org.apache.sling.api.resource.ResourceMetadata Maven / Gradle / Ivy
/*
* 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.sling.api.resource;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.NotNull;
/**
* The ResourceMetadata interface defines the API for the
* metadata of a Sling {@link Resource}. Essentially the resource's metadata is
* just a map of objects indexed by string keys.
*
* The actual contents of the meta data map is implementation specific with the
* exception of the {@link #RESOLUTION_PATH sling.resolutionPath} property which
* must be provided by all implementations and contain the part of the request
* URI used to resolve the resource. The type of this property value is defined
* to be String.
*
* Note, that the prefix sling. to key names is reserved for the
* Sling implementation.
*
* Once a resource is returned by the {@link ResourceResolver}, the resource
* metadata is made read-only and therefore can't be changed by client code!
*/
public class ResourceMetadata extends HashMap {
private static final long serialVersionUID = 4692666752269523738L;
/**
* The name of the required property providing the part of the request URI
* which was used to the resolve the resource to which the meta data
* instance belongs (value is "sling.resolutionPath").
*/
public static final String RESOLUTION_PATH = "sling.resolutionPath";
/**
* The name of the required property providing the part of the request URI
* which was not used to the resolve the resource to which the meta data
* instance belongs (value is "sling.resolutionPathInfo"). The value of this
* property concatenated to the value of the
* {@link #RESOLUTION_PATH sling.resolutionPath} property returns the
* original request URI leading to the resource.
*
* This property is optional. If missing, it should be assumed equal to an
* empty string.
*
* @since 2.0.4 (Sling API Bundle 2.0.4)
*/
public static final String RESOLUTION_PATH_INFO = "sling.resolutionPathInfo";
/**
* The name of the optional property providing the content type of the
* resource if the resource is streamable (value is "sling.contentType").
* This property may be missing if the resource is not streamable or if the
* content type is not known.
*/
public static final String CONTENT_TYPE = "sling.contentType";
/**
* The name of the optional property providing the content length of the
* resource if the resource is streamable (value is "sling.contentLength").
* This property may be missing if the resource is not streamable or if the
* content length is not known.
*
* Note, that unlike the other properties, this property may be set only
* after the resource has successfully been adapted to an
* InputStream for performance reasons.
*/
public static final String CONTENT_LENGTH = "sling.contentLength";
/**
* The name of the optional property providing the character encoding of the
* resource if the resource is streamable and contains character data (value
* is "sling.characterEncoding"). This property may be missing if the
* resource is not streamable or if the character encoding is not known.
*/
public static final String CHARACTER_ENCODING = "sling.characterEncoding";
/**
* Returns the creation time of this resource in the repository in
* milliseconds (value is "sling.creationTime"). The type of this property
* is java.lang.Long. The property may be missing if the
* resource is not streamable or if the creation time is not known.
*/
public static final String CREATION_TIME = "sling.creationTime";
/**
* Returns the last modification time of this resource in the repository in
* milliseconds (value is "sling.modificationTime"). The type of this
* property is java.lang.Long. The property may be missing
* if the resource is not streamable or if the last modification time is not
* known.
*/
public static final String MODIFICATION_TIME = "sling.modificationTime";
/**
* Returns whether the resource resolver should continue to search for a
* resource.
* A resource provider can set this flag to indicate that the resource
* resolver should search for a provider with a lower priority. If it
* finds a resource using such a provider, that resource is returned
* instead. If none is found this resource is returned.
* This flag should never be manipulated by application code!
* The value of this property has no meaning, the resource resolver
* just checks whether this flag is set or not.
* @since 2.2 (Sling API Bundle 2.2.0)
* @deprecated This flag is not supported anymore when implementing the SPI
* based {@code org.apache.sling.spi.resource.provider.ResourceProvider}
*/
public static final String INTERNAL_CONTINUE_RESOLVING = ":org.apache.sling.resource.internal.continue.resolving";
/**
* Returns a map containing parameters added to path after semicolon.
* For instance, map for path /content/test;v='1.2.3'.html
* will contain one entry key v and value 1.2.3.
*/
public static final String PARAMETER_MAP = "sling.parameterMap";
private boolean isReadOnly = false;
/**
* Sets the {@link #CHARACTER_ENCODING} property to encoding
* if not null.
* @param encoding The encoding
*/
public void setCharacterEncoding(String encoding) {
if (encoding != null) {
put(CHARACTER_ENCODING, encoding);
}
}
/**
* Returns the {@link #CHARACTER_ENCODING} property if not null
* and a String instance. Otherwise null is
* returned.
* @return The character encoding
*/
public @Nullable String getCharacterEncoding() {
Object value = get(CHARACTER_ENCODING);
if (value instanceof String) {
return (String) value;
}
return null;
}
/**
* Sets the {@link #CONTENT_TYPE} property to contentType if
* not null.
* @param contentType The content type
*/
public void setContentType(String contentType) {
if (contentType != null) {
put(CONTENT_TYPE, contentType);
}
}
/**
* Returns the {@link #CONTENT_TYPE} property if not null and
* a String instance. Otherwise null is
* returned.
* @return The content type
*/
public @Nullable String getContentType() {
Object value = get(CONTENT_TYPE);
if (value instanceof String) {
return (String) value;
}
return null;
}
/**
* Sets the {@link #CONTENT_LENGTH} property to contentType
* if not null.
* @param contentLength The content length
*/
public void setContentLength(long contentLength) {
if (contentLength > 0) {
put(CONTENT_LENGTH, contentLength);
}
}
/**
* Returns the {@link #CONTENT_LENGTH} property if not null
* and a long. Otherwise -1 is returned.
* @return The content length
*/
public long getContentLength() {
Object value = get(CONTENT_LENGTH);
if (value instanceof Long) {
return (Long) value;
}
return -1;
}
/**
* Sets the {@link #CREATION_TIME} property to creationTime
* if not negative.
* @param creationTime The creation time
*/
public void setCreationTime(long creationTime) {
if (creationTime >= 0) {
put(CREATION_TIME, creationTime);
}
}
/**
* Returns the {@link #CREATION_TIME} property if not null
* and a long. Otherwise -1 is returned.
* @return The creation time
*/
public long getCreationTime() {
Object value = get(CREATION_TIME);
if (value instanceof Long) {
return (Long) value;
}
return -1;
}
/**
* Sets the {@link #MODIFICATION_TIME} property to
* modificationTime if not negative.
* @param modificationTime The modification time
*/
public void setModificationTime(long modificationTime) {
if (modificationTime >= 0) {
put(MODIFICATION_TIME, modificationTime);
}
}
/**
* Returns the {@link #MODIFICATION_TIME} property if not null
* and a long. Otherwise -1 is returned.
* @return The modification time
*/
public long getModificationTime() {
Object value = get(MODIFICATION_TIME);
if (value instanceof Long) {
return (Long) value;
}
return -1;
}
/**
* Sets the {@link #RESOLUTION_PATH} property to resolutionPath
* if not null.
* @param resolutionPath The resolution path
*/
public void setResolutionPath(String resolutionPath) {
if (resolutionPath != null) {
put(RESOLUTION_PATH, resolutionPath);
}
}
/**
* Returns the {@link #RESOLUTION_PATH} property if not null
* and a String instance. Otherwise null is
* returned.
* @return The resolution path
*/
public @Nullable String getResolutionPath() {
Object value = get(RESOLUTION_PATH);
if (value instanceof String) {
return (String) value;
}
return null;
}
/**
* Sets the {@link #RESOLUTION_PATH_INFO} property to
* resolutionPathInfo if not null.
* @param resolutionPathInfo The resolution path info
*/
public void setResolutionPathInfo(String resolutionPathInfo) {
if (resolutionPathInfo != null) {
put(RESOLUTION_PATH_INFO, resolutionPathInfo);
}
}
/**
* Returns the {@link #RESOLUTION_PATH_INFO} property if not
* null and a String instance. Otherwise
* null is returned.
* @return The resolution path info
*/
public @Nullable String getResolutionPathInfo() {
Object value = get(RESOLUTION_PATH_INFO);
if (value instanceof String) {
return (String) value;
}
return null;
}
/**
* Sets the {@link #PARAMETER_MAP} property to
* parameterMap if not null.
* @param parameterMap The parameter map
*/
public void setParameterMap(Map parameterMap) {
if (parameterMap != null) {
if (parameterMap.isEmpty()) {
put(PARAMETER_MAP, Collections.emptyMap());
} else {
put(PARAMETER_MAP, new LinkedHashMap(parameterMap));
}
}
}
/**
* Returns the {@link #PARAMETER_MAP} property if not
* null and a Map instance. Otherwise
* null is returned.
* @return The parameter map
*/
@SuppressWarnings("unchecked")
public @Nullable Map getParameterMap() {
Object value = get(PARAMETER_MAP);
if (value instanceof Map) {
return (Map) value;
}
return null;
}
/**
* Make this object read-only. All method calls trying to modify this object
* result in an exception!
* @since 2.3 (Sling API Bundle 2.4.0)
*/
public void lock() {
this.isReadOnly = true;
}
/**
* Check if this object is read only and if so throw an unsupported operation exception.
*/
private void checkReadOnly() {
if ( this.isReadOnly ) {
throw new UnsupportedOperationException(getClass().getSimpleName() + " is locked");
}
}
@Override
public void clear() {
this.checkReadOnly();
super.clear();
}
@Override
public Object put(@NotNull final String key, final Object value) {
this.checkReadOnly();
return super.put(key, value);
}
@Override
public void putAll(@NotNull final Map m) {
this.checkReadOnly();
super.putAll(m);
}
@Override
public Object remove(@NotNull final Object key) {
this.checkReadOnly();
return super.remove(key);
}
protected void internalPut(@NotNull String key, Object value) {
super.put(key, value);
}
@Override
public Object clone() {
ResourceMetadata result = (ResourceMetadata) super.clone();
result.lockedEntrySet = null;
result.lockedKeySet = null;
result.lockedValues = null;
return result;
}
// volatile for correct double-checked locking in getLockedData()
private transient volatile Set> lockedEntrySet;
private transient Set lockedKeySet;
private transient Collection