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API feature: Get minimum/maximum length of a possible match #14

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API feature: Get minimum/maximum length of a possible match #14

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35 changes: 35 additions & 0 deletions regex/src/main/java/com/florianingerl/util/regex/Pattern.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1543,6 +1543,41 @@ void setNext(Node a) {
*/
private transient boolean hasSupplementary;

/**
* The TreeInfo of the complete object tree.
*/
private transient volatile TreeInfo treeInfoRoot;

private TreeInfo getTreeInfoRoot() {
// double checked locking
TreeInfo treeInfo = treeInfoRoot;
if (treeInfo == null) {
synchronized (this) {
treeInfo = treeInfoRoot;
if (treeInfo == null) {
matchRoot.study(treeInfo = new TreeInfo());
treeInfoRoot = treeInfo;
}
}
}
return treeInfo;
}

/**
* @return The minimum length of a possible match.
*/
public int getMinLength() {
return getTreeInfoRoot().minLength;
}

/**
* @return The maximum length of a possible match or {@link Integer.MAX_VALUE} if there is no maximum.
*/
public int getMaxLength() {
TreeInfo treeInfo = getTreeInfoRoot();
return treeInfo.maxValid ? treeInfo.maxLength : Integer.MAX_VALUE;
}

/**
* Compiles the given regular expression into a pattern.
*
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