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[#2011] Implement some micro-optimisations in DefaultRenderContext - 3.

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Escaping of quoted literals
This commit is contained in:
Lukas Eder 2012-12-14 13:25:23 +01:00
parent 2268afa4ab
commit 7b295878e1
2 changed files with 90 additions and 3 deletions
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6
jOOQ/src/main/java/org/jooq/impl/DefaultRenderContext.java
View File

@ -288,7 +288,7 @@ class DefaultRenderContext extends AbstractContext<RenderContext> implements Ren
// MySQL supports backticks and double quotes
case MYSQL:
sql("`").sql(literal.replace("`", "``")).sql("`");
sql("`").sql(StringUtils.replace(literal, "`", "``")).sql("`");
break;
// SQLite is supposed to support all sorts of delimiters, but it
@ -301,7 +301,7 @@ class DefaultRenderContext extends AbstractContext<RenderContext> implements Ren
case ASE:
case SQLSERVER:
case SYBASE:
sql("[").sql(literal.replace("]", "]]")).sql("]");
sql("[").sql(StringUtils.replace(literal, "]", "]]")).sql("]");
break;
// Most dialects implement the SQL standard, using double quotes
@ -315,7 +315,7 @@ class DefaultRenderContext extends AbstractContext<RenderContext> implements Ren
case ORACLE:
case POSTGRES:
default:
sql('"').sql(literal.replace("\"", "\"\"")).sql('"');
sql('"').sql(StringUtils.replace(literal, "\"", "\"\"")).sql('"');
break;
}
}

87
jOOQ/src/main/java/org/jooq/tools/StringUtils.java
View File

@ -120,6 +120,12 @@ public final class StringUtils {
*/
public static final String EMPTY = "";
/**
* Represents a failed index search.
* @since 2.1
*/
public static final int INDEX_NOT_FOUND = -1;
/**
* <p>The maximum size to which the padding constant(s) can expand.</p>
*/
@ -683,6 +689,87 @@ public final class StringUtils {
return false;
}
/**
* <p>Replaces all occurrences of a String within another String.</p>
*
* <p>A {@code null} reference passed to this method is a no-op.</p>
*
* <pre>
* StringUtils.replace(null, *, *) = null
* StringUtils.replace("", *, *) = ""
* StringUtils.replace("any", null, *) = "any"
* StringUtils.replace("any", *, null) = "any"
* StringUtils.replace("any", "", *) = "any"
* StringUtils.replace("aba", "a", null) = "aba"
* StringUtils.replace("aba", "a", "") = "b"
* StringUtils.replace("aba", "a", "z") = "zbz"
* </pre>
*
* @see #replace(String text, String searchString, String replacement, int max)
* @param text text to search and replace in, may be null
* @param searchString the String to search for, may be null
* @param replacement the String to replace it with, may be null
* @return the text with any replacements processed,
* {@code null} if null String input
*/
public static String replace(String text, String searchString, String replacement) {
return replace(text, searchString, replacement, -1);
}
/**
* <p>Replaces a String with another String inside a larger String,
* for the first {@code max} values of the search String.</p>
*
* <p>A {@code null} reference passed to this method is a no-op.</p>
*
* <pre>
* StringUtils.replace(null, *, *, *) = null
* StringUtils.replace("", *, *, *) = ""
* StringUtils.replace("any", null, *, *) = "any"
* StringUtils.replace("any", *, null, *) = "any"
* StringUtils.replace("any", "", *, *) = "any"
* StringUtils.replace("any", *, *, 0) = "any"
* StringUtils.replace("abaa", "a", null, -1) = "abaa"
* StringUtils.replace("abaa", "a", "", -1) = "b"
* StringUtils.replace("abaa", "a", "z", 0) = "abaa"
* StringUtils.replace("abaa", "a", "z", 1) = "zbaa"
* StringUtils.replace("abaa", "a", "z", 2) = "zbza"
* StringUtils.replace("abaa", "a", "z", -1) = "zbzz"
* </pre>
*
* @param text text to search and replace in, may be null
* @param searchString the String to search for, may be null
* @param replacement the String to replace it with, may be null
* @param max maximum number of values to replace, or {@code -1} if no maximum
* @return the text with any replacements processed,
* {@code null} if null String input
*/
public static String replace(String text, String searchString, String replacement, int max) {
if (isEmpty(text) || isEmpty(searchString) || replacement == null || max == 0) {
return text;
}
int start = 0;
int end = text.indexOf(searchString, start);
if (end == INDEX_NOT_FOUND) {
return text;
}
int replLength = searchString.length();
int increase = replacement.length() - replLength;
increase = (increase < 0 ? 0 : increase);
increase *= (max < 0 ? 16 : (max > 64 ? 64 : max));
StringBuilder buf = new StringBuilder(text.length() + increase);
while (end != INDEX_NOT_FOUND) {
buf.append(text.substring(start, end)).append(replacement);
start = end + replLength;
if (--max == 0) {
break;
}
end = text.indexOf(searchString, start);
}
buf.append(text.substring(start));
return buf.toString();
}
/**
* <p>
* Replaces all occurrences of Strings within another String.