java.io.File;
import java.util.Enumeration;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.PropertyHelper;
/**
* This selector just holds one other selector and forwards all
* requests to it. It exists so that there is a single selector
* type that can exist outside of any targets, as an element of
* project. It overrides all of the reference stuff so that it
* works as expected. Note that this is the only selector you
* can reference.
*
* @since 1.5
*/
public class SelectSelector extends BaseSelectorContainer {
private Object ifCondition;
private Object unlessCondition;
/**
* @return a string describing this object
*/
public String toString() {
StringBuilder buf = new StringBuilder();
if (hasSelectors()) {
buf.append("{select");
if (ifCondition != null) {
buf.append(" if: ");
buf.append(ifCondition);
}
if (unlessCondition != null) {
buf.append(" unless: ");
buf.append(unlessCondition);
}
buf.append(" ");
buf.append(super.toString());
buf.append("}");
}
return buf.toString();
}
/**
* Performs the check for circular references and returns the
* referenced Selector.
*/
private SelectSelector getRef() {
Object o = getCheckedRef(this.getClass(), "SelectSelector");
return (SelectSelector) o;
}
/**
* Indicates whether there are any selectors here.
* @return whether any selectors are in this container
*/
@Override
public boolean hasSelectors() {
if (isReference()) {
return getRef().hasSelectors();
}
return super.hasSelectors();
}
/**
* Gives the count of the number of selectors in this container
* @return the number of selectors in this container
*/
@Override
public int selectorCount() {
if (isReference()) {
return getRef().selectorCount();
}
return super.selectorCount();
}
/**
* Returns the set of selectors as an array.
* @param p the current project
* @return an array of selectors in this container
*/
@Override
public FileSelector[] getSelectors(Project p) {
if (isReference()) {
return getRef().getSelectors(p);
}
return super.getSelectors(p);
}
/**
* Returns an enumerator for accessing the set of selectors.
* @return an enumerator that goes through each of the selectors
*/
@Override
public Enumeration<FileSelector> selectorElements() {
if (isReference()) {
return getRef().selectorElements();
}
return super.selectorElements();
}
/**
* Add a new selector into this container.
*
* @param selector the new selector to add
*/
@Override
public void appendSelector(FileSelector selector) {
if (isReference()) {
throw noChildrenAllowed();
}
super.appendSelector(selector);
}
/**
* Makes sure that there is only one entry, sets an error message if
* not.
*/
@Override
public void verifySettings() {
int cnt = selectorCount();
if (cnt < 0 || cnt > 1) {
setError("Only one selector is allowed within the <selector> tag");
}
}
/**
* Ensures that the selector passes the conditions placed
* on it with <code>if</code> and <code>unless</code>.
* @return true if conditions are passed
*/
public boolean passesConditions() {
PropertyHelper ph = PropertyHelper.getPropertyHelper(getProject());
return ph.testIfCondition(ifCondition)
&& ph.testUnlessCondition(unlessCondition);
}
/**
* Sets the if attribute to an expression which must evaluate to
* true or the name of an existing property for the
* selector to select any files.
* @param ifProperty the expression to check
* @since Ant 1.8.0
*/
public void setIf(Object ifProperty) {
this.ifCondition = ifProperty;
}
/**
* Sets the if attribute to an expression which must evaluate to
* true or the name of an existing property for the
* selector to select any files.
* @param ifProperty the expression to check
*/
public void setIf(String ifProperty) {
setIf((Object) ifProperty);
}
/**
* Sets the unless attribute to an expression which must evaluate to
* false or the name of a property which cannot exist for the
* selector to select any files.
* @param unlessProperty the expression to check
* @since Ant 1.8.0
*/
public void setUnless(Object unlessProperty) {
this.unlessCondition = unlessProperty;
}
/**
* Sets the unless attribute to an expression which must evaluate to
* false or the name of a property which cannot exist for the
* selector to select any files.
* @param unlessProperty the expression to check
*/
public void setUnless(String unlessProperty) {
setUnless((Object) unlessProperty);
}
/**
* Returns true (the file is selected) only if the if property (if any)
* exists, the unless property (if any) doesn't exist, and the
* contained selector (if any) selects the file. If there is no contained
* selector, return true (because we assume that the point was to test
* the if and unless conditions).
*
* @param basedir the base directory the scan is being done from
* @param filename the name of the file to check
* @param file a java.io.File object for the filename that the selector
* can use
* @return whether the file should be selected or not
*/
@Override
public boolean isSelected(File basedir, String filename, File file) {
validate();
// Deal with if and unless properties first
if (!(passesConditions())) {
return false;
}
Enumeration<FileSelector> e = selectorElements();
if (!e.hasMoreElements()) {
return true;
}
FileSelector f = e.nextElement();
return f.isSelected(basedir, filename, file);
}
}