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Add RFC6901 json pointer support #67

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Add RFC6901 json pointer support #67

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95 changes: 92 additions & 3 deletions src/main/java/com/redislabs/modules/rejson/Path.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,13 +28,15 @@

package com.redislabs.modules.rejson;

import java.util.Objects;

/**
* Path is a ReJSON path, representing a valid path into an object
*/
public class Path {
public static final Path ROOT_PATH = new Path(".");
public static final Path ROOT_PATH = new Path(".");
private final String strPath;

public Path(final String strPath) {
Expand All @@ -60,6 +62,10 @@ public static Path of(final String strPath) {
return new Path(strPath);
}

public static Path ofJsonPointer(final String strPath) {
return new Path(parse(strPath));
}

@Override
public boolean equals(Object obj) {
if (obj == null) return false;
Expand All @@ -72,4 +78,87 @@ public boolean equals(Object obj) {
public int hashCode() {
return strPath.hashCode();
}

private static String parse(String path) {
Objects.requireNonNull(path, "Json Pointer Path cannot be null.");

if (path.isEmpty()) {
// "" means all document
return ROOT_PATH.toString();
}
if (path.charAt(0) != '/') {
throw new IllegalArgumentException("Json Pointer Path must start with '/'.");
}

final char[] ary = path.toCharArray();
StringBuilder result = new StringBuilder();
StringBuilder builder = new StringBuilder();
boolean number = true;
char prev = '/';
for (int i = 1; i < ary.length; i++) {
char c = ary[i];
switch (c) {
case '~':
if (prev == '~') {
number = false;
builder.append('~');
}
break;
case '/':
if (prev == '~') {
number = false;
builder.append('~');
}
if (builder.length() > 0 && number) {
result.append(".[").append(builder).append("]");
} else {
result.append(".[\"").append(builder).append("\"]");
}
number = true;
builder.setLength(0);
break;
case '0':
if (prev == '~') {
number = false;
builder.append("~");
} else {
builder.append(c);
}
break;
case '1':
if (prev == '~') {
number = false;
builder.append("/");
} else {
builder.append(c);
}
break;
default:
if (prev == '~') {
number = false;
builder.append('~');
}
if (c < '0' || c > '9') {
number = false;
}
builder.append(c);
break;
}
prev = c;
}
if (prev == '~') {
number = false;
builder.append("~");
}
if (builder.length() > 0) {
if (number) {
result.append(".[").append(builder).append("]");
} else {
result.append(".[\"").append(builder).append("\"]");
}
} else if (prev == '/') {
result.append(".[\"").append(builder).append("\"]");
}
return result.toString();
}
}
34 changes: 34 additions & 0 deletions src/test/java/com/redislabs/modules/rejson/PathTest.java
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Expand Up @@ -31,4 +31,38 @@ public void testPathHashCode() {
assertEquals(Path.of(".a.b.c").hashCode(), Path.of(".a.b.c").hashCode());
assertNotEquals(Path.of(".a.b.c").hashCode(), Path.of(".b.c").hashCode());
}

@Test
public void testJsonPointer() {
assertEquals(Path.ofJsonPointer(""), Path.ROOT_PATH);
assertEquals(Path.ofJsonPointer("/"), Path.of(".[\"\"]"));
assertEquals(Path.ofJsonPointer("//0"), Path.of(".[\"\"].[0]"));
assertEquals(Path.ofJsonPointer("//"), Path.of(".[\"\"].[\"\"]"));
assertEquals(Path.ofJsonPointer("// "), Path.of(".[\"\"].[\" \"]"));
assertEquals(Path.ofJsonPointer("/a/b/c"), Path.of(".[\"a\"].[\"b\"].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/a/0/c"), Path.of(".[\"a\"].[0].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/a/0b/c"), Path.of(".[\"a\"].[\"0b\"].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/ab/cd/1010"), Path.of(".[\"ab\"].[\"cd\"].[1010]"));
assertEquals(Path.ofJsonPointer("/a/b/c").hashCode(), Path.of(".[\"a\"].[\"b\"].[\"c\"]").hashCode());

// escape test
assertEquals(Path.ofJsonPointer("/a/~0"), Path.of(".[\"a\"].[\"~\"]"));
assertEquals(Path.ofJsonPointer("/a/~1"), Path.of(".[\"a\"].[\"/\"]"));
assertEquals(Path.ofJsonPointer("/a/~0/c"), Path.of(".[\"a\"].[\"~\"].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/a/~1/c"), Path.of(".[\"a\"].[\"/\"].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/a/~~/c"), Path.of(".[\"a\"].[\"~~\"].[\"c\"]"));
assertEquals(Path.ofJsonPointer("/~/~~~/~"), Path.of(".[\"~\"].[\"~~~\"].[\"~\"]"));
assertEquals(Path.ofJsonPointer("/~/~~~/~~"), Path.of(".[\"~\"].[\"~~~\"].[\"~~\"]"));
assertEquals(Path.ofJsonPointer("/~/~~~0/~~"), Path.of(".[\"~\"].[\"~~~\"].[\"~~\"]"));
assertEquals(Path.ofJsonPointer("/~/'.'/~~"), Path.of(".[\"~\"].[\"'.'\"].[\"~~\"]"));

// json path escape test
assertEquals(Path.ofJsonPointer("/\t"), Path.of(".[\"\t\"]"));
assertEquals(Path.ofJsonPointer("/\u0074"), Path.of(".[\"\u0074\"]"));
assertEquals(Path.ofJsonPointer("/'"), Path.of(".[\"'\"]"));
assertEquals(Path.ofJsonPointer("/\'"), Path.of(".[\"\'\"]"));
assertEquals(Path.ofJsonPointer("/\""), Path.of(".[\"\"\"]"));
assertEquals(Path.ofJsonPointer("/\n"), Path.of(".[\"\n\"]"));
assertEquals(Path.ofJsonPointer("/\\"), Path.of(".[\"\\\"]"));
}
}