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ExpressionResolverTest.java
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ExpressionResolverTest.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.placeholders;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.junit.Before;
import org.junit.Test;
/**
*
*/
public class ExpressionResolverTest {
private static final HeadersPlaceholder HEADERS_PLACEHOLDER = PlaceholderFactory.newHeadersPlaceholder();
private ExpressionResolver expressionResolver;
@Before
public void setupExpressionResolver() {
final Map<String, String> headersMap = new HashMap<>();
headersMap.put("header-name", "header-val");
headersMap.put("header:with:colon", "value:with:colon");
expressionResolver = PlaceholderFactory.newExpressionResolver(
PlaceholderFactory.newPlaceholderResolver(HEADERS_PLACEHOLDER, headersMap)
);
}
@Test
public void testPlaceholderFunctionDefaultWithConstant() {
assertThat(expressionResolver.resolve("{{ header:nonexistent | fn:default('fallback-val') }}"))
.contains("fallback-val");
}
@Test
public void testHeaderWithColon() {
assertThat(expressionResolver.resolve("{{ header:header:with:colon }}"))
.contains("value:with:colon");
}
@Test
public void testPlaceholderFunctionDefaultWithPlaceholder() {
assertThat(expressionResolver.resolve("{{ header:nonexistent | fn:default(header:header-name) }}"))
.contains("header-val");
}
@Test
public void testPlaceholderFunctionDefaultWithPlaceholderNonExistingDefault() {
assertThat(expressionResolver.resolve("{{ header:nonexistent | fn:default(header:alsoNotThere) }}"))
.isEmpty();
}
@Test
public void testPlaceholderFunctionSubstringBefore() {
assertThat(expressionResolver.resolve(
"{{ header:header:with:colon }}:{{header:header:with:colon| fn:substring-before(':') }}"))
.contains("value:with:colon:value");
}
@Test
public void testPlaceholderFunctionSubstringBeforeWithDefaultFallback() {
assertThat(expressionResolver.resolve(
"{{ header:header-name }}:{{header:header-name | fn:substring-before('_') | fn:default(header:header-name)}}"))
.contains("header-val:header-val");
}
@Test
public void testPlaceholderFunctionSubstringAfterWithUpper() {
assertThat(expressionResolver.resolve("{{ header:header:with:colon | fn:substring-after(':') | fn:upper() }}"))
.contains("WITH:COLON");
}
@Test
public void testLoneDelete() {
assertThat(expressionResolver.resolve("{{ fn:delete() }}"))
.isEqualTo(PipelineElement.deleted());
assertThat(expressionResolver.resolve("{{ fn:delete() }}{{ fn:delete() }}"))
.isEqualTo(PipelineElement.deleted());
assertThat(expressionResolver.resolve("{{ fn:delete() }}{{ fn:delete() }}{{ fn:delete() }}"))
.isEqualTo(PipelineElement.deleted());
assertThat(expressionResolver.resolve("{{ fn:default(fn:delete()) }}"))
.isEqualTo(PipelineElement.deleted());
}
@Test
public void testLoneDefault() {
assertThat(expressionResolver.resolve("{{ fn:default(header:header-name) }}"))
.contains("header-val");
}
@Test
public void testEmptyTemplate() {
assertThat(expressionResolver.resolve("")).isEqualTo(PipelineElement.resolved(""));
assertThat(expressionResolver.resolve(" ")).isEqualTo(PipelineElement.resolved(" "));
}
@Test
public void testPipelineStartingWithDefault() {
assertThat(expressionResolver.resolve("{{ fn:default(header:header-name) | fn:upper() }}"))
.contains("HEADER-VAL");
}
@Test
public void testDeleteIfUnresolved() {
assertThat(expressionResolver.resolve("{{ header:nonexistent }}"))
.isEqualTo(PipelineElement.unresolved());
assertThat(expressionResolver.resolve("{{ header:nonexistent | fn:default(fn:delete()) }}"))
.isEqualTo(PipelineElement.deleted());
assertThat(expressionResolver.resolve("{{ header:header-name | fn:delete() }}"))
.isEqualTo(PipelineElement.deleted());
}
@Test
public void testDeleteIfResolved() {
assertThat(expressionResolver.resolve("/{{ fn:delete() }}/{{ header:header-name }}/{{ fn:delete() }}/"))
.isEqualTo(PipelineElement.resolved("//header-val//"));
assertThat(expressionResolver.resolve("/{{ header:header-name | fn:delete() }}/{{ header:header-name }}/"))
.isEqualTo(PipelineElement.resolved("//header-val/"));
assertThat(expressionResolver.resolve("/{{ header:header-name }}/{{ header:header-name | fn:delete() }}/"))
.isEqualTo(PipelineElement.resolved("/header-val//"));
assertThat(expressionResolver.resolve("/{{ fn:delete() | fn:default(header:header-name) }}/{{ header:header-name | fn:delete() }}/"))
.isEqualTo(PipelineElement.resolved("///"));
}
@Test
public void testPartialResolution() {
assertThat(expressionResolver.resolvePartiallyAsPipelineElement("{{header:header-name}}-{{unknown:placeholder|fn:unknown}}",
Collections.singleton("header")))
.containsOnly("header-val-{{unknown:placeholder|fn:unknown}}");
}
@Test
public void testPartialResolutionWithForbiddenUnresolvedExpression() {
final Set<String> forbiddenUnresolvedExpressionPrefixes = Collections.singleton("unknown");
assertThatThrownBy(() ->
expressionResolver.resolvePartiallyAsPipelineElement(
"{{header:header-name}}-{{unknown:placeholder|fn:unknown}}",
forbiddenUnresolvedExpressionPrefixes
)
).isInstanceOf(UnresolvedPlaceholderException.class)
.withFailMessage("The placeholder 'unknown:placeholder' could not be resolved.")
.hasNoCause();
}
}