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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 com.android.ant;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Sequential;
import org.apache.tools.ant.taskdefs.condition.And;
/**
* If (condition) then: {@link Sequential} else: {@link Sequential}.
*
* In XML:
* <if condition="${prop with a boolean value}">
* <then>
* </then>
* <else>
* </else>
* </if>
*
* or
*
* <if>
* <condition>
* ...
* </condition>
* <then>
* </then>
* <else>
* </else>
* </if>
*
* both <then> and <else> behave like <sequential>.
* <condition> behaves like an <and> condition.
*
* The presence of both <then> and <else> is not required, but one of them must be present.
* <if condition="${some.condition}">
* <else>
* </else>
* </if>
* is perfectly valid.
*
*/
public class IfElseTask extends Task {
private boolean mCondition;
private boolean mConditionIsSet = false;
private And mAnd;
private Sequential mThen;
private Sequential mElse;
/**
* Sets the condition value
*/
public void setCondition(boolean condition) {
mCondition = condition;
mConditionIsSet = true;
}
/**
* Creates and returns the <condition> node which is basically a <and>.
*/
public Object createCondition() {
if (mConditionIsSet) {
throw new BuildException("Cannot use both condition attribute and <condition> element");
}
mAnd = new And();
mAnd.setProject(getProject());
return mAnd;
}
/**
* Creates and returns the <then> {@link Sequential}
*/
public Object createThen() {
mThen = new Sequential();
return mThen;
}
/**
* Creates and returns the <else> {@link Sequential}
*/
public Object createElse() {
mElse = new Sequential();
return mElse;
}
@Override
public void execute() throws BuildException {
if (mConditionIsSet == false && mAnd == null) {
throw new BuildException("condition attribute or element must be set.");
}
if (mAnd != null) {
mCondition = mAnd.eval();
}
// need at least one.
if (mThen == null && mElse == null) {
throw new BuildException("Need at least <then> or <else>");
}
if (mCondition) {
if (mThen != null) {
mThen.execute();
}
} else {
if (mElse != null) {
mElse.execute();
}
}
}
}
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