Ant 条件判断 if

转载自ant 条件判断 condition 


最近收到一个ticket，用ant写个build.xml，用到condition，作笔记如下： 
basic elements: istrue isfalse not and or xor available isset equals  filesmatch 
1、istrue isfalse:断言 真 假 

<project name="testCondition">
    <target name="test">
        <condition property="scondition">
            <istrue value="true"/>
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

2、逻辑运算 
2.1、not 逻辑非 

<project name="testCondition">
    <target name="test">
        <condition property="scondition">
            <not>
                <istrue value="true"/>
            </not>
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

2.2、and 逻辑与 

<project name="testCondition">
    <target name="test">
        <condition property="scondition">
            <and>
                <istrue value="true"/>
                <istrue value="false"/>
            </and>
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

2.3、or 逻辑或 xor异或 (语法上与and类似) 
3、available 是否可用 

<project name="testCondition">
    <path id="all.test.classes">
        <pathelement location="bin"/>
    </path>
    <target name="test">
        <condition property="scondition">
            <!--在指定的classpath路径下是否存在资源 TestTest.class-->
            <available resource="TestTest.class">
                <classpath refid="all.test.classes" />
            </available>
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

4、isset 指定属性是否存在 

<project name="testCondition">
    <!--属性也可以通过ant参数-D来设置-->
    <property name="name" value="this is name" />
    <target name="test">
        <condition property="scondition">
            <!--如果属性name不存在则返回false-->
            <isset property="name" />
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

5、equals 是否相等 

<project name="testCondition">
    <!--属性也可以通过ant参数-D来设置-->
    <property name="name" value="this is name" />
    <target name="test">
        <condition property="scondition">
            <!--如果arg1的值与arg2的值相等返回true，否则为false-->
            <equals arg1="${name}" arg2="this is name" />
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>

6、filesmatch 比较文件 

<project name="testCondition">
    <target name="test">
        <condition property="scondition">
            <!--如果file1所代表的文件与file2所代表的文件相等返回true，否则为false-->
            <filesmatch file1="testfile1.txt" file2="testfile2.txt" />
        </condition>
        <antcall target="isTrue">
        </antcall>
        <antcall target="isFalse">
        </antcall>
    </target>
    <target name="isTrue" if="scondition">
        <echo>is ture</echo>
    </target>
    <target name="isFalse" unless="scondition">
        <echo>is false</echo>
    </target>
</project>