com.google.inject.ConfigurationException Maven / Gradle / Ivy

Go to download
package com.google.inject;

import com.google.common.collect.ImmutableSet;
import com.google.inject.internal.Messages;
import com.google.inject.spi.Message;

import java.util.Collection;

import static com.google.common.base.Preconditions.checkState;

/**
 * Thrown when a programming error such as a misplaced annotation, illegal binding, or unsupported
 * scope is found. Clients should catch this exception, log it, and stop execution.
 *
 */
@SuppressWarnings("serial")
public final class ConfigurationException extends RuntimeException {

    private final ImmutableSet messages;
    private Object partialValue = null;

    /**
     * Creates a ConfigurationException containing {@code messages}.
     */
    public ConfigurationException(Iterable messages) {
        this.messages = ImmutableSet.copyOf(messages);
        initCause(Messages.getOnlyCause(this.messages));
    }

    /**
     * Returns a copy of this configuration exception with the specified partial value.
     */
    public ConfigurationException withPartialValue(Object partialValue) {
        checkState(this.partialValue == null,
                "Can't clobber existing partial value %s with %s", this.partialValue, partialValue);
        ConfigurationException result = new ConfigurationException(messages);
        result.partialValue = partialValue;
        return result;
    }

    /**
     * Returns messages for the errors that caused this exception.
     */
    public Collection getErrorMessages() {
        return messages;
    }

    /**
     * Returns a value that was only partially computed due to this exception. The caller can use
     * this while collecting additional configuration problems.
     *
     * @return the partial value, or {@code null} if none was set. The type of the partial value is
     * specified by the throwing method.
     */
    @SuppressWarnings("unchecked") // this is *extremely* unsafe. We trust the caller here.
    public  E getPartialValue() {
        return (E) partialValue;
    }

    @Override
    public String getMessage() {
        return Messages.formatMessages("Guice configuration errors", messages);
    }
}