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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.common.value;

import com.sun.source.tree.Tree;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.ExecutableElement;
import org.checkerframework.javacutil.TreeUtils;

/** Stores methods that have special handling in the value checker. */
class ValueMethodIdentifier {

    /** String.length() method. */
    private final ExecutableElement lengthMethod;
    /** String.startsWith(String) method. */
    private final ExecutableElement startsWithMethod;
    /** String.endsWith(String) method. */
    private final ExecutableElement endsWithMethod;

    public ValueMethodIdentifier(ProcessingEnvironment processingEnv) {
        lengthMethod = TreeUtils.getMethod("java.lang.String", "length", 0, processingEnv);
        startsWithMethod = TreeUtils.getMethod("java.lang.String", "startsWith", 1, processingEnv);
        endsWithMethod = TreeUtils.getMethod("java.lang.String", "endsWith", 1, processingEnv);
    }

    /** Determines whether a tree is an invocation of the {@code String.length()} method. */
    public boolean isStringLengthInvocation(Tree tree, ProcessingEnvironment processingEnv) {
        return TreeUtils.isMethodInvocation(tree, lengthMethod, processingEnv);
    }

    /** Determines whether a method is the {@code String.length()} method. */
    public boolean isStringLengthMethod(ExecutableElement method) {
        // equals (rather than ElementUtils.ismethod) because String.length cannot be overridden
        return method.equals(lengthMethod);
    }

    /** Determines whether a method is the {@code String.startsWith(String)} method. */
    public boolean isStartsWithMethod(ExecutableElement method) {
        // equals (rather than ElementUtils.ismethod) because String.length cannot be overridden
        return method.equals(startsWithMethod);
    }
    /** Determines whether a method is the {@code String.endsWith(String)} method. */
    public boolean isEndsWithMethod(ExecutableElement method) {
        // equals (rather than ElementUtils.ismethod) because String.length cannot be overridden
        return method.equals(endsWithMethod);
    }
}