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package org.apache.camel.builder; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.Predicate; |
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import org.apache.camel.impl.BinaryPredicateSupport; |
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import org.apache.camel.impl.PredicateSupport; |
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import org.apache.camel.util.ObjectHelper; |
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import static org.apache.camel.util.ObjectHelper.compare; |
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import static org.apache.camel.util.ObjectHelper.notNull; |
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public class PredicateBuilder { |
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private PredicateBuilder() { |
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} |
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public static <E extends Exchange> Predicate<E> toPredicate(final Expression<E> expression) { |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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Object value = expression.evaluate(exchange); |
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return evaluateValuePredicate(value); |
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} |
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@Override |
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public String toString() { |
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return expression.toString(); |
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} |
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}; |
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} |
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public static boolean evaluateValuePredicate(Object value) { |
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if (value instanceof Boolean) { |
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Boolean aBoolean = (Boolean)value; |
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return aBoolean.booleanValue(); |
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} |
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return value != null; |
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} |
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public static <E extends Exchange> Predicate<E> not(final Predicate<E> predicate) { |
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notNull(predicate, "predicate"); |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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return !predicate.matches(exchange); |
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} |
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@Override |
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public String toString() { |
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return "not " + predicate; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> and(final Predicate<E> left, final Predicate<E> right) { |
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notNull(left, "left"); |
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notNull(right, "right"); |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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return left.matches(exchange) && right.matches(exchange); |
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} |
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@Override |
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public String toString() { |
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return "(" + left + ") and (" + right + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> or(final Predicate<E> left, final Predicate<E> right) { |
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notNull(left, "left"); |
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notNull(right, "right"); |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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return left.matches(exchange) || right.matches(exchange); |
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} |
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@Override |
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public String toString() { |
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return "(" + left + ") or (" + right + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isEqualTo(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return ObjectHelper.equals(leftValue, rightValue); |
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} |
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protected String getOperationText() { |
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return "=="; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isNotEqualTo(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return !ObjectHelper.equals(leftValue, rightValue); |
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} |
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protected String getOperationText() { |
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return "=="; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isLessThan(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return compare(leftValue, rightValue) < 0; |
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} |
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protected String getOperationText() { |
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return "<"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isLessThanOrEqualTo(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return compare(leftValue, rightValue) <= 0; |
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} |
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protected String getOperationText() { |
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return "<="; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isGreaterThan(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return compare(leftValue, rightValue) > 0; |
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} |
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protected String getOperationText() { |
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return ">"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isGreaterThanOrEqualTo(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return compare(leftValue, rightValue) < 0; |
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} |
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protected String getOperationText() { |
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return ">="; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> contains(final Expression<E> left, |
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final Expression<E> right) { |
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return new BinaryPredicateSupport<E>(left, right) { |
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protected boolean matches(E exchange, Object leftValue, Object rightValue) { |
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return ObjectHelper.contains(leftValue, rightValue); |
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} |
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protected String getOperationText() { |
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return "contains"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> isNull(final Expression<E> expression) { |
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return isEqualTo(expression, ExpressionBuilder.<E> constantExpression(null)); |
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} |
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public static <E extends Exchange> Predicate<E> isNotNull(final Expression<E> expression) { |
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return isNotEqualTo(expression, ExpressionBuilder.<E> constantExpression(null)); |
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} |
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public static <E extends Exchange> Predicate<E> isInstanceOf(final Expression<E> expression, |
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final Class type) { |
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notNull(expression, "expression"); |
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notNull(type, "type"); |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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Object value = expression.evaluate(exchange); |
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return type.isInstance(value); |
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} |
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@Override |
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public String toString() { |
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return expression + " instanceof " + type.getName(); |
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} |
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@Override |
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protected String assertionFailureMessage(E exchange) { |
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return super.assertionFailureMessage(exchange) + " for <" + expression.evaluate(exchange) |
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+ ">"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Predicate<E> regex(final Expression<E> expression, final String regex) { |
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return regex(expression, Pattern.compile(regex)); |
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} |
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public static <E extends Exchange> Predicate<E> regex(final Expression<E> expression, |
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final Pattern pattern) { |
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notNull(expression, "expression"); |
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notNull(pattern, "pattern"); |
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return new PredicateSupport<E>() { |
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public boolean matches(E exchange) { |
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Object value = expression.evaluate(exchange); |
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if (value != null) { |
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Matcher matcher = pattern.matcher(value.toString()); |
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return matcher.matches(); |
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} |
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return false; |
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} |
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@Override |
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public String toString() { |
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return expression + ".matches(" + pattern + ")"; |
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} |
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@Override |
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protected String assertionFailureMessage(E exchange) { |
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return super.assertionFailureMessage(exchange) + " for <" + expression.evaluate(exchange) |
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+ ">"; |
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} |
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}; |
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} |
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} |