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org.yaml.snakeyaml.serializer.Serializer Maven / Gradle / Ivy
/**
* Copyright (c) 2008, http://www.snakeyaml.org
*
* Licensed 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.yaml.snakeyaml.serializer;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.Version;
import org.yaml.snakeyaml.emitter.Emitable;
import org.yaml.snakeyaml.events.AliasEvent;
import org.yaml.snakeyaml.events.DocumentEndEvent;
import org.yaml.snakeyaml.events.DocumentStartEvent;
import org.yaml.snakeyaml.events.ImplicitTuple;
import org.yaml.snakeyaml.events.MappingEndEvent;
import org.yaml.snakeyaml.events.MappingStartEvent;
import org.yaml.snakeyaml.events.ScalarEvent;
import org.yaml.snakeyaml.events.SequenceEndEvent;
import org.yaml.snakeyaml.events.SequenceStartEvent;
import org.yaml.snakeyaml.events.StreamEndEvent;
import org.yaml.snakeyaml.events.StreamStartEvent;
import org.yaml.snakeyaml.nodes.AnchorNode;
import org.yaml.snakeyaml.nodes.CollectionNode;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeId;
import org.yaml.snakeyaml.nodes.NodeTuple;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.SequenceNode;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.resolver.Resolver;
public final class Serializer {
private final Emitable emitter;
private final Resolver resolver;
private boolean explicitStart;
private boolean explicitEnd;
private Version useVersion;
private Map useTags;
private Set serializedNodes;
private Map anchors;
private AnchorGenerator anchorGenerator;
private Boolean closed;
private Tag explicitRoot;
public Serializer(Emitable emitter, Resolver resolver, DumperOptions opts, Tag rootTag) {
this.emitter = emitter;
this.resolver = resolver;
this.explicitStart = opts.isExplicitStart();
this.explicitEnd = opts.isExplicitEnd();
if (opts.getVersion() != null) {
this.useVersion = opts.getVersion();
}
this.useTags = opts.getTags();
this.serializedNodes = new HashSet();
this.anchors = new HashMap();
this.anchorGenerator = opts.getAnchorGenerator();
this.closed = null;
this.explicitRoot = rootTag;
}
public void open() throws IOException {
if (closed == null) {
this.emitter.emit(new StreamStartEvent(null, null));
this.closed = Boolean.FALSE;
} else if (Boolean.TRUE.equals(closed)) {
throw new SerializerException("serializer is closed");
} else {
throw new SerializerException("serializer is already opened");
}
}
public void close() throws IOException {
if (closed == null) {
throw new SerializerException("serializer is not opened");
} else if (!Boolean.TRUE.equals(closed)) {
this.emitter.emit(new StreamEndEvent(null, null));
this.closed = Boolean.TRUE;
// release unused resources
this.serializedNodes.clear();
this.anchors.clear();
}
}
public void serialize(Node node) throws IOException {
if (closed == null) {
throw new SerializerException("serializer is not opened");
} else if (closed) {
throw new SerializerException("serializer is closed");
}
this.emitter.emit(new DocumentStartEvent(null, null, this.explicitStart, this.useVersion,
useTags));
anchorNode(node);
if (explicitRoot != null) {
node.setTag(explicitRoot);
}
serializeNode(node, null);
this.emitter.emit(new DocumentEndEvent(null, null, this.explicitEnd));
this.serializedNodes.clear();
this.anchors.clear();
}
private void anchorNode(Node node) {
if (node.getNodeId() == NodeId.anchor) {
node = ((AnchorNode) node).getRealNode();
}
if (this.anchors.containsKey(node)) {
String anchor = this.anchors.get(node);
if (null == anchor) {
anchor = this.anchorGenerator.nextAnchor(node);
this.anchors.put(node, anchor);
}
} else {
this.anchors.put(node, null);
switch (node.getNodeId()) {
case sequence:
SequenceNode seqNode = (SequenceNode) node;
List list = seqNode.getValue();
for (Node item : list) {
anchorNode(item);
}
break;
case mapping:
MappingNode mnode = (MappingNode) node;
List map = mnode.getValue();
for (NodeTuple object : map) {
Node key = object.getKeyNode();
Node value = object.getValueNode();
anchorNode(key);
anchorNode(value);
}
break;
}
}
}
//parent Node is not used but might be used in the future
private void serializeNode(Node node, Node parent) throws IOException {
if (node.getNodeId() == NodeId.anchor) {
node = ((AnchorNode) node).getRealNode();
}
String tAlias = this.anchors.get(node);
if (this.serializedNodes.contains(node)) {
this.emitter.emit(new AliasEvent(tAlias, null, null));
} else {
this.serializedNodes.add(node);
switch (node.getNodeId()) {
case scalar:
ScalarNode scalarNode = (ScalarNode) node;
Tag detectedTag = this.resolver.resolve(NodeId.scalar, scalarNode.getValue(), true);
Tag defaultTag = this.resolver.resolve(NodeId.scalar, scalarNode.getValue(), false);
ImplicitTuple tuple = new ImplicitTuple(node.getTag().equals(detectedTag), node
.getTag().equals(defaultTag));
ScalarEvent event = new ScalarEvent(tAlias, node.getTag().getValue(), tuple,
scalarNode.getValue(), null, null, scalarNode.getScalarStyle());
this.emitter.emit(event);
break;
case sequence:
SequenceNode seqNode = (SequenceNode) node;
boolean implicitS = node.getTag().equals(this.resolver.resolve(NodeId.sequence,
null, true));
this.emitter.emit(new SequenceStartEvent(tAlias, node.getTag().getValue(),
implicitS, null, null, seqNode.getFlowStyle()));
List list = seqNode.getValue();
for (Node item : list) {
serializeNode(item, node);
}
this.emitter.emit(new SequenceEndEvent(null, null));
break;
default:// instance of MappingNode
Tag implicitTag = this.resolver.resolve(NodeId.mapping, null, true);
boolean implicitM = node.getTag().equals(implicitTag);
this.emitter.emit(new MappingStartEvent(tAlias, node.getTag().getValue(),
implicitM, null, null, ((CollectionNode) node).getFlowStyle()));
MappingNode mnode = (MappingNode) node;
List map = mnode.getValue();
for (NodeTuple row : map) {
Node key = row.getKeyNode();
Node value = row.getValueNode();
serializeNode(key, mnode);
serializeNode(value, mnode);
}
this.emitter.emit(new MappingEndEvent(null, null));
}
}
}
}
