com.baidu.bigpipe.spring

类 PlaceholderResolver

java.lang.Object

com.baidu.bigpipe.spring.PlaceholderResolver

public class PlaceholderResolver
extends Object

字符串占位符解析工作类.
例如: String testStr = "abc${ab}" 如果ab="ddd",则解析后结果为 abcddd

 example:
     public static void main(String[] args) {
        final Map placeholderVals = new HashMap(5);
        placeholderVals.put("key1", "china");
        placeholderVals.put("key2", "3");
        placeholderVals.put("key3", "beijin");

        String testStr = "hello ${key1}";

        PlaceholderResolver resolver = new PlaceholderResolver(new PlaceholderResolved() {

            public String doResolved(String placeholder) {
                System.out.println("find placeholder:" + placeholder);
                return placeholderVals.get(placeholder);
            }
        });
        resolver.setPlaceholderPrefix("${");
        resolver.setPlaceholderSuffix("}");

        System.out.println(resolver.doParse(testStr));

        testStr = "hello ${key${key2}}";
        System.out.println(resolver.doParse(testStr));
    }
    

从以下版本开始:

2.17

作者:

xiemalin

字段概要

字段

限定符和类型	字段和说明
static String	DEFAULT_PLACEHOLDER_PREFIX Default placeholder prefix: "${"
static String	DEFAULT_PLACEHOLDER_SUFFIX Default placeholder suffix: "}"

构造器概要

构造器

构造器和说明
PlaceholderResolver(PlaceholderResolved resolvedInterceptor) Constructor method

方法概要

方法

限定符和类型	方法和说明
String	doParse(String strVal) Do parser placeholder action.
boolean	hasPlaceHolder(String strVal) test if target string contains placeholderPrefix
protected String	parseStringValue(String strVal, Set<String> visitedPlaceholders) Parse the given String value recursively, to be able to resolve nested placeholders (when resolved property values in turn contain placeholders again).
void	setPlaceholderPrefix(String placeholderPrefix)
void	setPlaceholderSuffix(String placeholderSuffix)
static boolean	substringMatch(CharSequence str, int index, CharSequence substring) Test whether the given string matches the given substring at the given index.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

DEFAULT_PLACEHOLDER_PREFIX

public static final String DEFAULT_PLACEHOLDER_PREFIX

Default placeholder prefix: "${"

另请参阅:

常量字段值

DEFAULT_PLACEHOLDER_SUFFIX

public static final String DEFAULT_PLACEHOLDER_SUFFIX

Default placeholder suffix: "}"

另请参阅:

常量字段值

构造器详细资料

PlaceholderResolver

public PlaceholderResolver(PlaceholderResolved resolvedInterceptor)

Constructor method

参数:

resolvedInterceptor - PlaceholderResolved can not be null.

方法详细资料

doParse

public String doParse(String strVal)

Do parser placeholder action.

参数:

strVal - target string to parser

返回:

target string after placeholder parse

hasPlaceHolder

public boolean hasPlaceHolder(String strVal)

test if target string contains placeholderPrefix

参数:

strVal - target string to test

返回:

true if string contains placeholderPrefix

parseStringValue

protected String parseStringValue(String strVal,
                      Set<String> visitedPlaceholders)

Parse the given String value recursively, to be able to resolve nested placeholders (when resolved property values in turn contain placeholders again).

参数:

strVal - the String value to parse

visitedPlaceholders - the placeholders that have already been visited during the current resolution attempt (used to detect circular references between placeholders). Only non-null if we're parsing a nested placeholder.

substringMatch

public static boolean substringMatch(CharSequence str,
                     int index,
                     CharSequence substring)

Test whether the given string matches the given substring at the given index.

参数:

str - the original string (or StringBuffer)

index - the index in the original string to start matching against

substring - the substring to match at the given index

setPlaceholderPrefix

public void setPlaceholderPrefix(String placeholderPrefix)

参数:

placeholderPrefix - the placeholderPrefix to set

setPlaceholderSuffix

public void setPlaceholderSuffix(String placeholderSuffix)

参数:

placeholderSuffix - the placeholderSuffix to set