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Java lang extensions for java6+, a supplement to , replacement of a Guava, commons-lang. Core utilities, Collection utilities, IO utilities, Cache, Configuration library ...

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package com.jn.langx.text.xml;


import com.jn.langx.util.Strings;
import com.jn.langx.util.collection.Pipeline;
import com.jn.langx.util.function.Function;

import java.util.List;

/**
 * 根节点：/ 

 * 当前节点：.

 * 父节点：..

 * 父子关系: /

 * 元素属性：@

 * 元素节点：元素名

 * 所有子元素节点：*

 * 所有属性：@*

 * 并列关系：|

 * 约束关系：[]

 *
 *
 * 避免注入的方案：
 * https://cheatsheetseries.owasp.org/cheatsheets/Injection_Prevention_in_Java_Cheat_Sheet.html
 *
 * @author jinuo.fang
 */
public class XPaths {


    // ---- 属性判断

    /**
     * 不包括指定属性
     *
     * @param attrName attribute name
     * @return expression
     */
    public static String notContainsAttr(String attrName) {
        return "name(@" + attrName + ")=''";
    }

    public static String attrNotEquals(String attrName, String value) {
        return "@" + attrName + "!=" + value;
    }

    // ---------------------------------逻辑表达式--------------------------------------//

    /**
     * ( a or b ) and c
     *
     * @param expA
     * @param expB
     * @param expC
     * @return expression
     */
    public static String aorB_and_C(String expA, String expB, String expC) {
        return "(" + expA + " or " + expB + ") and " + expC;
    }

    /**
     * a or ( b and c)
     *
     * @param expA
     * @param expB
     * @param expC
     * @return expression
     */
    public static String a_or_BandC(String expA, String expB, String expC) {
        return expA + " or (" + expB + " and " + expC + ")";
    }

    public static String useNamespace(String xpathExpr, final String namespacePrefix) {
        String[] segments = Strings.split(xpathExpr, "/");
        List prefixedSegments = Pipeline.of(segments).clearNulls().map(new Function() {
            @Override
            public String apply(String segment) {
                return namespacePrefix + ":" + segment;
            }
        }).asList();
        return "/" + Strings.join("/", prefixedSegments);
    }
}