| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.johnzon.core; |
| |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import jakarta.json.JsonArray; |
| import jakarta.json.JsonArrayBuilder; |
| import jakarta.json.JsonException; |
| import jakarta.json.JsonObject; |
| import jakarta.json.JsonObjectBuilder; |
| import jakarta.json.JsonPatch; |
| import jakarta.json.JsonPointer; |
| import jakarta.json.JsonStructure; |
| import jakarta.json.JsonValue; |
| import jakarta.json.spi.JsonProvider; |
| |
| import static java.util.Locale.ROOT; |
| |
| class JsonPatchImpl implements JsonPatch { |
| |
| private final JsonProvider provider; |
| private final List<PatchValue> patches; |
| |
| private volatile JsonArray json; |
| |
| JsonPatchImpl(final JsonProvider provider, final PatchValue... patches) { |
| this(provider, Arrays.asList(patches)); |
| } |
| |
| JsonPatchImpl(final JsonProvider provider, final List<PatchValue> patches) { |
| this.provider = provider; |
| if (patches == null) { |
| this.patches = Collections.emptyList(); |
| } else { |
| this.patches = Collections.unmodifiableList(patches); |
| } |
| } |
| |
| |
| @Override |
| public <T extends JsonStructure> T apply(T target) { |
| |
| //X TODO JsonPointer should use generics like JsonPatch |
| JsonStructure patched = target; |
| |
| for (PatchValue patch : patches) { |
| |
| switch (patch.operation) { |
| case ADD: |
| patched = patch.pathPointer.add(patched, patch.value); |
| break; |
| case REMOVE: |
| patched = patch.pathPointer.remove(patched); |
| break; |
| case REPLACE: |
| // first remove the existing element and then add the new value |
| patched = patch.pathPointer.add(patch.pathPointer.remove(patched), patch.value); |
| break; |
| case MOVE: |
| JsonValue valueToMove = patch.fromPointer.getValue(patched); |
| patched = patch.pathPointer.add(patch.fromPointer.remove(patched), valueToMove); |
| break; |
| case COPY: |
| JsonValue toCopy = patch.fromPointer.getValue(patched); |
| patched = patch.pathPointer.add(patched, toCopy); |
| break; |
| case TEST: |
| JsonValue toTest = patch.pathPointer.getValue(patched); |
| if (!toTest.equals(patch.value)) { |
| throw new JsonException("JsonPatch.Operation.TEST fails! Values are not equal"); |
| } |
| break; |
| default: |
| throw new IllegalStateException("unsupported operation: " + patch.operation); |
| } |
| } |
| |
| //X TODO dirty cast can be removed after JsonPointer uses generics like JsonPatch |
| return (T) patched; |
| } |
| |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| JsonPatchImpl jsonPatch = (JsonPatchImpl) o; |
| |
| return patches.equals(jsonPatch.patches); |
| } |
| |
| @Override |
| public int hashCode() { |
| return patches.hashCode(); |
| } |
| |
| |
| @Override |
| public JsonArray toJsonArray() { |
| if (patches.isEmpty()) { |
| return JsonValue.EMPTY_JSON_ARRAY; |
| } |
| if (json == null) { |
| synchronized (this) { |
| if (json == null) { |
| final JsonArrayBuilder builder = provider.createArrayBuilder(); |
| for (final PatchValue patch : patches) { |
| builder.add(patch.toJson()); |
| } |
| json = builder.build(); |
| } |
| } |
| } |
| return json; |
| } |
| |
| @Override |
| public String toString() { |
| if (patches.isEmpty()) { |
| return "[]"; |
| } |
| return toJsonArray().toString(); |
| } |
| |
| static class PatchValue { |
| private final JsonProvider provider; |
| private final JsonPatch.Operation operation; |
| private String path; |
| private String from; |
| private final JsonPointer pathPointer; |
| private final JsonPointer fromPointer; |
| private final JsonValue value; |
| |
| private volatile String str; |
| private volatile JsonObject json; |
| private volatile Integer hash; |
| |
| PatchValue(final JsonProvider provider, |
| final JsonPatch.Operation operation, |
| final String path, |
| final String from, |
| final JsonValue value) { |
| this.provider = provider; |
| this.operation = operation; |
| this.path = path; |
| this.from = from; |
| this.pathPointer = provider.createPointer(path); |
| |
| // ignore from if we do not need it |
| if (operation == JsonPatch.Operation.MOVE || operation == JsonPatch.Operation.COPY) { |
| this.fromPointer = provider.createPointer(from); |
| } else { |
| this.fromPointer = null; |
| } |
| |
| this.value = value; |
| } |
| |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| PatchValue that = (PatchValue) o; |
| |
| if (operation != that.operation) { |
| return false; |
| } |
| if (!path.equals(that.path)) { |
| return false; |
| } |
| if (from != null ? !from.equals(that.from) : that.from != null) { |
| return false; |
| } |
| return value != null ? value.equals(that.value) : that.value == null; |
| } |
| |
| @Override |
| public int hashCode() { |
| if (hash == null) { |
| synchronized (this) { |
| if (hash == null) { |
| int result = operation.hashCode(); |
| result = 31 * result + path.hashCode(); |
| result = 31 * result + (from != null ? from.hashCode() : 0); |
| result = 31 * result + (value != null ? value.hashCode() : 0); |
| hash = result; |
| } |
| } |
| } |
| return hash; |
| } |
| |
| |
| @Override |
| public String toString() { |
| if (str == null) { |
| synchronized (this) { |
| if (str == null) { |
| str = "{op: " + operation + ", path: " + |
| path + ", from: " + from + ", value: " + value + '}'; |
| } |
| } |
| } |
| return str; |
| } |
| |
| JsonObject toJson() { |
| if (json == null) { |
| synchronized (this) { |
| if (json == null) { |
| JsonObjectBuilder builder = provider.createObjectBuilder() |
| .add("op", operation.name().toLowerCase(ROOT)) |
| .add("path", path); |
| |
| if (fromPointer != null) { |
| builder.add("from", from); |
| } |
| |
| if (value != null) { |
| builder.add("value", value); |
| } |
| |
| json = builder.build(); |
| } |
| } |
| } |
| return json; |
| } |
| } |
| |
| } |