com.crashnote.external.config.impl.AbstractConfigObject Maven / Gradle / Ivy
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/**
* Copyright (C) 2011-2012 Typesafe Inc.
*/
package com.crashnote.external.config.impl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import com.crashnote.external.config.ConfigException;
import com.crashnote.external.config.ConfigMergeable;
import com.crashnote.external.config.ConfigObject;
import com.crashnote.external.config.ConfigOrigin;
import com.crashnote.external.config.ConfigRenderOptions;
import com.crashnote.external.config.ConfigValue;
import com.crashnote.external.config.ConfigValueType;
abstract class AbstractConfigObject extends AbstractConfigValue implements ConfigObject {
final private SimpleConfig config;
protected AbstractConfigObject(final ConfigOrigin origin) {
super(origin);
this.config = new SimpleConfig(this);
}
@Override
public SimpleConfig toConfig() {
return config;
}
@Override
public AbstractConfigObject toFallbackValue() {
return this;
}
@Override
abstract public AbstractConfigObject withOnlyKey(String key);
@Override
abstract public AbstractConfigObject withoutKey(String key);
@Override
abstract public AbstractConfigObject withValue(String key, ConfigValue value);
abstract protected AbstractConfigObject withOnlyPathOrNull(Path path);
abstract AbstractConfigObject withOnlyPath(Path path);
abstract AbstractConfigObject withoutPath(Path path);
abstract AbstractConfigObject withValue(Path path, ConfigValue value);
/**
* This looks up the key with no transformation or type conversion of any
* kind, and returns null if the key is not present. The object must be
* resolved; use attemptPeekWithPartialResolve() if it is not.
*
* @param key
* @return the unmodified raw value or null
*/
protected final AbstractConfigValue peekAssumingResolved(final String key, final Path originalPath) {
try {
return attemptPeekWithPartialResolve(key);
} catch (ConfigException.NotResolved e) {
throw ConfigImpl.improveNotResolved(originalPath, e);
}
}
/**
* Look up the key on an only-partially-resolved object, with no
* transformation or type conversion of any kind; if 'this' is not resolved
* then try to look up the key anyway if possible.
*
* @param key
* key to look up
* @return the value of the key, or null if known not to exist
* @throws ConfigException.NotResolved
* if can't figure out key's value or can't know whether it
* exists
*/
protected abstract AbstractConfigValue attemptPeekWithPartialResolve(String key);
/**
* Looks up the path with no transformation, type conversion, or exceptions
* (just returns null if path not found). Does however resolve the path, if
* resolver != null.
*
* @throws NotPossibleToResolve
* if context is not null and resolution fails
*/
protected AbstractConfigValue peekPath(final Path path, final ResolveContext context) throws NotPossibleToResolve {
return peekPath(this, path, context);
}
/**
* Looks up the path. Doesn't do any resolution, will throw if any is
* needed.
*/
AbstractConfigValue peekPath(final Path path) {
try {
return peekPath(this, path, null);
} catch (NotPossibleToResolve e) {
throw new ConfigException.BugOrBroken(
"NotPossibleToResolve happened though we had no ResolveContext in peekPath");
}
}
// as a side effect, peekPath() will have to resolve all parents of the
// child being peeked, but NOT the child itself. Caller has to resolve
// the child itself if needed.
private static AbstractConfigValue peekPath(final AbstractConfigObject self, final Path path,
final ResolveContext context) throws NotPossibleToResolve {
try {
if (context != null) {
// walk down through the path resolving only things along that
// path, and then recursively call ourselves with no resolve
// context.
final AbstractConfigValue partiallyResolved = context.restrict(path).resolve(self);
if (partiallyResolved instanceof AbstractConfigObject) {
return peekPath((AbstractConfigObject) partiallyResolved, path, null);
} else {
throw new ConfigException.BugOrBroken("resolved object to non-object " + self
+ " to " + partiallyResolved);
}
} else {
// with no resolver, we'll fail if anything along the path can't
// be looked at without resolving.
final Path next = path.remainder();
final AbstractConfigValue v = self.attemptPeekWithPartialResolve(path.first());
if (next == null) {
return v;
} else {
if (v instanceof AbstractConfigObject) {
return peekPath((AbstractConfigObject) v, next, null);
} else {
return null;
}
}
}
} catch (ConfigException.NotResolved e) {
throw ConfigImpl.improveNotResolved(path, e);
}
}
@Override
public ConfigValueType valueType() {
return ConfigValueType.OBJECT;
}
protected abstract AbstractConfigObject newCopy(ResolveStatus status, ConfigOrigin origin);
@Override
protected AbstractConfigObject newCopy(final ConfigOrigin origin) {
return newCopy(resolveStatus(), origin);
}
@Override
protected AbstractConfigObject constructDelayedMerge(final ConfigOrigin origin,
final List stack) {
return new ConfigDelayedMergeObject(origin, stack);
}
@Override
protected abstract AbstractConfigObject mergedWithObject(AbstractConfigObject fallback);
@Override
public AbstractConfigObject withFallback(final ConfigMergeable mergeable) {
return (AbstractConfigObject) super.withFallback(mergeable);
}
static ConfigOrigin mergeOrigins(
final Collection stack) {
if (stack.isEmpty())
throw new ConfigException.BugOrBroken(
"can't merge origins on empty list");
final List origins = new ArrayList();
ConfigOrigin firstOrigin = null;
int numMerged = 0;
for (final AbstractConfigValue v : stack) {
if (firstOrigin == null)
firstOrigin = v.origin();
if (v instanceof AbstractConfigObject
&& ((AbstractConfigObject) v).resolveStatus() == ResolveStatus.RESOLVED
&& ((ConfigObject) v).isEmpty()) {
// don't include empty files or the .empty()
// config in the description, since they are
// likely to be "implementation details"
} else {
origins.add(v.origin());
numMerged += 1;
}
}
if (numMerged == 0) {
// the configs were all empty, so just use the first one
origins.add(firstOrigin);
}
return SimpleConfigOrigin.mergeOrigins(origins);
}
static ConfigOrigin mergeOrigins(final AbstractConfigObject... stack) {
return mergeOrigins(Arrays.asList(stack));
}
@Override
abstract AbstractConfigObject resolveSubstitutions(ResolveContext context) throws NotPossibleToResolve;
@Override
abstract AbstractConfigObject relativized(final Path prefix);
@Override
public abstract AbstractConfigValue get(Object key);
@Override
protected abstract void render(StringBuilder sb, int indent, ConfigRenderOptions options);
private static UnsupportedOperationException weAreImmutable(final String method) {
return new UnsupportedOperationException("ConfigObject is immutable, you can't call Map."
+ method);
}
@Override
public void clear() {
throw weAreImmutable("clear");
}
@Override
public ConfigValue put(final String arg0, final ConfigValue arg1) {
throw weAreImmutable("put");
}
@Override
public void putAll(final Map arg0) {
throw weAreImmutable("putAll");
}
@Override
public ConfigValue remove(final Object arg0) {
throw weAreImmutable("remove");
}
}
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