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Duncan MackinderDuncan Mackinder
Duncan Mackinder
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Duncan Mackinder
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Add ArrayValueMatcher, improve diagnostics
Add ArrayValueMatcher to simplify verification of range of array elements Improve diagnostics from RegularExpressionValueMatcher Remove RegularExpressionCustomization as it did not prove useful
1 parent 3851ea5 commit 6c00a7c

13 files changed

Lines changed: 471 additions & 213 deletions

‎src/main/java/org/skyscreamer/jsonassert/ArrayValueMatcher.java‎

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package org.skyscreamer.jsonassert;
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import java.text.MessageFormat;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.skyscreamer.jsonassert.comparator.JSONComparator;
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/**
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* A value matcher for arrays. This operates like STRICT_ORDER array match,
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* however if expected array has less elements than actual array the matching
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* process loops through the expected array to get expected elements for the
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* additional actual elements. In general the expected array will contain a
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* single element which is matched against each actual array element in turn.
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* This allows simple verification of constant array element components and
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* coupled with RegularExpressionValueMatcher can be used to match specific
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* array element components against a regular expression pattern. If the
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* expected object is not an array, a one element expected array is created
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* containing whatever is provided as the expected value.
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*
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* @author Duncan Mackinder
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*
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*/
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public class ArrayValueMatcher<T> implements LocationAwareValueMatcher<T> {
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private final JSONComparator comparator;
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private final int from;
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private final int to;
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/**
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* Create ArrayValueMatcher to match every element in actual array against
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* elements taken in sequence from expected array, repeating from start of
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* expected array if necessary.
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*
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* @param comparator
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* comparator to use to compare elements
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*/
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public ArrayValueMatcher(JSONComparator comparator) {
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this(comparator, 0, Integer.MAX_VALUE);
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}
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/**
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* Create ArrayValueMatcher to match specified element in actual array
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* against first element of expected array.
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*
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* @param comparator
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* comparator to use to compare elements
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*/
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public ArrayValueMatcher(JSONComparator comparator, int i) {
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this(comparator, i, i);
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}
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/**
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* Create ArrayValueMatcher to match every element in specified range
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* (inclusive) from actual array against elements taken in sequence from
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* expected array, repeating from start of expected array if necessary.
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*
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* @param comparator
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* comparator to use to compare elements
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* @from first element in actual array to compare
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* @to last element in actual array to compare
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*/
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public ArrayValueMatcher(JSONComparator comparator, int from, int to) {
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assert comparator != null : "comparator null";
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assert from >= 0 : MessageFormat.format("from({0}) < 0", from);
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assert to >= from : MessageFormat.format("to({0}) < from({1})", to,
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from);
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this.comparator = comparator;
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this.from = from;
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this.to = to;
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}
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@Override
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/*
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* NOTE: method defined as required by ValueMatcher interface but will never
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* be called so defined simply to indicate match failure
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*/
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public boolean equal(T o1, T o2) {
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return false;
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}
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@Override
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public boolean equal(String prefix, T actual, T expected, JSONCompareResult result) {
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if (!(actual instanceof JSONArray)) {
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throw new IllegalArgumentException("ArrayValueMatcher applied to non-array actual value");
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}
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try {
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JSONArray actualArray = (JSONArray) actual;
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JSONArray expectedArray = expected instanceof JSONArray ? (JSONArray) expected: new JSONArray(new Object[] { expected });
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int first = Math.max(0, from);
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int last = Math.min(actualArray.length() - 1, to);
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int expectedLen = expectedArray.length();
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for (int i = first; i <= last; i++) {
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String elementPrefix = MessageFormat.format("{0}[{1}]", prefix, i);
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Object actualElement = actualArray.get(i);
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Object expectedElement = expectedArray.get((i - first) % expectedLen);
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comparator.compareValues(elementPrefix, expectedElement, actualElement, result);
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}
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// values must match since no exceptions thrown
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return true;
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}
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catch (JSONException e) {
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return false;
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}
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}
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}

‎src/main/java/org/skyscreamer/jsonassert/Customizable.java‎

Lines changed: 0 additions & 16 deletions
This file was deleted.

‎src/main/java/org/skyscreamer/jsonassert/Customization.java‎

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/**
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* Associates a custom matcher to a specific jsonpath.
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*/
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public final class Customization implements Customizable {
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public final class Customization {
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private final String path;
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private final ValueMatcher<Object> comparator;
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@@ -14,23 +14,19 @@ public Customization(String path, ValueMatcher<Object> comparator) {
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this.comparator = comparator;
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}
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public static Customizable customization(String path, ValueMatcher<Object> comparator) {
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public static Customization customization(String path, ValueMatcher<Object> comparator) {
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return new Customization(path, comparator);
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}
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/* (non-Javadoc)
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* @see org.skyscreamer.jsonassert.Customizable#appliesToPath(java.lang.String)
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*/
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@Override
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public boolean appliesToPath(String path) {
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return this.path.equals(path);
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}
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/* (non-Javadoc)
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* @see org.skyscreamer.jsonassert.Customizable#matches(java.lang.Object, java.lang.Object)
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*/
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@Override
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public boolean matches(Object actual, Object expected) {
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return comparator.equal(actual, expected);
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}
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public boolean matches(String prefix, Object actual, Object expected,
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JSONCompareResult result) {
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if (comparator instanceof LocationAwareValueMatcher) {
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return ((LocationAwareValueMatcher<Object>)comparator).equal(prefix, actual, expected, result);
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}
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return comparator.equal(actual, expected);
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}
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}

‎src/main/java/org/skyscreamer/jsonassert/JSONCompareResult.java‎

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@@ -127,6 +127,16 @@ public JSONCompareResult fail(String field, Object expected, Object actual) {
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return this;
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}
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/**
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* Identify that the comparison failed
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* @param field Which field failed
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* @param exception exception containing details of match failure
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*/
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public JSONCompareResult fail(String field, ValueMatcherException exception) {
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fail(field + ": " + exception.getMessage(), exception.getExpected(), exception.getActual());
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return this;
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}
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private String formatFailureMessage(String field, Object expected, Object actual) {
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return field
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+ "\nExpected: "

‎src/main/java/org/skyscreamer/jsonassert/LocationAwareValueMatcher.java‎

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/**
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*
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*/
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package org.skyscreamer.jsonassert;
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/**
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* A ValueMatcher extension that provides location in form of prefix to the equals method.
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*
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* @author Duncan Mackinder
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*
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*/
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public interface LocationAwareValueMatcher<T> extends ValueMatcher<T> {
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boolean equal(String prefix, T actual, T expected, JSONCompareResult result);
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}

‎src/main/java/org/skyscreamer/jsonassert/RegularExpressionCustomization.java‎

Lines changed: 0 additions & 40 deletions
This file was deleted.

‎src/main/java/org/skyscreamer/jsonassert/RegularExpressionValueMatcher.java‎

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package org.skyscreamer.jsonassert;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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import org.skyscreamer.jsonassert.ValueMatcher;
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/**
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* A JSONassert value matcher that matches actual value to regular expression.
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* If non-null regular expression passed to constructor, then all actual values
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* will be compared against this pattern, ignoring any expected value passed to
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* equal method. If null regular expression passed to constructor, then expected
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* value passed to equals method will be treated as a regular expression.
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* will be compared against this constant pattern, ignoring any expected value
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* passed to equal method. If null regular expression passed to constructor,
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* then expected value passed to equals method will be used to dynamically
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* specify regular expression pattern that actual value must match.
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*
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* @author Duncan Mackinder
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*
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private final Pattern expectedPattern;
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/**
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* Create RegularExpressionValueMatcher in which the pattern the actual
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* value must match with be specified dynamically from the expected string
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* passed to this matcher in the equals method.
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*/
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public RegularExpressionValueMatcher() {
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this(null);
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}
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public RegularExpressionValueMatcher(String expected) {
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expectedPattern = expected == null ? null : Pattern.compile(expected);
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/**
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* Create RegularExpressionValueMatcher with specified pattern. If pattern
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* is not null, it must be a valid regular expression that defines a
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* constant expected pattern that every actual value must match (in this
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* case the expected value passed to equal method will be ignored). If
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* pattern is null, the pattern the actual value must match with be
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* specified dynamically from the expected string passed to this matcher in
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* the equals method.
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*
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* @param pattern
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* if non null, regular expression pattern which all actual
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* values this matcher is applied to must match. If null, this
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* matcher will apply pattern specified dynamically via the
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* expected parameter to the equal method.
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* @throws IllegalArgumentException
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* if pattern is non-null and not a valid regular expression.
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*/
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public RegularExpressionValueMatcher(String pattern) throws IllegalArgumentException {
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try {
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expectedPattern = pattern == null ? null : Pattern.compile(pattern);
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}
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catch (PatternSyntaxException e) {
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throw new IllegalArgumentException("Constant expected pattern invalid: " + e.getMessage(), e);
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}
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}
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@Override
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public boolean equal(T actual, T expected) {
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String actualString = actual.toString();
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Pattern pattern = expectedPattern != null ? expectedPattern : Pattern
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.compile(expected.toString());
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return pattern.matcher(actualString).matches();
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String expectedString = expected.toString();
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try {
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Pattern pattern = isStaticPattern() ? expectedPattern : Pattern
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.compile(expectedString);
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if (!pattern.matcher(actualString).matches()) {
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throw new ValueMatcherException(getPatternType() + " expected pattern did not match value", pattern.toString(), actualString);
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}
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}
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catch (PatternSyntaxException e) {
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throw new ValueMatcherException(getPatternType() + " expected pattern invalid: " + e.getMessage(), e, expectedString, actualString);
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}
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return true;
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}
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private boolean isStaticPattern() {
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return expectedPattern != null;
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}
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private String getPatternType() {
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return isStaticPattern()? "Constant": "Dynamic";
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}
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}

‎src/main/java/org/skyscreamer/jsonassert/ValueMatcherException.java‎

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package org.skyscreamer.jsonassert;
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/**
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* Exception that may be thrown by ValueMatcher subclasses to provide more detail on why matches method failed.
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*
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* @author Duncan Mackinder
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*
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*/
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public class ValueMatcherException extends RuntimeException {
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private static final long serialVersionUID = 1L;
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private final String expected;
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private final String actual;
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public ValueMatcherException(String message, String expected, String actual) {
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super(message);
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this.expected = expected;
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this.actual = actual;
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}
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public ValueMatcherException(Throwable cause, String expected, String actual) {
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super(cause);
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this.expected = expected;
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this.actual = actual;
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}
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public ValueMatcherException(String message, Throwable cause, String expected, String actual) {
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super(message, cause);
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this.expected = expected;
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this.actual = actual;
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}
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/**
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* @return the expected value
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*/
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public String getExpected() {
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return expected;
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}
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/**
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* @return the actual value
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*/
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public String getActual() {
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return actual;
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}
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}

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